Updated on 2026/04/11

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写真a

 
Ruggero Micheletto
 
Organization
Graduate School of Nanobioscience Department of Materials System Science Professor
School of Science Department of Science
Title
Professor
Homepage
http://ruggero.sci.yokohama-cu.ac.jp
Profile
Ruggero Micheletto is a Professor in Yokohama City University, in the department of Nanosystem sciences, teaches Thermodynamics and introduction to quantum physics. He is also responsible for the courses of "Cognitive Science" to the Graduate School of Nanobioscience. His research interests are nano optics, sensing and Cognitive Science.
External link

Degree

  • Master (laurea) in Physics ( University of Torino, Italy )

  • PhD in Physics ( University of Bologna, Italy )

Research Interests

  • near-field optical microscopy

  • Cognitive Sciences

  • 表面プラズモン

  • 近接場走査型顕微鏡

  • Visual Perception

  • Perception

  • surface plasmon

Research Areas

  • Natural Science / Mathematical physics and fundamental theory of condensed matter physics

  • Natural Science / Semiconductors, optical properties of condensed matter and atomic physics

  • Life Science / Basic brain sciences  / Perception

Education

  • イタリア国ボロニア大学   物理学研究科   固体物質

    - 1992

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Research History

  • Yokohama City University International College of Arts and Sciences Materials Science Graduate School of Nanobioscience Department of Materials System Science   Professor

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Papers

  • Time and spatially resolved analysis of single quantum well InGaN/GaN photoluminescence blinking at multiple sample frequencies

    Kotaro Oikawa, Mitsuru Funato, Yoichi Kawakami, Ruggero Micheletto

    Current Applied Physics   79   7 - 13   2025.11

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    Publishing type：Research paper (scientific journal)   Publisher：Elsevier BV  

    DOI： 10.1016/j.cap.2025.07.003

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  • Comparison of the Spatial and Temporal Photoluminescence Dynamics in InGaN/GaN at 365 nm and 430 nm Excitation Reviewed

    Kotaro Oikawa, Ruggero Micheletto

    physica status solidi (b)   262 ( 12 )   2025.8

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    Publishing type：Research paper (scientific journal)   Publisher：Wiley  

    InGaN/GaN optical devices have emission wavelengths that cover the entire visible light range, depending on the indium composition ratio. However, a decrease in optical efficiency is known for high‐concentration indium samples (green luminescence). In these samples, luminescence is less uniform and photoluminescence instabilities (blinking) have also been reported. Although the luminescence mechanism of the blinking phenomenon has not yet been clarified, a qualitative explanation depicts the phenomenon related to the presence of dislocations. To examine these problems, this article reports how blinking change when stimulated at two different wavelengths, one that excites only the InGaN layer (442 nm), the other both (365 nm). In the case of simultaneous InGaN/GaN excitation, a larger number of blinking points are observed confirming several previous studies, whereas in the case of selective InGaN excitation, a noticeable photoluminescence uniformity and the reduction of blinking sites, in their size, contrast or even complete disappearance of them. This may be attributed to a simpler recombination process, where less traps and recombination pathways are available. On the contrary, the simultaneous excitation produces a complex recombination that uses intricate energy pathways through traps that are not involved by selective excitation. This results in a highly contrast of the photoluminescence and prominent localized blinking.

    DOI： 10.1002/pssb.202500146

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  • Correlated photoluminescence blinking phenomenon on InGaN/GaN nanopillar structures

    K. Oikawa, K. Okamoto, M. Funato, Y. Kawakami, R. Micheletto

    Applied Physics Letters   125 ( 24 )   2024.12

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    Light-emitting devices that take advantage of the wide bandgap characteristics of InGaN/GaN are widely used in the industry. However, inhomogeneities have been reported in their photoluminescence (PL) mapping at the nanometer and submicrometer scale, even in samples of high crystal quality. In addition, a blinking phenomenon (time variation of PL intensity) under photoexcitation has been reported in relation to these inhomogeneities. The reason why this blinking phenomenon occurs is still unclear; it has been observed in quantum dots and other single and multilayer quantum well structures. Nevertheless, there are very few publications on nanopillar InGaN quantum well samples, which are the focus of this research. Here, we report and analyze the behavior of the blinking phenomena on a nanopillar sample. We noticed that the blinking of the pillars is somehow synchronized on a long timescale among several spatially separated nanopillars. We demonstrated that the synchronization is not due to random intensity fluctuations. We suggest instead that the synchronization is caused by a nonlinear response of the quantum wells to the UV source. In other words, when the stimulation intensity surpasses a certain value, it triggers an ON/OFF state switch in the PL of some of the pillars. Even if preliminary, our study helps to provide clues to understanding the mechanism of the occurrence of the blink phenomenon.

    DOI： 10.1063/5.0234331

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  • An ab initio study of the electronic properties of helium in wurtzite gallium nitride

    Giovanni Alfieri, Yusuke Fujii, Ruggero Micheletto

    Semiconductor Science and Technology   2023.7

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    DOI： 10.1088/1361-6641/acd574

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  • Neural and axonal heterogeneity improves information transmission

    Salustri Marcello, Yoshida Shunra, Micheletto Ruggero

    Physica A: Statistical Mechanics and its Applications   618   2023.5

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.physa.2023.128627

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  • Time-correlated luminescence blinking in InGaN single quantum wells

    Shunra Yoshida, Yusuke Fujii, Giovanni Alfieri, Ruggero Micheletto

    Applied Physics Letters   2023.4

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1063/5.0141497

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  • Heterogeneous Axonal Delay Improves the Spiking Activity Propagation on a Toroidal Network.

    Marcello Salustri, Ruggero Micheletto

    Cognitive Computation   15 ( 4 )   1231 - 1242   2023

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1007/s12559-022-10034-2

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  • The influence of water and ethanol adsorption on the optical blinking in InGaN quantum wells

    Shunra Yoshida, Yusuke Fujii, Giovanni Alfieri, Ruggero Micheletto

    Semiconductor Science and Technology   2022.9

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1088/1361-6641/ac8309

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  • Hiding the Rabbit: Using a genetic algorithm to investigate shape guidance in visual search. International journal

    Avi M Aizenman, Krista A Ehinger, Farahnaz A Wick, Ruggero Micheletto, Jungyeon Park, Lucas Jurgensen, Jeremy M Wolfe

    Journal of vision   22 ( 1 )   7 - 7   2022.1

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    During visual search, attention is guided by specific features, including shape. Our understanding of shape guidance is limited to specific attributes (closures and line terminations) that do not fully explain the richness of preattentive shape processing. We used a novel genetic algorithm method to explore shape space and to stimulate hypotheses about shape guidance. Initially, observers searched for targets among 12 random distractors defined, in radial frequency space, by the amplitude and phase of 10 radial frequencies. Reaction time (RT) was the measure of "fitness." To evolve toward an easier search task, distractors with faster RTs survived to the next generation, "mated," and produced offspring (new distractors for the next generation of search). To evolve a harder search, surviving distractors were those yielding longer RTs. Within eight generations of evolution, the method succeeds in producing visual searches either harder or easier than the starting search. In radial frequency space, easy distractors evolve amplitude × frequency spectra that are dissimilar to the target, whereas hard distractors evolve spectra that are more similar to the target. This method also works with naturally shaped targets (e.g., rabbit silhouettes). Interestingly, the most inefficient distractors featured a combination of a body and ear distractors that did not resemble the rabbit (visually or in spectrum). Adding extra ears to these distractors did not impact the search spectrally and instead made it easier to confirm a rabbit, once it was found. In general, these experiments show that shapes that are clearly distinct when attended are similar to each other preattentively.

    DOI： 10.1167/jov.22.1.7

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  • Data augmentation for Convolutional LSTM based brain computer interface system.

    Kahoko Takahashi, Zhe Sun, Jordi Solé-Casals, Andrzej Cichocki, Anh Huy Phan 0001, Qibin Zhao, Hui-Hai Zhao, Shangkun Deng, Ruggero Micheletto

    Applied Soft Computing   122   108811 - 108811   2022

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    Publishing type：Research paper (scientific journal)  

    DOI： 10.1016/j.asoc.2022.108811

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    Other Link： https://dblp.uni-trier.de/db/journals/asc/asc122.html#TakahashiSSCPZZ22

  • Deep levels in ion implanted n-type homoepitaxial GaN: Ion mass, tilt angle and dose dependence

    G. Alfieri, V. K. Sundaramoorthy, R. Micheletto

    Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms   490   39 - 42   2021.3

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    DOI： 10.1016/j.nimb.2020.12.010

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  • The Electronic Properties of Chlorine in GaN: An Ab Initio Study

    Yusuke Fujii, Ruggero Micheletto, Giovanni Alfieri

    Physica Status Solidi (B) Basic Research   258 ( 2 )   2021.2

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  • Using a Hierarchical Temporal Memory Cortical Algorithm to Detect Seismic Signals in Noise

    Ruggero Micheletto, Kahoko Takahashi, Ahyi Kim

    INTELLIGENT COMPUTING, VOL 1   858   855 - 863   2019

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    Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1007/978-3-030-01174-1_67

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  • Simulation of the song motor pathway in birds: A single neuron initiates a chain of events that produces birdsong with realistic spectra properties Reviewed

    Giordani Cristiano, Rivera-Gutierrez Hector, Zhe Sun, Micheletto Ruggero

    PLOS ONE   13 ( 10 )   2018.10

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    DOI： 10.1371/journal.pone.0200998

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  • Electrically active point defects in Mg implanted n-type GaN grown by metal-organic chemical vapor deposition Reviewed

    G. Alfieri, V. K. Sundaramoorthy, R. Micheletto

    Journal of Applied Physics   123 ( 20 )   2018.5

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：American Institute of Physics Inc.  

