AKAI Ichiro

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Name
AKAI Ichiro
URL
http://pltop.shocomarec.kumamoto-u.ac.jp/index-j.html
Affiliation
Kumamoto University
Section
Institute of Pulsed Power Science
Job title
Professor
Degree
Doctor of Science(Osaka City University), Master of Science(Osaka City University)
Research funding number
20212392

Research Areas

 
 

Academic & Professional Experience

 
2007
 - 
2013
 Professor, ,Shock Wave and Condensed Matter Research Center,Kumamoto University
 
2013
   
 
 Professor, , ,Kumamoto University
 
1989
 - 
1996
 Research Associate,Osaka City University
 
1996
 - 
1999
 Lecturer,Osaka City University
 
1999
 - 
2001
 Associate Professor,Osaka City University
 
2001
 - 
2007
 Associate Professor,Osaka City University
 

Education

 
 
 - 
1987
Graduate School, Division of Natural Science, Osaka City University
 
 
 - 
1985
Department of Physics, Faculty of Science, Osaka City University
 

Published Papers

 
Bayesian spectroscopy on polarization dependent photoluminescence spectra of doubly-split excitons in a Cu2O thin-crystal sandwiched by MgO substrates
A. Kiridoshi, S. Aihara, S. Arishima, T. Yamashiro, M. Mizumaki, K. Iwamitsu, I. Akai
physica status solidi (b)      Jul 2018   [Refereed]
Ichiro Akai, Ichiro Akai, Kazunori Iwamitsu, Yasuhiko Igarashi, Yasuhiko Igarashi, Yasuhiko Igarashi, Masato Okada, Masato Okada, Hiroyuki Setoyama, Toshihiro Okajima, Yasuharu Hirai
Journal of the Physical Society of Japan   87 074003/1-074003/7   Jun 2018   [Refereed]
©2018 The Physical Society of Japan. We propose a new method for the analysis of extended X-ray absorption fine structures (EXAFSs), by the application of sparse modeling using simplified basis functions based on the single-scattering approximatio...
Iwamitsu Kazunori, Furukawa Yoshiaki, Nakayama Masaaki, Okada Masato, Akai Ichiro
JOURNAL OF LUMINESCENCE   197 18-22   May 2018   [Refereed]
S. Murata, S. Aihara, S. Tokuda, K. Iwamitsu, K. Mizoguchi, I. Akai, M. Okada
J. Phys. Soc. Japan   87(4)    Mar 2018   [Refereed]
I. Akai, K. Iwamitsu, M. Okada
Journal of Physics: Conference Series      2018   [Refereed]
S. Aihara, M. Hamamoto, K. Iwamitsu, M. Okada, I. Akai
AIP Advances   7    Apr 2017   [Refereed]
? 2017 Author(s). By Bayesian inference with Metropolis algorithm, we have succeeded highly accurate estimation of a vibrational frequency as well as an initial phase for a damped oscillation contained in coherent phonon signals. Although a rise a...
Iwamitsu Kazunori, Aihara Shingo, Okada Masato, Akai Ichiro
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   85(9)    Sep 2016   [Refereed]
Iwamitsu Kazunori, Hatada Kyosuke, Ichigozaki Syou, Hatada Naoki, Shimamoto Tomoshige, Akai Ichiro, Serov Aleksei Yu., Filosofov Nikolai G., Karczewski Grzegorz, Agekian Vadim F.
JOURNAL OF LUMINESCENCE   169 665-668   Jan 2016   [Refereed]
S. Aihara, A. Ota, K. Iwamitsu, K. Iwamitsu, F. Ichikawa, H. Isobe, T. Shimamoto, I. Akai
Journal of Luminescence   167 211-215   Jul 2015   [Refereed]
? 2015 Elsevier B.V. Abstract We investigated biaxial stress effects on the yellow 1S ortho excitons in Cu < inf > 2 < /inf > O thin films recrystallized between paired MgO plates by measuring photoluminescence spectra, X-ray diffraction and polar...
Iwamitsu Kazunori, Aihara Shingo, Ota Akinobu, Ichikawa Fusao, Shimamoto Tomoshige, Akai Ichiro
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN   83(12) 1-147427   Dec 2014   [Refereed]
