Location
Kyoto daigaku-Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan
Tel:+81-75-383-2311
Fax:+81-75-383-2312 |
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Welcome to Kawakami laboratory!
In the laboratory of Prof. Kawakami we study the interaction between light and matter; we try to elucidate and possibly discover physics involved in the interaction processes. We promote such studies to finally realize cutting-edge optical devices and applications that dramatically enrich human activities. Three main research lines are pursued:
(1) The development of new measurement techniques for studying nano-scaled optical emission dynamics
(2) The application of the original techniques developed in (1) to nano- and micro-scopic physical properties of materials and biosamples. New biosensors and devices are studied and realized.
(3) We also realized methodologies to modify and control the growth process of crystal structures of optical devices in order to obtain a light source with a desired emission color and a 100% quantum efficiency.
The synthesis of a desired optical spectrum is of course related to the realization of tailor-made solid-state optical devices. The topics in (1) and (2) are naturally linked each other and they both connect to the research line (3). In other words, the development of new materials and the study of their basic optical and physical properties give us a positive feedback on the realization of new devices, applications, and original measurement techniques.
As an application of optical materials, we can suggest bio and medical systems. In the near future we hope to realize micro-machinery able to enter the human body and perform measurements or actions, as was inspired by the 1966 Science Fiction movie "Fantastic Voyage". Our researches point toward the realization of smaller and higher-definition light sources and detection devices that are indispensable elements in such enterprise. Recently we were able to control the spectral emission of optical devices through special growth techniques. This is also promising for the final realization of extremely small light sources that can be used for insertion in the human body.
Finally, we want to understand the basic optical processes related to solid state illumination, for the realization of a new kind of illumination systems. We are pursuing the realization of nanometer sized light sources, highly efficient portable illumination element and optical devices of wide and controllable spectral characteristics. We are involved in this challenging endeavor in the hope to realize novel systems for both medical and technological applications.
- The paper published in Applied Physics Express Vol. 6, No. 11, 111002 (2013) entitled
"Remarkably Suppressed Luminescence Inhomogeneity in a (0001) InGaN Green Laser Structure"
was scored first place in number of monthly downloaded articles of October 2013,
and selected in the Editors' Choice of Applied Physics Express.
- The paper talked at CLEO-PR&OECC/PS 2013 entitled
"Local Photoluminescence Properties of InGaN Green Laser Structure on (0001) GaN Substrate"
was selected in the Best Paper Awards.
- The paper published in rapid communication of Physical Review B Vol. 87, No. 16, paper #161204(R) (2013) entitled
"Huge electron-hole exchange interaction in aluminum nitride"
was selected in the Editors' suggestions of Physical Review B.
- The paper published in rapid communication of Physical Review B Vol. 87, No. 4, paper #041306(R) (2013) entitled
"Strong optical polarization in nonpolar (1-100) AlGaN/AlN quantum wells"
was selected in the Editors' suggestions of Physical Review B.
- "100 mW deep-ultraviolet emission from aluminium-nitride-based quantum wells pumped by an electron beam"
was published in the Nature Photonics (2010).
- The paper published in Nature Photonics Vol. 4, No. 11, pp. 767-770, (2010) entitled
"100 mW deep-ultraviolet emission from aluminium-nitride-based quantum wells pumped by an electron beam"
was introduced in the Research Highlights of Nature asia-pacific Materials.
- "Visualization of the Local Carrier Dynamics in an InGaN Quantum Well Using Dual-Probe Scanning Near-Field Optical Microsocpy"
was published in the Appl. Phys. Express 3, 102102 (2010)
- Profs. M. Funato and Y. Kawakami
"Semipolar III Nitride Semiconductors: Crystal Growth, Device Fabrication, and Optical Anisotropy"
was published in the Materials Research Society (MRS) Bulletin Vol.34, No.5, pp.334-340, (2009).
- The paper published in Appl. Phys. Exp. 1, 011106 (2008) entitled
"Monolithic Polychromatic Light-Emitting Diodes Based on InGaN Microfacet Quantum Wells toward Tailor-Made Solid-State Lighting"
was introduced in the Research Highlights of Nature Photonics.
Nature Photonics vol.2, p.128 (March 2008)
- Profs. Y. Kawakami and M. Funato
Realization of phosphor free polychromatic LEDs. The LEDs emitting multiple colors including white were realized in collaboration with Dr. Yukio Narukawa and Dr. Takashi Mukai of Nichia Corp. Japan.
Details are described in Appl. Phys. Express 1, 011106 (2008)
This topic appeared in many Japanese newspapers, and was broadcasted by the Japanese National TV (NHK).