    DOI： 10.1063/1.5029254

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  • Surface exciton polaritons supported by a J-aggregate-dye/air interface at room temperature Reviewed

    Kentaro Takatori, Takayuki Okamoto, Koji Ishibashi, Ruggero Micheletto

    OPTICS LETTERS   42 ( 19 )   3876 - 3879   2017.10

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  • Near-field surface plasmon field enhancement induced by rippled surfaces Reviewed

    Mario D'Acunto, Francesco Fuso, Ruggero Micheletto, Makoto Naruse, Francesco Tantussi, Maria Allegrini

    BEILSTEIN JOURNAL OF NANOTECHNOLOGY   8 ( 1 )   956 - 967   2017.4

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.3762/bjnano.8.97

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  • Surface-plasmon-induced broadband light absorbers Reviewed

    Kentaro Takatori, Takayuki Nishino, Takayuki Okamoto, Hiroyuki Takei, Ruggero Micheletto, Koji Ishibashi

    Optics InfoBase Conference Papers   2017   2017

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    Language：English   Publishing type：Research paper (international conference proceedings)   Publisher：OSA - The Optical Society  

    DOI： 10.1364/PV.2017.JW5A.25

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  • Resonances and Spectral Characteristics of a Neural Network for the Song Motor Pathway in Birds Reviewed

    Cristiano Giordani, Hector Fabio Rivera-Gutierrez, Ruggero Micheletto

    BIOPHYSICAL JOURNAL   110 ( 3 )   631A - 631A   2016.2

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  • Application of DNA adductomics to soil bacterium Sphingobium sp. strain KK22 Reviewed

    Robert A. Kanaly, Ruggero Micheletto, Tomonari Matsuda, Youko Utsuno, Yasuhiro Ozeki, Natsuko Hamamura

    MicrobiologyOpen   4 ( 5 )   841 - 856   2015.10

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Blackwell Publishing Ltd  

    Toward the development of ecotoxicology methods to investigate microbial markers of impacts of hydrocarbon processing activities, DNA adductomic analyses were conducted on a sphingomonad soil bacterium. From growing cells that were exposed or unexposed to acrolein, a commonly used biocide in hydraulic fracturing processes, DNA was extracted, digested to 2′-deoxynucleosides and analyzed by liquid chromatography-positive ionization electrospray-tandem mass spectrometry in selected reaction monitoring mode transmitting the [M + H]+ &gt
    [M + H - 116]+ transition over 100 transitions. Overall data shown as DNA adductome maps revealed numerous putative DNA adducts under both conditions with some occurring specifically for each condition. Adductomic analyses of triplicate samples indicated that elevated levels of some targeted putative adducts occurred in exposed cells. Two exposure-specific adducts were identified in exposed cells as 3-(2′-deoxyribosyl)-5,6,7,8-tetrahydro-6-hydroxy-(and 8-hydroxy-)pyrimido[1,2-a]- purine-(3H)-one (6- and 8-hydroxy-PdG) following synthesis of authentic standards of these compounds and subsequent analyses. A time course experiment showed that 6- and 8-hydroxy-PdG were detected in bacterial DNA within 30 min of acrolein exposure but were not detected in unexposed cells. This work demonstrated the first application of DNA adductomics to examine DNA damage in a bacterium and sets a foundation for future work.

    DOI： 10.1002/mbo3.283

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  • Application of DNA adductomics to soil bacterium Sphingobium sp. strain KK22. Reviewed

    Kanaly RA, Micheletto R, Matsuda T, Utsuno Y, Ozeki Y, Hamamura N

    Microbiologyopen   4 ( 5 )   841 - 856   2015.8

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  • Electronic properties of substitutional impurities in InGaN monolayer quantum wells

    G. Alfieri, T. Tsutsumi, R. Micheletto

    APPLIED PHYSICS LETTERS   106 ( 19 )   2015.5

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1063/1.4919787

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  • Blinking in Photoluminescence of InGaN Devices is Caused by Slow Beating of THz Vibrations of the Quantum Well Reviewed

    Ruggero Micheletto, Kotaro Oikawa, Christian Feldmeier

    ENGINEERING AND MANUFACTURING TECHNOLOGIES   541-542   253 - 257   2014

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    Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.4028/www.scientific.net/AMM.541-542.253

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  • Observation of lattice thermal waves interference by photoluminescence blinking of InGaN quantum well devices Reviewed

    R. Micheletto, K. Oikawa, C. Feldmeier

    APPLIED PHYSICS LETTERS   103 ( 17 )   2013.10

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1063/1.4826088

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  • A Fast and Precise HOG-Adaboost Based Visual Support System Capable to Recognize Pedestrian and Estimate Their Distance Reviewed

    Kishino Takahisa, Zhe Sun, Ruggero Micheletto

    NEW TRENDS IN IMAGE ANALYSIS AND PROCESSING - ICIAP 2013   8158   20 - 29   2013

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    Language：English   Publishing type：Research paper (international conference proceedings)  

    DOI： 10.1007/978-3-642-41190-8_3

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  • The Hangulphabet: A Descriptive Alphabet Reviewed

    Robert Bishop Jr, Ruggero Micheletto

    CoRR   abs/1210.7282   2012

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  • Real-time near-field evidence of optical blinking in the photoluminescence of inGaN by scanning near-field optical microscope

    Kotaro Oikawa, Christian Feldmeier, Ulrich Theodor Schwarz, Yoichi Kawakami, Ruggero Micheletto

    Optical Materials Express   1 ( 2 )   158 - 163   2011.6

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1364/OME.1.000158

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  • Transient memory effect in the photoluminescence of InGaN single quantum wells Reviewed

    Christian Feldmeier, Masayoshi Abiko, Ulrich T. Schwarz, Yoichi Kawakami, Ruggero Micheletto

    OPTICS EXPRESS   17 ( 25 )   22855 - 22860   2009.12

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1364/OE.17.022855

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  • Near-field evidence of local polarized emission centers in InGaN/GaN materials Reviewed

    Ruggero Micheletto, Maria Allegrini, Yoichi Kawakami

    APPLIED PHYSICS LETTERS   95 ( 21 )   211904   2009.11

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1063/1.3265732

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  • Tenfold improved sensitivity using high refractive-index substrates for surface plasmon sensing

    Ruggero Micheletto, Katsumi Hamamoto, Takashi Fujii, Yoichi Kawakami

    APPLIED PHYSICS LETTERS   93 ( 17 )   174104   2008.10

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1063/1.3005584

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  • A polarization-modulation method for the near-field mapping of laterally grown InGaN samples Reviewed

    Ruggero Micheletto, Daisuke Yamada, Maria Allegrini, Yoichi Kawakami

    OPTICS EXPRESS   16 ( 10 )   6889 - 6895   2008.5

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1364/OE.16.006889

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  • Optical nanometer-scale sensing of mechanical vibrations with a planar glass at critical angle

    Ruggero Micheletto, Yoichi Kawakami, Katsumi Hamamoto

    APPLIED PHYSICS LETTERS   90 ( 24 )   244108   2007.6

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    DOI： 10.1063/1.2747676

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  • Artefacts in polarization modulation scanning near-field optical microscopes

    R. Micheletto, M. Allegrini, Yoichi Kawakami

    JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS   9 ( 5 )   431 - 434   2007.5

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1088/1464-4258/9/5/001

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  • Acoustical nanometre-scale vibrations of live cells detected by a near-field optical setup

    Rosaria Piga, Ruggero Micheletto, Yoichi Kawakami

    Optics Express   15 ( 9 )   5589 - 5594   2007.4

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：Optical Society of American (OSA)  

    The Scanning Near-field Optical Microscope (SNOM) is able to detect tiny vertical movement on the cell membrane in the range of only 1 nanometer or less, about 3 orders of magnitude better than conventional optical microscopes. Here we show intriguing data of cell membrane nanometer-scale dynamics associated to different phenomena of the cell's life, such as cell cycle and cell death, on rat pheochromocytoma line PC12. Working in culture medium with alive and unperturbed samples, we could detect nanometer-sized movements
    Fourier components revealed a clear distinct behavior associated to regulation of neurite outgrowth and changes on morphology after necrotic stimulus. © 2007 Optical Society of America.

    DOI： 10.1364/OE.15.005589

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  • Acoustical nanometre-scale vibrations of live cells detected by a near-field optical setup Reviewed

    Rosaria Piga, Ruggero Micheletto, Yoichi Kawakami

    OPTICS EXPRESS   15 ( 9 )   5589 - 5594   2007.4

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    Language：English   Publishing type：Research paper (scientific journal)   Publisher：OPTICAL SOC AMER  

    The Scanning Near-field Optical Microscope ( SNOM) is able to detect tiny vertical movement on the cell membrane in the range of only 1 nanometer or less, about 3 orders of magnitude better than conventional optical microscopes. Here we show intriguing data of cell membrane nanometer-scale dynamics associated to different phenomena of the cell's life, such as cell cycle and cell death, on rat pheochromocytoma line PC12. Working in culture medium with alive and unperturbed samples, we could detect nanometer-sized movements; Fourier components revealed a clear distinct behavior associated to regulation of neurite outgrowth and changes on morphology after necrotic stimulus. (c) 2007 Optical Society of America.