? 2014 The Physical Society of Japan. We investigated the stress effects on nP yellow excitons in Cu 2 O thin films recrystallized epitaxially in a sample gap between paired MgO substrates. In such samples, it is expected that a two-dimensional co...
Iwamitsu Kazunori, Aihara Shingo, Shimamoto Tomoshige, Fujii Atsuhiro, Akai Ichiro
EUROPEAN PHYSICAL JOURNAL B   86(5) 1-6   May 2013   [Refereed]
We have investigated stress effects on yellow exciton states in a Cu 2 O thin film sandwiched by MgO plates by measuring wavelength modulated (WM) absorption spectra and their thermal variations. In the WM absorption spectra, dispersive spectral s...
Iwamitsu Kazunori, Aihara Shingo, Shimamoto Tomoshige, Fujii Atsuhiro, Akai Ichiro
PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 9, NO 12   9(12) 2489-2492   Dec 2012   [Refereed]
In order to clarify uniaxial stress effects on a green excitonic series in Cu 2 O, we measured temperature dependence of wavelength modulated (WM) absorption spectra of a Cu 2 O thin film sandwiched by MgO plates. In these spectra, excitonic reson...
Konishi Syunya, Nagatomo Yusuke, Iwamitsu Kazunori, Shimamoto Tomoshige, Fujii Atsuhiro, Akai Ichiro
PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 9, NO 12   9(12) 2509-2512   Dec 2012   [Refereed]
We investigated high density excitation effects in propagation and diffusion processes of free excitons confined in an L z -gradient GaAs quantum well (QW). From measurements of μPL spectra, it was found that driving force owing to a confined-ener...
K. Iwamitsu, S. Aihara, T. Shimamoto, A. Fujii, I. Akai
Review of Scientific Instruments   83(7)    Jul 2012   [Refereed]
We developed a newly designed wavelength modulation (WM) system for highly sensitive absorption spectroscopy. In our system, the WM is realized by yawing an output mirror in a monochromator. In order to control an amplitude Δλ of the WM in a wide ...
K. Iwamitsu, S. Aihara, A. Ota, Y. Yoshizaki, T. Shimamoto, A. Fujii, I. Akai
Physics Reports of Kumamoto University   14(1) 41-51   2012
We investigated temperature dependence of wavelength modulated (WM) absorptionspectra for studying stress effects on a Cu2O thin film. In these spectra, 2P?4P spectralstructures can be clearly detected in both yellow and green excitons even at 180...
Kanemoto Katsuichi, Yasui Motoaki, Higuchi Tatsuya, Kosumi Daisuke, Akai Ichiro, Karasawa Tsutomu, Hashimoto Hideki
PHYSICAL REVIEW B   83(20) 1-205203   May 2011   [Refereed]
Excitons, photocarriers, and bias-induced carriers in regioregular poly(3-alkylthiophene) (P3AT) films were investigated using a variety of spectroscopic techniques, such as continuous-wave- (cw-) and femtosecond (fs-) transient photoinduced absor...
Ohmura Satoshi, Koga Shiro, Akai Ichiro, Shimojo Fuyuki, Kalia Rajiv K., Nakano Aiichiro, Vashishta Priya
APPLIED PHYSICS LETTERS   98(11) 113302   Mar 2011   [Refereed]
Synthetic supermolecules such as π -conjugated light-harvesting dendrimers efficiently harvest energy from sunlight, which is of significant importance for the global energy problem. Key to their success is rapid transport of electronic excitation...
Shimamoto Tomoshige, Miyanari Kuniaki, Fujii Atsuhiro, Akai Ichiro, Kimura Mutsumi
PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 8, NO 1   8(1) 58-61   Jan 2011   [Refereed]