This topic introduced in the related articles:
Trend in Japan
"Broadening The LED Color Spectrum" New Diode Can Produce White and Intermediate Colors
SPIE Newsroom
"Light-emitting diode design allows precise control of colors and intensity"
Compound Semiconductor, vol.15, No.5, p.14
"Multi-faced LEDs introduce more color"
- Profs. Y. Kawakami, M. Funato and Dr. A. Kaneta
"Assessment and Modification of Recombination Dynamics in InxGa1-xN-Based Quantum Wells"
was published in the Materials Science Forum Vol.590 (2008), Advances in Light Emitting Materials
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- Prof. Y. Kawakami
Invited talk at International Workshop on Luminescent Materials 2013 (LumiMat'13) (Shiran-Kaikan(Annex), Kyoto University, Kyoto, Japan, November 14-15, 2013)
"Impact of crystal orientation on InGaN-based efficient visible light emitters"
- Prof. Y. Kawakami
Invited talk at UV-DUV Plasmonics and Nanophotonics Workshop (UPN2013) (Icho Kaikan, Osaka University, Osaka, Japan, October 28-29, 2013)
- Prof. Y. Kawakami
Invited talk at International Conference on Nitride Semiconductors (ICNS10) (Washington, DC, USA, Aug.25-30, 2013)
"Visualization of Recombination Dynamics in Nitride-based Setniconcluctors"
- Prof. M. Funato
invited talk at CLEO:2013 (San Jose Convention Center, San Jose, CA, USA, Jun. 9-14, 2013)
"Semipolar Faceting for InGaN-based Polychromatic LEDs"
- Dr. R. Ishii
invited talk at E-MRS (Strasbourg, France, May 27-31, 2013 )
"Determination of deformation potentials in GaN and AlN for the design of strained AlGaN-based quantum structures"
R. Ishii, M. Funato, and Y. Kawakami
- Prof. M. Funato
Invited talk at Conference on LED and its industrial application '13 (LEDIA'13) (Pacifico Yokohama, Yokohama, Japan, Apr. 23-25, 2013)
"Impact of crystal orientation on InGaN-based efficient visible light emitters"
- Prof. M. Funato
Invited talk at Collaborative Conference on Crystal Growth (Orlando, Florida, USA, Dec. 11-14, 2012)
"Epitaxial growth of AlN and related alloys"
- Prof. M. Funato
Invited talk at 16th International Conference on Metal Organic Vapor Phase Epitaxy (ICMOVPE XVI) (Paradise Hotel Busan, Busan, Korea, May 20-25, 2012)
"High quality AlGaN-based quantum wells for deep-ultraviolet emitters"
- Prof. M. Funato
Invited talk at International Union of Materials Rsearch Society-International Conference in Asia 2012 (IUMRS-ICA2012) (BEXCO, Busan, Korea, Aug. 26-31, 2012)
"Approaches to efficient visible light emitters using semipolar InGaN quantum wells"
- Prof. Y. Kawakami
Invited talk at International Photonics and OptoElectronics Meetings (POEM2011) (Wuhan, China, Nov.2-5, 2011)
"Visualization of the local carrier dynamics in InGaN SQW using dual probe scanning near field optical microscope"
- Dr. A. Kaneta
Invited talk at SPIE Optics+Photonics 2011, NanoScience+Engineering (San Diego Convention Center, San Diego, California, USA, Aug. 21-25, 2011)
"Local carrier dynamics in InGaN quantum wells studied by scanning near-field optical microscopy"
- Prof. Y. Kawakami
Invited talk at 9th International Conference on Nitride Semiconductors (ICNS-9) (SECC, Glasgow, Scotland, Jul. 10-15, 2011)
"Optical properties of Al-rich AlGaN quantum wells and their application to electron-beam pumped deep-UV emitters"
- Dr. Ryan Banal
Invited talk at 9th International Conference on Materials for Advanced Technologies (ICMAT2011) (Suntec, Singapore, Jun. 26 - Jul. 1, 2011)
"Realization of Highly-efficient Deep-ultraviolet Emitters Based on AlGaN/AlN Quantum Wells"
- Prof. K. Okamoto
Invited talk at Workshop on Information, Nano and Photonics Technology (WINPTech: Kobe University, Dec. 3-4, 2010)
"Plasmonics toward high-efficiency LEDs and solar cells"
- Prof. K. Okamoto
Invited talk at First Symposium Japanese-French Frontiers of Engineering (Grenoble, France, Oct. 10-13, 2010)
"New Applications of Plasmonics toward High-Efficiency Light-Emitting Diodes and Solar Cells"
- Dr. A. Kaneta
Invited talk at International Workshop on Nitride Semiconductor 2010 (IWN2010) (Tampa, FL, USA, Sep. 19-24, 2010)
"Visualization of the Local Carrier Dynamics in InGaN SQW Using Dual Probe Scanning near Field Optical Microscope"
Akio Kaneta, Tsuneaki Hashimoto, Katsuhito Nishimura, Mitsuru Funato, and Yoichi Kawakami
- Mr. R. Ishii
Invited talk atThe 37th International Symposium on Compound Semiconductors (ISCS2010) (Takamatsu, Kagawa, Japan, May 31 - June 4, 2010)
"Impact of breakdown of the quasi-cubic approximation in GaN on the optical polarization properties of nonpolar and semipolar GaN/AlGaN quantum wells"