    DOI： 10.1364/OE.15.005589

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  • Dichroism of diamond grains by a polarization modulated near field optical setup

    Ruggero Micheletto, Yoichi Kawakami, Claudio Manfredotti, Yiuri Garino, Maria Allegrini

    APPLIED PHYSICS LETTERS   89 ( 12 )   121125-121125-3   2006.9

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    DOI： 10.1063/1.2338581

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  • Observation of a nanometer size confined transient phenomenon. at the gold STM tip interface under UV illumination

    R Micheletto, M Yokokawa, Y Ding, D Hobara, T Kakiuchi, Y Kawakami

    COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS   273 ( 1-3 )   189 - 192   2006.2

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    DOI： 10.1016/j.colsurfa.2005.08.021

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  • Observation of optical instabilities in the photoluminescence of InGaN single quantum well

    R Micheletto, M Abiko, A Kaneta, Y Kawakami, Y Narukawa, T Mukai

    APPLIED PHYSICS LETTERS   88 ( 6 )   061118-061118-3   2006.2

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1063/1.2172144

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  • Index-of-refraction sensors: virtually unlimited sensing power at the critical angle Reviewed

    R Micheletto, Y Kawakami, K Hamamoto, S Kawai

    OPTICS LETTERS   31 ( 2 )   205 - 207   2006.1

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1364/OL.31.000205

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  • Fabrication of an atomic resolution low cost STM-SNOM hybrid probe Reviewed

    R Micheletto, M Yokokawa, S Okazakaki, Y Kawakami

    JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY   6 ( 1 )   72 - 76   2006.1

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1166/jnn.2006.109

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  • Nano-probing of the membrane dynamics of rat pheochromocytoma by near-field optics Reviewed

    R Piga, R Micheletto, Y Kawakami

    BIOPHYSICAL CHEMISTRY   117 ( 2 )   141 - 146   2005.9

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    DOI： 10.1016/j.bpc.2005.04.018

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  • Biological imaging with a near-field optical setup Reviewed

    M Denyer, R Micheletto, K Nakajima, M Hara, S Okazaki

    JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY   3 ( 6 )   496 - 502   2003.12

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    DOI： 10.1166/jnn.2003.202

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  • Near field optics: Principles and applications to nano materials Reviewed

    R Micheletto, K Nakajima, M Hara, W Knoll, H Sasabe

    HYPER-STRUCTURED MOLECULES II : CHEMISTRY, PHYSICS AND APPLICATIONS   215 - 233   2001

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  • Observation of the dynamics of live cardiomyocytes through a free-running scanning near-field optical microscopy setup Reviewed

    R Micheletto, M Denyer, M Scholl, K Nakajima, A Offenhauser, M Hara, W Knoll

    APPLIED OPTICS   38 ( 31 )   6648 - 6652   1999.11

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  • Near-field optical imaging of flagellar filaments of salmonella in water with optical feedback control Reviewed

    M. Naya, R. Micheletto, S. Mononobe, R. Uma Maheswari, M. Ohtsu

    Applied Optics   36 ( 7 )   1681 - 1683   1997.3

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    Language：English   Publishing type：Research paper (scientific journal)  

    DOI： 10.1364/AO.36.001681

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Books

  • 英語と日本語で学ぶ知覚情報科学

    Micheletto, Ruggero, 戸坂, 亜希, 及川, 虎太郎

    共立出版  2020.5  （ ISBN:9784320124608 ）

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  • Thermodynamics in English and Japanese

    Ruggero Micheletto, Aki Tosaka（ Role： Sole author）

    Kyoritushuppan  2015.11  （ ISBN:9784320035959 ）

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  • Applied Scanning probe methods II: Scanning Probe Microscopy Techniques (nanoscience and nanotechnology)

    Springer  2005  （ ISBN:3540262423 ）

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  • State-of-the-Art Program on Compound Semiconductors XLI and Nitride and Wide Bandgap Semiconductors for Sensors, Photonics, and Electronics V

    ECS  2004  （ ISBN:1566774195 ）

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  • Hyper-Structured Molecules III

    Hiroyuki Sasabe

    CRC Press  2001.11  （ ISBN:041526796X ）

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    Total pages：224  

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MISC

  • Visual search using VR environment and mathematical analysis of eye-gaze tracking data

    平井亮, ルジェロ ミケレット

    Vision   33 ( 1 )   2021

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  • Empirical mode decomposition for improved EEG signal classification with Convolutional Neural Network in Brain-Computer interface experiments

    TAKAHASHI Kahoko, SUN Zhe, SOL-CASALS Jordi, CICHOCKI Andrzej, PHAN Anh Huy, MICHELETTO Ruggero

    日本神経回路学会全国大会講演論文集   28th   2018

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  • 錯視による空間及び速度認知における知覚変化

    今野和紀, ミケレット ルジェロ

    Vision   30 ( 3 )   2018

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  • An HTM based cortical algorithm for detection of seismic waves

    Ruggero Micheletto, Ahyi Kim

    CoRR   abs/1707.01642   2017.7

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    Publishing type：Internal/External technical report, pre-print, etc.  

    Recognizing seismic waves immediately is very important for the realization<br />
    of efficient disaster prevention. Generally these systems consist of a network<br />
    of seismic detectors that send real time data to a central server. The server<br />
    elaborates the data and attempts to recognize the first signs of an earthquake.<br />
    The current problem with this approach is that it is subject to false alarms. A<br />
    critical trade-off exists between sensitivity of the system and error rate. To<br />
    overcame this problems, an artificial neural network based intelligent learning<br />
    systems can be used. However, conventional supervised ANN systems are difficult<br />
    to train, CPU intensive and prone to false alarms. To surpass these problems,<br />
    here we attempt to use a next-generation unsupervised cortical algorithm HTM.<br />
    This novel approach does not learn particular waveforms, but adapts to<br />
    continuously fed data reaching the ability to discriminate between normality<br />
    (seismic sensor background noise in no-earthquake conditions) and anomaly<br />
    (sensor response to a jitter or an earthquake). Main goal of this study is test<br />
    the ability of the HTM algorithm to be used to signal earthquakes automatically<br />
    in a feasible disaster prevention system. We describe the methodology used and<br />
    give the first qualitative assessments of the recognition ability of the<br />
    system. Our preliminary results show that the cortical algorithm used is very<br />
    robust to noise and that can successfully recognize synthetic earthquake-like<br />
    signals efficiently and reliably.

    arXiv

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  • Cross-modal codification of images with auditory stimuli: a language for the visually impaired

    Takahisa Kishino, Sun Zhe, Roberto Marchisio, Ruggero Micheletto

    2017.5

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    In this study we describe a methodology to realize visual images cognition in
    the broader sense, by a cross-modal stimulation through the auditory channel.
    An original algorithm of conversion from bi-dimensional images to sounds has
    been established and tested on several subjects. Our results show that subjects
    where able to discriminate with a precision of 95\% different sounds
    corresponding to different test geometric shapes. Moreover, after brief
    learning sessions on simple images, subjects where able to recognize among a
    group of 16 complex and never-trained images a single target by hearing its
    acoustical counterpart. Rate of recognition was found to depend on image
    characteristics, in 90% of the cases, subjects did better than choosing at
    random. This study contribute to the understanding of cross-modal perception
    and help for the realization of systems that use acoustical signals to help
    visually impaired persons to recognize objects and improve navigation

    arXiv

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    Other Link： http://arxiv.org/pdf/1705.05074v1

  • The relation between photoluminescence properties and gas pressure with [0001] InGaN single quantum well systems

    Toshiaki Tsutsumi, Giovanni Alfieri, Yoichi Kawakami, Ruggero Micheletto

    APPLIED SURFACE SCIENCE   392   256 - 259   2017.1

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  • ニューラルネットワークを用いた低SN比条件下における地震波検出法の開発

    高橋馨子, 松本裕也, 上松大輝, MICHELETTO Ruggero, KIM Ahyi, SUN Zhe

    日本地震学会秋季大会講演予稿集(CD-ROM)   2017   2017

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  • Noise influence on spike activation in a Hindmarsh-Rose small-world neural network

    Sun Zhe, Ruggero Micheletto

    JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL   49 ( 28 )   2016.7

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  • Indium-free organic thin-film solar cells using a plasmonic electrode

    Kentaro Takatori, Takayuki Nishino, Takayuki Okamoto, Hiroyuki Takei, Koji Ishibashi, Ruggero Micheletto

    JOURNAL OF PHYSICS D-APPLIED PHYSICS   49 ( 18 )   2016.5

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  • Non-linear and threshold effects of synaptic connectivity on the correlation parameter of a system of two coupled neurons

    Sun Zhe, Ruggero Micheletto

    Nonlinear Phenomena in Complex Systems   19 ( 2 )   122 - 134   2016.1

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  • Study on the Influence of Connection Strength on the Pacemaker in Coupled Neurons

    Sun Zhe, Ruggero Micheletto

    2015 54TH ANNUAL CONFERENCE OF THE SOCIETY OF INSTRUMENT AND CONTROL ENGINEERS OF JAPAN (SICE)   325 - 330   2015

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  • 20aSB-1 大型低温重力波望遠鏡(KAGRA)プロジェクトの現状(20aSB 重力波(KAGRA),宇宙線・宇宙物理領域)