From analyses of molecular vibrations, we have studied rapid energy transfer (ET) process in a series of star-shaped stilbenoid phthalocyanines (SSSnPc;n=1,2) having π-conjugated light harvesting antennas. In SSSnPc, the highly efficient ET occurs...
Akai Ichiro, Miyanari Kuniaki, Shimamoto Tomoshige, Fujii Atsuhiro, Kimura Mutsumi
PHYSICA STATUS SOLIDI C: CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 8, NO 1   8(1) 155-158   Jan 2011   [Refereed]
We investigated rapid energy transfer (ET) processes in dendrimers having meta -linked branching light harvesting antennas. It was found that, at room temperature (RT), the rapid ET occurs efficiently from the antennas to the core and gives rise t...
Kanemoto Katsuichi, Ogata Akihiko, Inoue Nobuyuki, Kusumoto Toshiyuki, Hashimoto Hideki, Akai Ichiro, Karasawa Tsutomu
APPLIED PHYSICS LETTERS   97(3) 33307   Jul 2010   [Refereed]
We have performed spectroscopic measurements combining with the diode operation of [6,6]-phenyl C61 butyric acid methyl ester (PCBM) for directly characterizing the nature of its n -carriers. The measurements in the visible region reveal that elec...
Shimamoto Tomoshige, Miyanari Kuniaki, Fujii Atsuhiro, Akai Ichiro, Kimura Mutsumi
Physics reports of the Kumamoto University   13(2) 341-348   2010
Akai Ichiro, Miyanari Kuniaki, Shimamoto Tomoshige, Fujii Atsuhiro, Kimura Mutsumi
Physics reports of the Kumamoto University   13(2) 333-340   2010
We investigated rapid energy transfer (ET) processes in dendrimers having meta-linked branching light harvesting antennas. It was found that, at room temperature (RT), the rapid ET occurs efficiently from the antennas to the core and gives rise to...
A. Yamada, A. Ishida, I. Akai, M. Kimura, I. Katayama, J. Takeda
Journal of Luminescence   129 1898-1900   Dec 2009   [Refereed]
Rapid energy transfer dynamics in light-harvesting small dendrimers (star-shaped stilbenoid phthalocyanine: SSS2Pc-m, m=1,2) having different numbers of oligo(p-phenylenevinylene) periphery antennas was studied by time-frequency two-dimensional (2...
Kanemoto Katsuichi, Sugisaki Mitsuru, Hashimoto Hideki, Akai Ichiro, Karasawa Tsutomu, Negishi Nobukazu, Aso Yoshio
JOURNAL OF LUMINESCENCE   129(12) 1845-1848   Dec 2009   [Refereed]
Kanemoto Katsuichi, Yasui Motoaki, Kosumi Daisuke, Ogata Akihiko, Sugisaki Mitsuru, Karasawa Tsutomu, Akai Ichiro, Hashimoto Hideki
PHYSICAL REVIEW LETTERS   103(18) 1-187402   Oct 2009   [Refereed]
Bleaching probe spectroscopy performed for regioregular poly(3-hexylthiophene) diodes reveals that coexistent morphological phases determine the conducting and optical properties of conjugated polymer films. Photoinduced absorption measurements de...
Kanemoto Katsuichi, Akai Ichiro, Sugisaki Mitsuru, Hashimoto Hideki, Karasawa Tsutomu, Negishi Nobukazu, Aso Yoshio
JOURNAL OF CHEMICAL PHYSICS   130(23) 234909   Jun 2009   [Refereed]
Temperature dependences (4-300 K) of photoluminescence (PL) and absorption spectra of 16-mer oligothiophene (16 T) extremely diluted in polypropylene (PP) have been investigated in order to clarify temperature effects on quasi-isolated conjugated ...
Kawai Taketoshi, Akai Ichiro, Ichida Hideki, Kanematsu Yasuo, Mizoguchi Kohji, Karasawa Tsutomu
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS   246(6) 1327-1333   Jun 2009   [Refereed]
Decay kinetics of the luminescence of Ag - centers doped in NaCl, KBr, and CsBr single crystals have been investigated in the temperature range from 4 K to 260 K. At low temperature, the radiative transitions from the 1 T 1u states in the Ag - ...