Ryota Ishi, Akio Kaneta, Mitsuru Funato, Yoichi Kawakami
- Prof. Y. Kawakami
Invited talk at 8th International Symposium on Semiconductor Light Emitting Devices (ISSLED2010) (Peking Univ., Beijing, China, May 16-21, 2010)
"Mapping of efficiency droop in InGaN quantum wells studied by scanning near-field optical microscopy"
- Profs. M. Funato and Y. Kawakami
Invited talk at 3rd GCOE International Symposium on Photonics and Electronics Science and Engineering (Katsura Campus, Kyoto University, March 12th, 2009)
"Approach to the Efficient Light Emitters in Deep-UV with Al-rich AlGaN/AlN Quantum Wells"
- Prof. K. Okamoto
Invited talk at TACT 2009 International Thin Films Conference (Taipei, Taiwan, December 14-16, 2009)
"Surface plasmon coupling at nanostructured metal films and nanoparticles"
- Prof. Y. Kawakami
Invited talk at The 2nd International Confernece on White LEDs and Solid State Lighting(Taipei, Taiwan, December 13-16, 2009)
"Semipolar (11-22)-based InGaN/GaN light emitting diodes"
Y. Kawakami and M. Funato
- Prof. M. Funato
Invited talk at Asia Communications and Photonics Conference and Exhibition(Shanghai, China, November 2-6, 2009)
"Semipolar (11-22)-oriented InGaN/GaN quantum wells"
M. Funato and Y. Kawakami
- Prof. M. Funato
Invited talk at 8th International Conference on Nitride Semiconductors(Jeju, Korea, October 18-23, 2009)
"Polarization anisotropy in semipolar/polar nitride semiconductor quantum wells"
M. Funato and Y. Kawakami
- Prof. Y. Kawakami
Invited talk at E-MRS 2009 Spring meeting (Strasbourg, France, June 8-12, 2009)
"Characterization and control of recombination process in nitride semiconductors"
Authors : Y. Kawakami, A. Kaneta, M. Ueda and M. Funato
- Prof. Y. Kawakami
Invited talk at DPG Conference, (Dresden, Germany, March 22-27 2009)
"Characterization and Control of Recombination Dynamics in Low-dimensional InGaN-based Semiconductors"
Yoichi Kawakami, Akio Kaneta, Masaya Ueda, and Mitsuru Funato
- Profs. M. Funato and Y. Kawakami
Invited talk at 2nd GCOE International Symposium on Photonics and Electronics Science and Engineering (Katsura Campus, Kyoto University, March 13th, 2009)
"Semipolar III-Nitride Semiconductors for Highly Functional Light Emitters"
- Prof. K. Okamoto
Invited talk at Workshop on Nanotechnology and Solar Cells at Mingchi University of Technology (Taipei, March 7th, 2009)
"Surface plasmon enhanced light-emitting and light-receiving devices"
- Profs. M. Funato and Y. Kawakami
Invited talk at SPIE Photonic West(San Jose, California, USA, January 24-29, 2009)
"Multi-color light-emitting diodes based on GaN micro-structures"
- Prof. Y. Kawakami
Ivited talk at The 3rd Int'I Conference on Display & Solid State Lighting, DSSL2009(Seoul, Korea, January 20-22, 2009)
"Monolithic Polychromatic InGaN Light-Emitting Diodes Based on Micro-facet Structures"
- Profs. Y. Kawakami and M. Funato
Invited talk at The 8th International Meeting on Information Display, International Display Manufacturing Conference 2008, and Asia Display 2008 (IMID/IDMC/ASIA DISPLAY 2008) (Ilsam, Korea, October 13-17, 2008)
"Monolithic Polychromatic InGaN LEDs based on Micro-facet Structures"
- PhD student, M. Ueda
Invited talk at International Workshop on Nitride Semiconductors (Montreux, Switzerland, October 6-10, 2008)
"Polarization anisotropy in semipolar InGaN/GaN quantum well active layers"
Program No.
WS5-Opto 1:Materials and physics
Session Th5-E-Optical characterization II, October 9, 2008, 8:30-9:00
- Prof. K. Okamoto
Invited talk at 2008 Japan-US Nanophotonics Seminar (Miyazaki, Japan, September 23-27, 2008)
"Highly efficient light emission based on plasmonics"
- Prof. K. Okamoto
Invited talk at 2nd International Conference on Functional materials and Devices 2008 (Kuala Lumpur, Malaysis, June 16 -19, 2008)
"Surface plasmon enhanced highly efficient light-emitting devices"
- Prof. Y. Kawakami
Invited talk at The 3rd International Conference "Smart Materials, Structures and Systems"(Asireale, Sicily, Italy, June 8-13, 2008)
"Characterization and Control of Recombination Dynamics in Low-dimensional InGaN-based Semiconductors"
- Prof. K. Okamoto
Invited talk at JSPS-UNT Winterschool on Nanophotonics (University of North Texas, Denton, USA, February 14-15, 2008)
"Surface plasmon enhanced Solid-State Light-Emitters"
- Prof. K. Okamoto
Invited talk at The 9th RIES-Hokudai International Symposium (Hokkaido University, Sapporo, Japan, January 28 -29, 2008)
"Highly efficient light emission based on surface plasmon coupling"
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