    麻生 洋一, 梶田 隆章, 黒田 和明, 大橋 正健, 川村 静児, 三代木 伸二, 内山 隆, 宮川 治, 齋藤 芳男, 大石 奈緒子, 山元 一広, Khalaidovski Alexandar, Kumar Rahul, 大嶋 新一, 石塚 秀喜, 廣瀬 榮一, 上泉 眞裕, 榊原 裕介, 関口 貴令, 陳 タン, 中野 雅之, 小野 謙次, 小仁所 志栞, 西村 翼, 渡辺 篤, 山中 祐治, 宮本 昴拓, 田中 宏樹, 藤本 眞克, Flaminio Raffaele, 高橋 竜太郎, 上田 暁俊, 阿久津 智忠, 辰巳 大輔, 中村 康二, Arellano Fabian Pena, 石崎 秀晴, 鳥居 泰男, 田中 伸幸, 山本 明, 鈴木 敏一, 木村 誠宏, 都丸 隆行, 井岡 邦仁, 久米 達哉, 小池 重明, 横山 順一, 伊藤 洋介, 枝 和成, 坪野 公夫, 安東 正樹, 平松 成範, 穀山 渉, 岡田 健志, 松本 伸之, 道村 唯太, 正田 亜八香, 柴田 和憲, 牛場 崇文, 渡部 恭平, 三尾 典克, 大前 宣昭, 鈴木 健一郎, 古谷 寛之, 細谷 暁夫, 河合 誠之, 宗宮 健太郎, 須佐 友紀, 上田 慎一郎, 加藤 準平, 粂田 綾香, 神田 展行, 端山 和大, 横澤 孝章, 山本 尚弘, 譲原 浩貴, 田中 一幸, 浅野 光洋, 鳥谷 仁人, 有馬 司, 宮本 晃伸, 中尾 憲一, 中村 卓史, 田中 貴浩, 瀬戸 直樹, 西澤 篤志, 植田 憲一, 米田 仁紀, 中川 賢一, 武者 満, 新谷 昌人, 高森 昭光, 佐藤 修一, 林 翔平, 奥富 弘基, 高辻 利之, 尾藤 洋一, 寺田 聡一, 長野 重夫, 田越 秀行, 上野 昂, 成川 達也, 佐野 保道, 高倉 理, Baiotti Luca, 佐々木 節, 柴田 大, 樽家 篤史, 中野 寛之, 関口 雄一郎, 佐合 紀親, 斎藤 那菜, 新冨 孝和, 大原 謙一, 金山 雅人, 若松 剛司, 佐藤 孝, 大河 正志, 土井 康平, 齊藤 高大, 飯島 音浩, 志賀 和成, 高橋 弘毅, 姫本 宣朗, 浅田 秀樹, 二間瀬 敏史, 高橋 史宜, 原田 知広, 小嶌 康史, 瓜生 康史, 山田 章一, 西條 統之, 大森 隆夫, 松島 房和, 森脇 喜紀, 小林 かおり, 榎本 勝成, 大石 諒, 〓ノ下 陽哉, 柿崎 充, 小野 行徳, 堀 匡寛, 早川 陽介, 廣林 茂樹, 沖野 浩二, Ruggero Micheletto, 固武 慶, 江口 智士, 中谷 一郎, 阪田 紫帆里, 鹿野 豊, 春山 富義, 上原 知幸, 川添 史子, Chen Yanbei, 河邉 径太, 新井 宏二, Miao Haixing, 和泉 究, Tobar M.E, Blair D, Li Ju, Zhao Chunnong, Wen Linqing, Johnson Warren, 苔山 圭以子, Zhu Zong-Hong, Milyukov V, Baggio Lucio, Zhang Yang, Cao Junwei, Pan Sheau-Shi, Chen Sheng-Jui, 沼田 健司, Marka Szabolcs, Marka Zsuzsanna, Reid Stuart, Pinto Innocenzo, Galdi Vincenzo, Pierro Vincenzo, Castaldi Giuseppe, DeSalvo Riccardo, Croce Rocco P, Principe Maria, Matta Vincenzo, Postiglione Fabio, Longo Maurizio, Addesso Paolo, Fusco Adele, Majorana Ettore, Zhai Xiang-hua, Xi Ping, Ni Wei-Tou, Mei Hsien-Hao, Yoon Tai Hyun, Lee Hyung Won, Kim Kyoung Yee, Kim Jeongcho, Lee Hyung Mok, Kim Chunglee, Kim Jae Wan, Cha Yong-Ho, Lee Hyun Kyu, Lee Chang-Hwan, Kang Gungwon, Oh John J, Oh Sang Hoon, Park Myeong-Gu, Kim Sang Pyo, van Putten, Maurice H.P.M, Kyuman Cho, Xu Jun, Zheng Lihe, Wang Jingya, 樫山 和己, 八木 絢外, Pai Archana, 我妻 一博, 久徳 浩太郎

    日本物理学会講演概要集   69 ( 2 )   44 - 44   2014.8

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    Language：Japanese   Publisher：一般社団法人日本物理学会  

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  • 27aTL-1 大型低温重力波望遠鏡(KAGRA)プロジェクトの現状(27aTL 重力波(KAGRA),宇宙線・宇宙物理領域)

    安東 正樹, 梶田 隆章, 黒田 和明, 大橋 正健, 川村 静児, 三代木 伸二, 内山 隆, 宮川 治, 大石 奈緒子, 山元 一広, Khalaidovski Alexandar, Kumar Rahul, 西田 恵里奈, 石塚 秀喜, 東谷 千比呂, 廣瀬 榮一, 上泉 眞裕, 岩崎 詩子, 榊原 裕介, 関口 貴令, 陳 タン, 中野 雅之, 手嶋 航大, 小野 謙次, 小仁所 志栞, 西村 翼, 渡辺 篤, 藤本 眞克, Flaminio Raffaele, 高橋 竜太郎, 上田 暁俊, 阿久津 智忠, 辰巳 大輔, 中村 康二, Arellano Fabian Pena, Friedrich Daniel, 石崎 秀晴, 鳥居 泰男, 田中 伸幸, 奥冨 弘基, 江口 智士, 山本 明, 鈴木 敏一, 木村 誠宏, 都丸 隆行, 井岡 邦仁, 齊藤 芳男, 久米 達哉, 小池 重明, 横山 順一, 樽家 篤史, 伊藤 洋介, 坪野 公夫, 麻生 洋一, 平松 成範, 穀山 渉, 岡田 健志, 松本 伸之, 道村 唯太, 正田 亜八香, 柴田 和憲, 牛場 崇文, 渡辺 恭平, 三尾 典克, 森脇 成典, 大前 宣昭, 千葉 智弘, 福本 展大, 鈴木 健一郎, 古谷 寛之, 細谷 暁夫, 河合 誠之, 宗宮 健太郎, 須佐 友紀, 上田 慎一郎, 加藤 準平, 粂田 綾香, 神田 展行, 端山 和大, 横澤 孝章, 山本 尚弘, 譲原 浩貴, 田中 一幸, 浅野 光洋, 鳥谷 仁人, 中尾 憲一, 中村 卓史, 瀬戸 直樹, 西澤 篤志, 植田 憲一, 米田 仁紀, 中川 賢一, 武者 満, 新谷 昌人, 高森 昭光, 佐藤 修一, 林 翔平, 東浦 孝典, 高辻 利之, 尾藤 洋一, 寺田 総一, 長野 重夫, 田越 秀行, 上野 昂, 成川 達也, 佐野 保道, 高倉 理, Baiotti Luca, 佐々木 節, 柴田 大, 田中 貴浩, 中野 寛之, 関口 雄一郎, 佐合 紀親, 斎藤 那菜, 新冨 孝和, 大原 謙一, 平沼 悠太, 金山 雅人, 若松 剛司, 佐藤 孝, 大河 正志, 土井 康平, 前原 進也, 清水 直弥, 高橋 弘毅, 姫本 宣朗, 浅田 秀樹, 二間瀬 敏史, 高橋 史宜, 原田 知広, 小嶌 康史, 瓜生 康史, 山田 章一, 西條 統之, 大森 隆夫, 松島 房和, 森脇 喜紀, 小林 かおり, 榎本 勝成, 米山 直弥, 宮本 達也, 大石 諒, 〓ノ下 陽哉, 柿崎 充, 小野 行徳, 堀 匡寛, 早川 陽介, 廣林 茂樹, 沖野 浩二, Ruggero Micheletto, 固武 慶, 中谷 一郎, 阪田 紫帆里, 鹿野 豊, 春山 富義, 上原 知幸, 川添 史子, Chen Yanbei, 河邉 径太, 新井 宏二, Miao Haixing, 和泉 究, Tobar M.E, Blair D, Li Ju, Zhao Chunnong, Wen Linqing, Johnson Warren, 苔山 圭以子, Zhu Zong-Hong, Dhurandhar S, Mitra S, Milyukov V, Baggio Lucio, Zhang Yang, Cao Junwei, Pan Sheau-Shi, Chen Sheng-Jui, 沼田 健司, Marka Szabolcs, Marka Zsuzsanna, Reid Stuart, Pinto Innocenzo, Galdi Vincenzo, Pierro Vincenzo, Castaldi Giuseppe, DeSalvo Riccardo, Croce Rocco P, Principe Maria, Matta Vincenzo, Postiglione Fabio, Longo Maurizio, Addesso Paolo, Fusco Adele, Majorana Ettore, Zhai Xiang-hua, Xi Ping, Ni Wei-Tou, Mei Hsien-Hao, Wu Shan-Jyun, Yoon Tai Hyun, Lee Hyung Won, Kim Kyoung Yee, Kim Jeongcho, Lee Hyung Mok, Kim Chunglee, Kim Jae Wan, Cha Yong-Ho, Lee Hyun Kyu, Lee Chang-Hwan, Kang Gungwon, Oh John J, Oh Sang Hoon, Park Myeong-Gu, Kim Sang Pyo, Putten Maurice, H.P.M. van, Kyuman Cho, Xu Jun, Zheng Lihe, Wang Jingya, 樫山 和己, 八木 絢外, Pai Archana, 我妻 一博, 久徳 浩太郎

    日本物理学会講演概要集   69 ( 1 )   112 - 112   2014.3

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  • Emergence of intelligent behavior from a minimalistic stochastic model for the navigation of autonomous Robots

    Sun Zhe, Ruggero Micheletto

    2014 INTERNATIONAL CONFERENCE ON INFORMATION SCIENCE, ELECTRONICS AND ELECTRICAL ENGINEERING (ISEEE), VOLS 1-3   2   1300 - 1304   2014

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  • Blinking in Photoluminescence of InGaN Devices is Caused by Slow Beating of THz Vibrations of the Quantum Well

    Micheletto, Ruggero, Oikawa, Kotaro, Feldmeier, Christian

    Applied Mechanics and Materials   541-542   2014

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  • Surface exciton polaritons supported by a J-aggregated-dye/air interface

    Takatori Kentaro, Okamoto Takayuki, Ishibashi Koji, Micheletto Ruggero

    JSAP Annual Meetings Extended Abstracts   75th   905 - 905   2014

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    Language：Japanese   Publisher：The Japan Society of Applied Physics  

    DOI： 10.11470/jsapmeeting.2014.2.0_905

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  • プラズモニック電極を用いたレアメタルフリー有機薄膜太陽電池

    鷹取賢太郎, 西野貴幸, 岡本隆之, 竹井弘之, 石橋幸治, MICHELETTO Ruggero

    応用物理学会秋季学術講演会講演予稿集(CD-ROM)   74th   3370 - 3370   2013

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    Language：Japanese   Publisher：公益社団法人 応用物理学会  

    DOI： 10.11470/jsapmeeting.2013.2.0_3370

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  • Visual illusion due to the interaction of flickering and acoustic vibrotactile signals

    Ruggero Micheletto, Maria Fernanda Avila-Ortega

    2012.11

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    Publishing type：Internal/External technical report, pre-print, etc.  