Kanemoto Katsuichi, Akai Ichiro, Hashimoto Hideki, Karasawa Tsutomu, Negishi Nobukazu, Aso Yoshio
PHYSICA STATUS SOLIDI C - CURRENT TOPICS IN SOLID STATE PHYSICS, VOL 6, NO 1   6(1) 193-+   Apr 2009   [Refereed]
The temperature dependence (4 K-300 K) of the photoluminescence (PL) and absorption spectra of 16-mer oligothiophene (16T) diluted in polypropylene (PP) with a weight ratio of 1/30000 has been investigated in order to clarify the intrinsic tempera...
I. Akai, I. Akai, K. Miyanari, T. Shimamoto, A. Fujii, H. Nakao, A. Okada, K. Kanemoto, T. Karasawa, A. Ishida, A. Yamada, L. Katayama, J. Takeda, M. Kimura
Physica Status Solidi (C) Current Topics in Solid State Physics   6(1) 77-80   Apr 2009   [Refereed]
We investigate a rapid energy transfer (ET) process and its temperature dependence in a star-shaped stilbenoid phthalocyanine (SSS1Pc) dendrrimer having πconjugated light-harvesting (LH) antennas. In SSS1Pc, intense core-photoluminescence is obser...
Akai Ichiro, Miyanari K., Shimamoto T., Fujii A., Nakao H., Okada A., Kanemoto K., Karasawa T., Ishida A., Yamada A., Katayama I., Takeda J., Kimura M.
Physica status solidi. C   6(1) 77-80   Jan 2009
We investigate a rapid energy transfer (ET) process and its temperature dependence in a star-shaped stilbenoid phthalocyanine(SSS1Pc) dendrimer having π-conjugated light-harvesting (LH) antennas. In SSS1Pc, intense corephotoluminescenceis observed...
Akai Ichiro, Miyanari K., Shimamoto T., Fujii A., Nakao H., Okada A., Kanemoto K., Karasawa T., Hashimoto H., Ishida A., Yamada A., Katayama I., Takeda J., Kimura M.
New Journal of Physics   10    Dec 2008
We investigate rapid energy transfer (ET) and its temperature dependence in a star-shaped stilbenoid phthalocyanine (SSS1Pc) dendrimer having π-conjugated light-harvesting (LH) antennas, and develop an appropriate model. In SSS1Pc, an intense core...
A. Ishida, Y. Makishima, A. Okada, I. Akai, K. Kanemoto, T. Karasawa, M. Kimura, J. Takeda
Journal of Luminescence   128(5月6日) 771-773   May 2008   [Refereed]
Rapid energy transfer dynamics in light-harvesting small dendrimers (star-shaped stilbenoid phthalocyanine: SSS1-Pc) having oligo (p-phenylenevinylene) peripheries was studied by real-time pump-probe imaging spectroscopy implemented on a single-sh...
Akai Ichiro, Shimamoto Tomoshige, Fujii Atsuhiro, Kanemoto Katsuichi, Karasawa Tsutomu, Hashimoto Hideki, Katayama Ikufumi, Takeda Jun, Kimura Mutsumi
Physics reports of the Kumamoto University   13(1) 115-136   2008
Akai Ichiro, Higuchi Masayuki, Kanemoto Katsuichi, Karasawa Tsutomu, Hashimoto Hideki, Kimura Mutsumi
Journal of Luminescence   128(5) 948-951   2008
Energy transfer and shielding effect are studied in wire-type dendrimers (GnPPV: n-thgeneration dendrimer with poly(p-phenylenevinylene) backbone; n = 1, 2) havingoligophenylene light-harvesting (LH) antenna. Following the excitation of the LH-ant...
Kanemoto Katsuichi, Imanaka Yoshitaka, Akai Ichiro, Sugisaki Mitsuru, Hashimoto Hideki, Karasawa Tsutomu
JOURNAL OF PHYSICAL CHEMISTRY B   111(43) 12389-12394   Nov 2007   [Refereed]
The photoluminescence (PL) dynamics of poly[2-methoxy-5-(2′-ethyl- hexyloxy)-1,4-phenylene vinylene] (MEH-PPV) blended in host polymer (polypropylene, PP) matrix as well as that in the neat film has been studied. The concentration of MEH-PPV in th...
V. F. Agekyan, I. Akai, N. G. Filosofov, T. Karasawa, G. Karczewski, A. Yu Serov, N. N. Vasiliev