    We studied the influence of mechanical vibrotactile signals in the acoustic<br />
    range to the visual perception of flickering images. These images are shown on<br />
    a CRT screen intermittent at about 75 Hz, without external perturbations are<br />
    perceived as constant and stable. However, if presented together with a<br />
    controlled acoustical vibration an illusion is perceived. The images appears to<br />
    float out of the screen, while the rest of the room is still perceived<br />
    normally. The acoustical signal given to the subjects were of very low<br />
    frequency (below 100Hz) and low amplitude (almost inaudible). The stimu...

    arXiv

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  • 視覚障害者歩行支援のための単眼カメラを用いた歩行者検出システム

    岸野嵩久, MICHELETTO Ruggero

    感覚代行シンポジウム   38th   2012

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  • Real-time near-field evidence of optical blinking in the photoluminescence of InGaN by scanning near-field optical microscope

    Kotaro Oikawa, Christian Feldmeier, Ulrich Theodor Schwarz, Yoichi Kawakami, Ruggero Micheletto

    OPTICAL MATERIALS EXPRESS   1 ( 2 )   158 - 163   2011.6

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  • A /30 resolution laser speckle pattern biosensor for dynamic studies on live samples

    Maria Fernanda Avila, Shigeki Yamaguchi, Hideho Uchiyama, Ruggero Micheletto

    Proceedings of the 2011 7th International Conference on Intelligent Sensors, Sensor Networks and Information Processing, ISSNIP 2011   37 - 40   2011

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  • Index of refraction sensors: Virtually unlimited sensing power at critical angle

    Ruggero Micheletto, Ishii Hikaru

    Optics InfoBase Conference Papers   2010.12

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  • Tenfold improved sensitivity using high refractive-index substrates for surface plasmon sensing

    Ruggero Micheletto, Katsumi Hamamoto, Takashi Fujii, Yoichi Kawakami

    APPLIED PHYSICS LETTERS   93 ( 17 )   3   2008.10

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  • 多重反射の光学センサー

    RUGGERO Micheletto

    2008 ( 22 )   9 - 12   2008.9

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  • A polarization-modulation method for the near-field mapping of laterally grown InGaN samples

    Ruggero Micheletto, Daisuke Yamada, Maria Allegrini, Yoichi Kawakami

    OPTICS EXPRESS   16 ( 10 )   6889 - 6895   2008.5

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  • Optical nanometer-scale sensing of mechanical vibrations with a planar glass at critical angle

    Ruggero Micheletto, Yoichi Kawakami, Katsumi Hamamoto

    APPLIED PHYSICS LETTERS   90 ( 24 )   2007.6

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  • Artefacts in polarization modulation scanning near-field optical microscopes

    R. Micheletto, M. Allegrini, Yoichi Kawakami

    JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS   9 ( 5 )   431 - 434   2007.5

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  • Acoustical nanometre-scale vibrations of live cells detected by a near-field optical setup

    Rosaria Piga, Ruggero Micheletto, Yoichi Kawakami

    OPTICS EXPRESS   15 ( 9 )   5589 - 5594   2007.4

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  • Dichroism of diamond grains by a polarization modulated near field optical setup

    Ruggero Micheletto, Yoichi Kawakami, Claudio Manfredotti, Yiuri Garino, Maria Allegrini

    APPLIED PHYSICS LETTERS   89 ( 12 )   3   2006.9

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  • Shape dependent thermal effects in apertured fiber probes for scanning near-field optical microscopy

    A. Ambrosio, O. Fenwick, F. Cacialli, R. Micheletto, Y. Kawakami, P. G. Gucciardi, D. J. Kang, M. Allegrini

    JOURNAL OF APPLIED PHYSICS   99 ( 8 )   6   2006.4

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  • An original planar multireflection system for sensing using the local surface plasmon resonance of gold nanospheres

    K Hamamoto, R Micheletto, M Oyama, AA Umar, S Kawai, Y Kawakami

    JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS   8 ( 3 )   268 - 271   2006.3

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    We realized a planar multireflection glass system to investigate the localized surface plasmon resonance (LSPR) of gold nanoparticles. These nanospheres were realized it? situ using an original and simple chemical growth method that is described. We were able to observe resonance phenomena as reflected by variations in the spectrum and as enhancements in the refractive index sensing ability. The system was able to clearly discern 2% sucrose solution and demonstrated outstanding linearity and reproducibility. We believe this study could be useful for elucidating the fundamental processes in nanoparticle LSPR and contribute to the realization of new and more efficient sensors.

    DOI： 10.1088/1464-4258/8/3/007

    Web of Science

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  • An original planar multireflection system for sensing using the local surface plasmon resonance of gold nanospheres

    K Hamamoto, R Micheletto, M Oyama, AA Umar, S Kawai, Y Kawakami

    JOURNAL OF OPTICS A-PURE AND APPLIED OPTICS   8 ( 3 )   268 - 271   2006.3

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    Language：English   Publisher：IOP PUBLISHING LTD  

    We realized a planar multireflection glass system to investigate the localized surface plasmon resonance (LSPR) of gold nanoparticles. These nanospheres were realized it? situ using an original and simple chemical growth method that is described. We were able to observe resonance phenomena as reflected by variations in the spectrum and as enhancements in the refractive index sensing ability. The system was able to clearly discern 2% sucrose solution and demonstrated outstanding linearity and reproducibility. We believe this study could be useful for elucidating the fundamental processes in nanoparticle LSPR and contribute to the realization of new and more efficient sensors.

    DOI： 10.1088/1464-4258/8/3/007

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  • Observation of a nanometer size confined transient phenomenon. at the gold STM tip interface under UV illumination

    R Micheletto, M Yokokawa, Y Ding, D Hobara, T Kakiuchi, Y Kawakami

    COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS   273 ( 1-3 )   189 - 192   2006.2

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  • Observation of optical instabilities in the photoluminescence of InGaN single quantum well

    R Micheletto, M Abiko, A Kaneta, Y Kawakami, Y Narukawa, T Mukai

    APPLIED PHYSICS LETTERS   88 ( 6 )   3   2006.2

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  • Index-of-refraction sensors: virtually unlimited sensing power at the critical angle

    R Micheletto, Y Kawakami, K Hamamoto, S Kawai

    OPTICS LETTERS   31 ( 2 )   205 - 207   2006.1

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    Language：English   Publisher：OPTICAL SOC AMER  

    In an effort to improve and simplify refractive index sensors, we identified a basic operation mode at the critical angle. Sensitivity to the refractive index is higher than in standard surface plasmon resonance sensors, and we have been able to demonstrate analytically that it is virtually an unbounded value. We describe this approach and submit a complete analytical study demonstrating its unlimited sensing power. To test the approach, we constructed an economical and basic sensor. Despite its simplicity, we demonstrated the discrimination capability to be of the order of 10(-6), as far as we know close to the best sensitivity ever recorded. This detection method is generally applicable to any optical system and may pave the way for the next generation of optical sensing devices. (c) 2006 Optical Society of America.

    DOI： 10.1364/OL.31.000205

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  • Fabrication of an atomic resolution low cost STM-SNOM hybrid probe

    R Micheletto, M Yokokawa, S Okazakaki, Y Kawakami

    JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY   6 ( 1 )   72 - 76   2006.1

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    We derived a simple method to fabricate STM-SNOM hybrid probes obtained from commercial cheap communication optical fibers. The tips are fabricated by a methodology that combines two well-known techniques: the selective attack by a buffered solution and the protected layer chemical etching, in a single new one-step technique. The tailored probes are then sputtered by metal and mounted on a STM setup. The usual difficulties of integrating the optical fiber in the STM head are solved originally with a particular home made mount described in details. We will show that the resulting probes reach atomic resolution on both vertical and horizontal scale, and that the optical imaging is free of artifacts and satisfactory with a lateral resolution in the order of lambda/20, as far as we know the finest resolution obtained with a system based on a hybrid fiber probe. We believe that our methodology is very interesting for its simplicity of realization and for the good resolving power in both SNOM and STM modes.

    DOI： 10.1166/jnn.2006.109

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  • Index-of-refraction sensors: virtually unlimited sensing power at the critical angle

    R Micheletto, Y Kawakami, K Hamamoto, S Kawai

    OPTICS LETTERS   31 ( 2 )   205 - 207   2006.1

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    Language：English   Publisher：OPTICAL SOC AMER  

    In an effort to improve and simplify refractive index sensors, we identified a basic operation mode at the critical angle. Sensitivity to the refractive index is higher than in standard surface plasmon resonance sensors, and we have been able to demonstrate analytically that it is virtually an unbounded value. We describe this approach and submit a complete analytical study demonstrating its unlimited sensing power. To test the approach, we constructed an economical and basic sensor. Despite its simplicity, we demonstrated the discrimination capability to be of the order of 10(-6), as far as we know close to the best sensitivity ever recorded. This detection method is generally applicable to any optical system and may pave the way for the next generation of optical sensing devices. (c) 2006 Optical Society of America.

    DOI： 10.1364/OL.31.000205

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  • The study of InGaN SQW materials with Polarization Modulation SNOM

    Ruggero Micheletto, Daisuke Yamada, Yoichi Kawakami, Maria Allegrini

    Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference, CLEO/QELS 2006   2006

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    We investigate on the photoluminescence spatial unhomogeneities of InGaN/GaN interface with a Polarization Modulation Scanning Near-field Tunneling Microscope. We could demonstrate for the first time nanometer sized domains that present polarization-changing properties. © 2006 IEEE.

    DOI： 10.1109/CLEO.2006.4628640

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  • The study of InGaN SQW materials with Polarization Modulation SNOM

    Ruggero Micheletto, Daisuke Yamada, Yoichi Kawakami, Maria Allegrini

    Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference, CLEO/QELS 2006   2006

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    We investigate on the photoluminescence spatial unhomogeneities of InGaN/GaN interface with a Polarization Modulation Scanning Near-field Tunneling Microscope. We could demonstrate for the first time nanometer sized domains that present polarization-changing properties. © 2006 IEEE.

    DOI： 10.1109/CLEO.2006.4628640

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  • The fabrication of a low cost STM-SNOM hybrid probe

    Micheletto Ruggero

    Nanoscience and Nanotechnology   6   5   2006

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  • Nano-probing of the membrane dynamics of rat pheochromocytoma by near-field optics

    R Piga, R Micheletto, Y Kawakami

    BIOPHYSICAL CHEMISTRY   117 ( 2 )   141 - 146   2005.9

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    Language：English   Publisher：ELSEVIER SCIENCE BV  

    High-resolution analysis of activities of live cells is limited by the use of non-invasive methods. Apparatuses such as SEM, STM or AFM are not practicable because the necessary treatment or the harsh contact with system probe will disturb or destroy the cell. Optical methods are purely non-invasive, but they are usually diffraction limited and then their resolution is limited to approximately I gm. To overcome these restrictions, we introduce here the study of membrane activity of a live cell sample using a Scanning Near-field Optical Microscope (SNOM). A near field optical microscope is able to detect tiny vertical movement on the cell membrane in the range of only 1 nm or less, about 3 orders of magnitude better than conventional optical microscopes. It is a purely non-invasive, non-contact method, so the natural life activity of the sample is unperturbed. In this report, we demonstrated the nanometer-level resolving ability of our SNOM system analyzing cardiomyocytes samples of which membrane movement is known, and then we present new intriguing data of sharp 40 mn cell membrane sudden events on rat pheochromocytoma. cell line PC12. All the measurements are carried out in culture medium with alive and unperturbed samples. We believe that this methodology will open a new approach to investigate live samples. The extreme sensitivity of SNOM allows measurements that are not possible with any other method on live biomaterial paving the way for a broad range of novel studies and applications. (c) 2005 Elsevier B.V. All rights reserved.

    DOI： 10.1016/j.bpc.2005.04.018

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  • Carbon nanotube/P(VDF-TrFE) nano-composite characterization by total reflection x-ray fluorescence

    K. El-Hami, S. Kuwajima, R. Micheletto, K. Matsushige

    Journal of Applied Spectroscopy   72 ( 5 )   771 - 774   2005.9

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    In continuation of our research on carbon nanotube/P(VDF-TrFE) nano-composites [1], total x-ray fluorescence (TXRF) is engaged in a novel characterization of these materials regarding their compositions, purities, and structural analysis. Samples such as single-walled carbon nanotubes (SWCNT), multi-walled carbon nanotubes (MWCNT), P(VDF-TrFE) copolymer, SWCNT/P(VDF-TrFE), and MWCNT/P(VDF-TrFE) were analyzed by TXRF. The synthetic quartz used as a substrate was analyzed as reference material for the TXRF measurements. The ethanol and the dimethylformamide (DMF) used as solvents for carbon nanotubes and copolymers respectively were also analyzed by TXRF to determine whether they have an influence or not on the TXRF of the previous material. The preliminary results showed that single-walled and multi-walled carbon nanotubes prepared by the arc-discharge method contain catalytic particles such as Fe, Co, and Ni used to obtain SWCNT while there were no metal or impurities in MWCNT. The TXRF spectrum of CNT/P(VDF-TrFE) showed the same results as we found previously with background due to the P(VDF-TrFE) copolymer scattered signal. ©2005 Springer Science+Business Media, Inc.

    DOI： 10.1007/s10812-005-0147-9

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  • Carbon nanotube/P(VDF-TrFE) nano-composite characterization by total reflection x-ray fluorescence

    K. El-Hami, S. Kuwajima, R. Micheletto, K. Matsushige

    Journal of Applied Spectroscopy   72 ( 5 )   771 - 774   2005.9

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    In continuation of our research on carbon nanotube/P(VDF-TrFE) nano-composites [1], total x-ray fluorescence (TXRF) is engaged in a novel characterization of these materials regarding their compositions, purities, and structural analysis. Samples such as single-walled carbon nanotubes (SWCNT), multi-walled carbon nanotubes (MWCNT), P(VDF-TrFE) copolymer, SWCNT/P(VDF-TrFE), and MWCNT/P(VDF-TrFE) were analyzed by TXRF. The synthetic quartz used as a substrate was analyzed as reference material for the TXRF measurements. The ethanol and the dimethylformamide (DMF) used as solvents for carbon nanotubes and copolymers respectively were also analyzed by TXRF to determine whether they have an influence or not on the TXRF of the previous material. The preliminary results showed that single-walled and multi-walled carbon nanotubes prepared by the arc-discharge method contain catalytic particles such as Fe, Co, and Ni used to obtain SWCNT while there were no metal or impurities in MWCNT. The TXRF spectrum of CNT/P(VDF-TrFE) showed the same results as we found previously with background due to the P(VDF-TrFE) copolymer scattered signal. ©2005 Springer Science+Business Media, Inc.

    DOI： 10.1007/s10812-005-0147-9

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  • Waveguide behavior of Distributed Bragg Reflectors probed by polarization-modulated near-field optical microscopy

    PG Gucciardi, M Allegrini, R Micheletto, T Kotani, T Hatada, Y Kawakami

    JOURNAL OF THE KOREAN PHYSICAL SOCIETY   47 ( SUPPL. 1 )   S101 - S108   2005.8

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  • Modeling and test of fiber-optics fast SPR sensor for biological investigation

    R Micheletto, K Hamamoto, S Kawai, Y Kawakami

    SENSORS AND ACTUATORS A-PHYSICAL   119 ( 2 )   283 - 290   2005.4

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  • Magnetic induced vertical crystal growth of perylene cation radicals on ITO glass surface

    R Micheletto, J Matsui, M Oyama, K El-Hami, K Matsushige, Y Kawakami

    APPLIED SURFACE SCIENCE   242 ( 1-2 )   129 - 133   2005.3

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  • Confined waveguide behavior of Distributed Bragg Reflectors probed by polarization-controlled Near Field Optical Microscopy

    Micheletto Ruggero

    J. Korean Physical Society   47   8   2005

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  • Confined waveguide behavior of Distributed Bragg Reflectors probed by polarization-controlled Near Field Optical Microscopy

    Micheletto, Ruggero

    47   8   2005

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  • Thermal effects in near-field optical microscopy experiments

    A. Ambrosio, M. Allegrini, R. Micheletto, P. G. Gucciardi, Y. Kawakami, O. Fenwick, F. Cacialli

    IQEC, International Quantum Electronics Conference Proceedings   2005   1162 - 1163   2005

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  • Evidence of polarized InGaN SQW photoluminescence by a Polarization Modulation SNOM

    Ruggero Micheletto, Yoichi Kawakami, Maria Allegrini

    IQEC, International Quantum Electronics Conference Proceedings   2005   1044 - 1045   2005

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  • Nano probing of the membrane dynamics of rat phochromocytoma by near field optics

    Micheletto, Ruggero

    117   6   2005

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  • Study of long time-scale photoluminescence dynamics of GaN/InGaN quantum wells and comparison with samples grown on ELOG-GaN

    R. Micheletto, M. Abiko, A. Kaneta, Y. Narukawa, T. Mukai, Y. Kawakami

    Proceedings - Electrochemical Society   6   341 - 350   2004.12

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  • Indium concentration influence on PL spatial inhomogeneity in InGaN single quantum well structures detected by original low-cost near-field probes

    R Micheletto, N Yoshimatsu, A Kaneta, Y Kawakami, S Fujita

    APPLIED SURFACE SCIENCE   229 ( 1-4 )   338 - 345   2004.5

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  • Real time observation of trans-cis isomerization on azobenzene SAM induced by optical near field enhancement

    R Micheletto, M Yokokawa, M Schroeder, D Hobara, Y Ding, T Kakiuchi

    APPLIED SURFACE SCIENCE   228 ( 1-4 )   265 - 270   2004.4

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  • 顕微分光法によるInGaNナノ構造の発光機構解明

    川上養一, 金田昭男, 西塚幸司, 小島一信, ZHU Y, 山田大輔, MICHELETTO R, 成川幸男, 向井孝志

    応用物理学会学術講演会講演予稿集   65th   2004

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  • Nano-localized desorption and time-of-flight mass analysis using solely optical enhancement in the proximity of a scanning tunneling microscope tip

    Y Ding, R Micheletto, S Okazaki, K Otsuka

    APPLIED SURFACE SCIENCE   211 ( 1-4 )   82 - 88   2003.4

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  • Study of the fluorescence of perylene cation radical salts with a near field optical setup

    R Micheletto, J Matsui, N Yoshimatsu, M Oyama, S Okazaki

    COLLOID AND POLYMER SCIENCE   280 ( 12 )   1067 - 1074   2002.12

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  • Near field stimulated time of flight mass surface analyzer

    Y Ding, R Micheletto, H Hanada, T Nagamura, S Okazaki, K Otsuka

    OPTICAL REVIEW   9 ( 6 )   277 - 281   2002.11

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  • Development of laser assisted nanometric resolution scanning tunneling microscopy time-of-flight mass analyzer system

    Y Ding, R Micheletto, H Hanada, T Nagamura, S Okazaki

    REVIEW OF SCIENTIFIC INSTRUMENTS   73 ( 9 )   3227 - 3231   2002.9

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  • Optical study of a polymeric LED with a nano-sized electrode realized by a modified SNOM setup

    R Micheletto, N Yoshimatsu, M Yokokawa, TY An, H Lee, S Okazaki

    OPTICS COMMUNICATIONS   196 ( 1-6 )   47 - 53   2001.9

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  • A simple method for the fabrication of low cost scanning near field optical microscope probes with acrylic paint as coating element

    R Micheletto, N Yoshimatsu, S Okazaki

    OPTICS COMMUNICATIONS   188 ( 1-4 )   11 - 15   2001.2

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  • Observation of the dynamics of live cardiomyocytes through a free-running scanning near-field optical microscopy setup

    Micheletto, R., Denyer, M., Scholl, M., Nakajima, K., Offenhauser, A., Hara, M., Knoll, W.

    Applied Optics   38 ( 31 )   6648 - 6652   1999.11

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  • Development of Hybrid SNOM/STM and its Application to Organic Molecules

    Nakajima Ken, Micheletto Ruggero, Mitsui Keita, Isoshima Takashi, Hara Masahiko, Wada Tatsuo, Sasabe Hiroyuki

    Proceedings of the Society Conference of IEICE   1999 ( 2 )   164 - 165   1999.8

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  • Development of a Hybrid Scanning Near-field Optical/Tunneling Microscope (SNOM/STM) System

    NAKAJIMA Ken, MICHELETTO Ruggero, MITSUI Keita, ISOSHIMA Takashi, HARA Masahiko, WADA Tatsuo, SASABE Hiroyuki, KNOLL Wolfgang

    Journal of the Surface Science Society of Japan   20 ( 8 )   509 - 515   1999.8

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    Language：Japanese   Publisher：The Surface Science Society of Japan  

    A scanning near-field optical microscope (SNOM) combined with a scanning tunneling microscope (STM) is used to investigate nanoscopic optical phenomena both in the near-field region and in the proximity. The system is realized by introducing a doubly metal-coated optical fiber tip with an extremely small aperture, on which metal-coating is performed to obtain a half-transparent conducting tip. A simultaneous SNOM/STM observation is performed for an Au (111) surface, where the evanescent field standing on the tip vicinity through the aperture is scattered by the local structures of the sample and the far-field component of the scattered light is collected as an optical signal. The distance con-trol is carried out under constant current condition in order to separate the optical properties from surface topography. &lambda;/100 optical resolution and the identical channel transport both for electrons and photons are achieved.

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  • Development of a hybrid scanning near-field optical/tunneling microscope (SNOM/STM) system

    K Nakajima, R Micheletto, K Mitsui, T Isoshima, M Hara, T Wada, H Sasabe, W Knoll

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS   38 ( 6B )   3949 - 3953   1999.6

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    Language：English   Publisher：JAPAN J APPLIED PHYSICS  

    Scanning near-field optical microscope (SNOM) is hybridized with a Scanning tunneling microscope (STM) to investigate nanoscopic optical phenomena in both the near-field region and its proximity. The system is realized by introducing a doubly metal-coated optical fiber tip with an extremely small aperture (&lt; 100 nm); where the metal is coated on the aperture to obtain a half-transparent conducting tip after the fabrication of an "aperture probe." A simultaneous SNOM/STM observation is performed for an Au (111) surface, where the evanescent field at the tip vicinity through the aperture is scattered by the local structures of the sample and the far-field component of the scattered light is collected as an optical signal. The distance control is carried out under the constant-current condition in order to separate the optical properties from surface topography. An optical resolution of lambda/100 and identical channel transport for both electrons and photons are achieved. The intensity changes, as a function of the gap distance, are also measured in the far-field and the near-field regions and the proximity.

    DOI： 10.1143/JJAP.38.3949

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  • Development of a hybrid scanning near-field optical/tunneling microscope (SNOM/STM) system

    K Nakajima, R Micheletto, K Mitsui, T Isoshima, M Hara, T Wada, H Sasabe, W Knoll

    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS   38 ( 6B )   3949 - 3953   1999.6

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    Language：English   Publisher：JAPAN J APPLIED PHYSICS  

    Scanning near-field optical microscope (SNOM) is hybridized with a Scanning tunneling microscope (STM) to investigate nanoscopic optical phenomena in both the near-field region and its proximity. The system is realized by introducing a doubly metal-coated optical fiber tip with an extremely small aperture (&lt; 100 nm); where the metal is coated on the aperture to obtain a half-transparent conducting tip after the fabrication of an "aperture probe." A simultaneous SNOM/STM observation is performed for an Au (111) surface, where the evanescent field at the tip vicinity through the aperture is scattered by the local structures of the sample and the far-field component of the scattered light is collected as an optical signal. The distance control is carried out under the constant-current condition in order to separate the optical properties from surface topography. An optical resolution of lambda/100 and identical channel transport for both electrons and photons are achieved. The intensity changes, as a function of the gap distance, are also measured in the far-field and the near-field regions and the proximity.

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  • In vitro monitoring of live cardiomyocytes dynamics by a scanning near field optical microscope setup

    R Micheletto, M Denyer, M Scholl, K Nakajima, M Hara, W Knoll

    OPTICAL REVIEW   6 ( 3 )   268 - 271   1999.5

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    We describe an original scanning near field optical microscope setup developed to examine rhythmically beating cardiac myocytes fully immersed in culture media. Scans could be halted at any point to record localized contraction profiles, Contractions could be detected with high sub nanometric vertical sensitivity and changed shape dramatically within adjacent sub micron-sized areas. We believe that the spatial dependency of contractions arises because of system's ability to resolve the dynamic behavior of individual sub membrane actin bundles. Our results, combining imaging and real time recording in localized areas, reveal a new, non-invasive method for studying sub micron morphological activity in live biological samples.

    DOI： 10.1007/s10043-999-0268-0

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  • Direct mapping of the far and near field optical emission of nano-sized tapered glass fibers by an integrated SNOM SF system

    R Micheletto, K Nakajima, M Geisler, M Hara, W Knoll

    APPLIED SURFACE SCIENCE   144-45   514 - 519   1999.4

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  • Nanoscopic studies investigated by hybrid SNOM STM

    K Nakajima, R Micheletto, K Mitsui, T Isoshima, M Hara, T Wada, H Sasabe, W Knoll

    APPLIED SURFACE SCIENCE   144-45   520 - 524   1999.4

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  • In vitro monitoring of live cardiomyocytes dynamics by a scanning near field optical microscope setup

    Ruggero Micheletto, Morgan Denyer, Martin Scholl, Ken Nakajima, Masahiko Hara, Wolfgang Knoll

    Optical Review   6 ( 3 )   268 - 271   1999

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    Language：English   Publisher：Optical Society of Japan  

    We describe an original scanning near field optical microscope setup developed to examine rhythmically beating cardiac myocytes fully immersed in culture media. Scans could be halted at any point to record localized contraction profiles. Contractions could be detected with high sub nanometric vertical sensitivity and changed shape dramatically within adjacent sub micron-sized areas. We believe that the spatial dependency of contractions arises because of system's ability to resolve the dynamic behavior of individual sub membrane actin bundles. Our results, combining imaging and real time recording in localized areas, reveal a new, non-invasive method for studying sub micron morphological activity in live biological samples.

    DOI： 10.1007/s10043-999-0268-0

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  • Hybridization of scanning near-field optical microscope with scanning tunneling microscope

    K Nakajima, R Micheletto, K Mitsui, T Isoshima, M Hara, T Wada, H Sasabe, W Knoll

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS   327   241 - 244   1999

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  • Development of a hybrid SNOM/STM and its application to organic ultra-thin films

    Ken Nakajima, Ruggero Micheletto, Keita Mitsui, Takashi Isoshima, Masahiko Hara, Tatsuo Wada, Hiroyuki Sasabe, Wolfgang Knoll

    MOLECULAR CRYSTALS AND LIQUID CRYSTALS SCIENCE AND TECHNOLOGY SECTION A-MOLECULAR CRYSTALS AND LIQUID CRYSTALS   322   209 - 214   1998

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  • Near-field optical imaging of flagellar filaments of Salmonella in water with optical feedback control

    M Naya, R Micheletto, S Mononobe, RU Maheswari, M Ohtsu

    APPLIED OPTICS   36 ( 7 )   1681 - 1683   1997.3

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  • A Simple Method for the Production of a Two-Dimensional, Ordered Array of Small Latex Particles

    R. Micheletto, H. Fukuda, M. Ohtsu

    Langmuir   11 ( 9 )   3333 - 3336   1995.9

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  • DEVELOPMENT OF AN OPTICAL-SCANNING TUNNELING MICROSCOPE

    A DEMARCO, R MICHELETTO, A TRABUCCO, P VIOLINO

    OPTICS COMMUNICATIONS   95 ( 4-6 )   210 - 214   1993.1

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  • Structural study of the aggregates formed by the dinucleoside phosphate g2 in aqueous solution

    Amaral, L.Q., Itri, R., Mariani, P., Micheletto, R.

    Liquid Crystals   12 ( 6 )   913 - 919   1992.1

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Presentations

  • Rare-metal-free organic thin-film solar cells using a plasmonic electrode International conference

    Kentaro Takatori, Takayuki Nishino, Takayuki Okamoto, Hiroyuki Takei, Koji Ishibashi, Ruggero Micheletto

    26th International Microprocesses and Nanotechnology Conference (MNC 2013)  2013.11 

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  • 近接場走査型顕微鏡による細胞イメージング

    第2回集積光デバイス技術研究会 （フォトニクスのバイオ応用へのニューフロンティア）  2003 

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  • Blinking in Photoluminescence of InGaN Devices is Caused by Slow Beating of THz Vibrations of the Quantum Well International conference

    Micheletto Ruggero, Oikawa Kotaro, Christian Feldmeier

    The 4th International Conference on Advanced Materials Research  2014.1 

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  • 屈折率センサー：臨界角度測定による理想的に無限なセンシング感度について

    OSA 2010 Optical Sensors (Sensors)  2010 

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  • Optical Instabilities and blinking phenomena in the emission of InGaN quantum wells

    France-Japan Workshop on Nanophotonics  2010 

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  • Index of Refraction Sensors: Virtually Unlimited Sensing Power at Critical Angle

    OSA 2010 Optical Sensors (Sensors)  2010 

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  • Metal nanoparticle induced blinking in green InGaN quantum wells International conference

    Anne Kuhnert, Ulrich T. Schwarz, Christian Feldmeier, Ruggero Micheletto

    8th International Conference on Nitride Semiconductors, ICNS-8  2009.10 

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  • グリーン発光のInGaNデバイスにおける金ナノ粒子の影響で点滅現象の研究

    2009 

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  • InGaN/GaN LED発光デバイスの複雑現象

    横浜第4回ナノテク交流シンポジウム  2009 

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  • The Photoluminescence of InGaN/GaN Single Quantum Wells –Optical Instabilities

    The fourth Yokohama Nanotech Collaboration Symposium  2009 

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  • A multiple reflections optical sensor

    RUGGERO Micheletto

    電気学会フィジカルセンサ研究会資料  2008.9 

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  • Blinking Luminous Centers in a InGaN Quantum Well International conference

    R. Micheletto, S. Suzuki, Y. Kawakami, A. Kunold, P. Pereyra, Y. Narukawa, T. Mukai

    15th International Conference on Superlattices, Nanostructures and Nanodevices (ICSNN)  2008.8 

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  • InGaN量子井戸における発行の点滅現象

    2008 

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  • Investigation of DNA Modifications in a Soil Bacterium After Exposure to Organic and Inorganic Pollutants by LC-tandem Mass Spectrometry International conference

    Kanaly, R. A, Micheletto, R, Maeda, A. H, Hamamura, N

    American Society for Microbiology General Meeting 2013, Denver, CO, USA  2013.5 

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  • A Monocular Pedestrian Detection System for the Visually Impaired

    Micheletto Ruggero

    2012.12 

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  • Absorption-Induced Transparency in Plane Metallic Films

    OKAMOTO Takayuki, TAKATORI Kentaro, MICHELETTO Ruggero, ISHIBASHI Koji

    応用物理学会学術講演会講演予稿集(CD-ROM)  2012.8 

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  • Exiton-Surface Plasmon Strong Coupling in Plasmonic Crystals

    K. Takatori, T. Okamoto, K. Oikawa, R. Micheletto

    20th "Near-field Optics" meeting of the Optical Society of Japan  2012.5 

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    File： NanoOptics_05232012.pdf

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  • The study of the blinking phenomenom in InGaN optical devices

    R. Micheletto, H. Goto

    20th "Near-field Optics" meeting of the Optical Society of Japan  2012 

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  • A novel optical illusion based on visual-acoustical sensory interaction, possible applications

    Micheletto Ruggero

    第37回感覚代行シンポジウム  2011.12 

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  • An optical Instability phenomena in the optical emission of InGaN devices

    Progress in Electromagnetics Research Symposium (PIERS 2011)  2011 

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  • A novel optical illusion based on visual-acoustical sensory interaction, possible applications

    2011 

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  • An optical Instability phenomena in the optical emission of InGaN devices

    Progress in Electromagnetics Research Symposium (PIERS 2011)  2011 

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  • InGaNにおける光学不安定現象及び点滅現象についての研究

    2010 

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  • Software-aided Processing of DNA Adductomics Data Obtained by Liquid Chromatography Electrospray Ionization Tandem Mass Spectrometry International conference

    Kanaly Robert

    The XII International Congress of Toxicology (ICT2013), The 2nd International Conference on Environmental Omics, Seoul, South Korea  2013.6 

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    Language：English   Presentation type：Oral presentation (general)  

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  • Surface exciton polaritons supported by a J-aggregated-dye/air interface

    Micheletto Ruggero

    75th JSAP Autumn Meeting 2014  2014.9 

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    Language：Japanese   Presentation type：Oral presentation (general)  

    File： 2014takatori-1.pdf

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  • Plasmonic electrodes without rare metals for organic solar cells

    Takatori K, Nishino N, Okamoto T, Takei M, Ishibashi Y. Micheletto R

    the 9th joint symposium of Yokohama National University and Yokohama City University.  2014.3 

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    Language：Japanese   Presentation type：Oral presentation (general)  

    File： img-takatoripre-62901.pdf

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Industrial property rights

  • センサチップ及びそれを用いたセンサ装置

    ミケレット・ルジェロ, 川上 養一, 河井 昭治, 浜本 勝美

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    Applicant：国立大学法人京都大学, テラメックス株式会社

    Application no：特願2004-179867  Date applied：2004.6

    Announcement no：特開2006-003217  Date announced：2006.1

    J-GLOBAL

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  • 表面プラズモン共鳴センサ及びそのセンサを用いた表面プラズモン共鳴センサ装置並びにそのセンサを用いた検出方法

    ミケレット・ルジェロ, 川上 養一, 藤田 茂夫, 河井 昭治, 中田 幸男

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    Applicant：国立大学法人京都大学, テラメックス株式会社

    Application no：特願2004-072908  Date applied：2004.3

    Announcement no：特開2005-257631  Date announced：2005.9

    J-GLOBAL

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  • 基盤及びその製造方法、光ファイバプローブ及びその製造方法

    ルジェロ ミケレット, 福田 浩章, 大津 元一

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    Applicant：財団法人神奈川科学技術アカデミー

    Application no：特願平6-301937  Date applied：1994.12

    Announcement no：特開平8-160225  Date announced：1996.6

    J-GLOBAL

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  • 記録媒体及びその製造方法、記録方法及び記録装置

    福田 浩章, ルジェロ ミケレット, 大津 元一

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    Applicant：財団法人神奈川科学技術アカデミー

    Application no：特願平6-301936  Date applied：1994.12

    Announcement no：特開平8-160564  Date announced：1996.6

    J-GLOBAL

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Awards

  • 京都大学VBL平成19年度若手研究助成成果報告会

    2007  

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    Country：Japan

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  • 第11回近接場光学賞

    2002  

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    Country：Japan

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  • The 11th Near-field optics award

    2002  

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  • 表面科学技術賞

    2000  

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    Country：Japan

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Research Projects

  • Study on the the optical blinking of InGaN materials by near-field optical microscope

    Grant number：24560014  2012.4 - 2015.3

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    MICHELETTO Ruggero

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    Grant amount：\5460000 （ Direct Cost: \4200000 、 Indirect Cost：\1260000 ）

    This project had the main goal to solve the enigma of optical blinking in LED and other devices. This phenomena is present in Indium Gallium Nitrides LEDs and its causes were unknown. We could approach the problem experimentally and with the development of theoretical models. In these three years we could clarify what is the real cause of the blinking. The blinking is caused by the interference of thermal vibrations in the crystal lattice that alters the frequencies of a small amount. In this way we observe the blinking phenomena because crystal lattice structure is proportional to luminosity. Also we verified with very advance analysis with ab-initio methods that absorbed impure gas materials on the surface of the device may be responsible for the blinking. Besides these investigations, we also did a purely experimental approach with low-temperature and vacuum microscopy analysis with different gas to elucidate the influence on blinking (research paper in preparation).

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  • Development of key technologies for the measurement of luminescence dynamics in the nano-space

    Grant number：18206002  2006 - 2008

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)  Grant-in-Aid for Scientific Research (A)

    KAWAKAMI Yoichi, FUNATO Mitsuru, MICHELETTO Ruggero

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    Grant amount：\48490000 （ Direct Cost: \37300000 、 Indirect Cost：\11190000 ）

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  • Development of nano-scale surface elemental analysis using pulse excitation by evanescent light and evaluation of material functions

    Grant number：11355034  1999 - 2001

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)  Grant-in-Aid for Scientific Research (A)

    MORISHITA Fujio, OYAMA Munetaka, NAGAMURA Toshihiko, OKAZAKI Satoshi, MICHELETTO Ruggero

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    Grant amount：\27540000 （ Direct Cost: \27000000 、 Indirect Cost：\540000 ）

    The analysis of the chemical composition, the chemical structure and the chemical state of the local superfine site of the surface of materials is very important for the elucidation of the emergence mechanism of their functions and their properties. It also leads to excellentmethods for controlling their functions and the development of new materials with higher functions.
    In this work, the authors attempted to develop a new technique using the concept of ultraviolet photoelectron spectroscopy (UPS) and the evanescent light for excitation, which is induced from a capillary probe of scanning nearfield optical microscope. Since the spot size obtained by the evanescent light does not depend on the wavelength but on the aperture of the probe, the evanescent light froma capillary with ultrafine aperture can excite an extremely small local site of the material surface. After a home-made UPS apparatus was constructed, various fundamental discussions were carried out about instrumental and experimental parameters ; the optimal way for preparation of the capillary probe was established and the dispersion property of an energy analyzer with a cylindrical mirror adopted in our apparatus and the amplification property of a channeltron multiplier chosen as the detector were investigated minutely. An electron-oscillation type helium lamp was adopted as the light source since it emits stablyunder low helium pressure and it can be easily connected to a high-vacuumsystem. The discharge characteristics of the helium lamp such as the relationship between the gas pressure and the emission strength were confirmed. UPS spectra on the surface of the palladium-deposited silicon crystal were measured as an application of our method and the change in the surface of the substrate was analyzed in relation to the thermal treatment.

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  • 表面吸着状態における機能性錯体分子の光機能に関する研究

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    Grant type：Competitive

    基板上におけるナノサイズ分子の持つ光機能について、分子設計・合成、高感度光学計測，単一分子レベル構造解析を柱として相互に協力しながら明らかにして行く。特に、光機能材料として期待されている金属錯体に着目し、その基板上での新規な光機能を探ることを目的とする．単一分子計測によるコンフォメーションや分子配列構造の決定、高感度光機能計測などの結果を総合的に解析し，それを分子設計にフィードバックすることで，新たな光機能をもつ金属錯体分子を合成して行く。

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  • 半導体材料に置ける量子ドットの発行ダイナミックス特性

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    Grant type：Competitive

    研究テーマ概要 固体状態物質の光学放射には驚くようなことが残っているかもしれない。インジウム窒化ガリウム(InGaN)のような現代のLED(光を放射する装置)に一般的に使用される物質は不可解な特性を示しました.例えば、私たちは従来の研究で気づきましたが、あるナノメーターサイズの限られた範囲において、光学の信号は「生きています」！それは無秩序な振る舞いを示し、光の強度は、まるでこわれた蛍光灯のように、上下に行ったり来たりします。私たちは明滅を観察するためにCCD付の蛍光顕微鏡をセットアップするつもりです。そして可能なモデルを有効にするために数値計算法を使用します。これはキャリアダイナミックセンシングへの新しいアプローチでありえ、また私たちの学科のナノサイエンスというキーワードにも適合します。

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Teaching Experience

  • Introduction to Quantum Mechanics

    Institution：Yokohama City University

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  • Optical emission

    Institution：Yokohama City University

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  • The Optical Emission in Semiconductors

    Institution：Yokohama National University

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  • Thermodynamics

    Institution：Yokohama City University

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