Physica Status Solidi (B) Basic Research   244(9) 3265-3270   Sep 2007   [Refereed]
The effect of excitation level on the luminescence of ZnMnTe/ZnMgTe quantum-well (QW) structures has been studied. We find that result depend strongly on the QW width and manganese concentration. The increasing optical pumping implies a degradatio...
V. F. Agekyan, I. Akai, N. N. Vasil'ev, T. Karasawa, G. Karczewski, A. Yu Serov, N. G. Filosofov
Physics of the Solid State   49(6) 1175-1183   Jun 2007   [Refereed]
The emission spectra of Zn 1-x Mn x Te/Zn 0.6 Mg 0.4 Te and Cd 1-x Mn x Te/Cd 0.5 Mg 0.5 Te quantum-well structures with different manganese concentrations and quantum-well widths are studied at excitation power densities ranging from 10 5 to 10 7...
Kawai Taketoshi, Akai Ichiro, Karasawa Tsutomu, Hashimoto Satoshi
JOURNAL OF PHYSICS-CONDENSED MATTER   19(13) 1-9   Apr 2007   [Refereed]
Luminescence properties including decay kinetics have been investigated for Ag - centres doped in NaCl single crystals in the temperature range from 7 to 250K. When the C absorption band peaking at 4.5eV is photo-excited at low temperature, the A...
I. Akai, T. Kato, A. Okada, K. Kanemoto, T. Karasawa, M. Kimura, M. Ohashi, S. Shinoda, H. Tsukube
Physica Status Solidi (C) Current Topics in Solid State Physics   3(10) 3414-3419   Dec 2006   [Refereed]
The temperature dependence of excitonic energy transfer is investigated in both small and large dendrimers having meta-linked light-harvesting peripheries. In these dendrimers, highly efficient excitonic energy transfer takes place from peripherie...
I. Akai, T. Kato, K. Kanemoto, T. Karasawa, M. Ohashi, S. Shinoda, H. Tsokube
Physica Status Solidi (C) Current Topics in Solid State Physics   3(10) 3420-3425   Dec 2006   [Refereed]
Morphology dependence of excitonic energy transfer in light-harvesting dendrimers (4thmQ: m = 1, 3, and 4) with fourth branching generation is investigated from the measurements of photoluminescence (PL) spectra and the 1 H-NMR spin-spin relaxati...
Ichiro Akai, Akira Okada, Katsuichi Kanemoto, Tsutomu Karasawa, Hideki Hashimoto, Hideki Hashimoto, Mutsumi Kimura, Mutsumi Kimura
Journal of Luminescence   119 283-287   Jul 2006   [Refereed]
Temperature dependence of the energy-transfer dynamics in a light-harvesting small dendrimer (star-shaped stilbenoid phthalocyanine: SSS1Pc) having oligo (p-phenylenevinylene) peripheries is investigated. We measured stationary and time-resolved p...
Katsuichi Kanemoto, Tatsuji Sudo, Ichiro Akai, Hideki Hashimoto, Hideki Hashimoto, Tsutomu Karasawa, Yoshio Aso, Tetsuo Otsubo
Physical Review B - Condensed Matter and Materials Physics   73(23) 1-235203   Jun 2006   [Refereed]
The intrinsic intrachain photoluminescence (PL) dynamics of conjugated polymers in the solid state is investigated. We focus on the PL properties of long β -substituted oligothiophenes (8-mer, 12-mer, and 16-mer) and regio-regular (RR) and regio-r...
Katsuichi Kanemoto, Makoto Shishido, Tatsuji Sudo, Ichiro Akai, Tsutomu Karasawa, Yasuyuki Agari
Synthetic Metals   155(1) 162-167   Oct 2005   [Refereed]
Optical properties on the basis of absorption and photoluminescence (PL) have been examined for regioregular (RR-) poly(3-octylthiophene) (P3OT) and regiorandom (RRa-) P3OT diluted in polypropylene (PP). RR-P3OT gives blue-shifted spectra in both ...
Haiyan Xie, Isamu Kinoshita, Tsutomu Karasawa, Kentarou Kimura, Takanori Nishioka, Ichiro Akai, Katsuichi Kanemoto
Journal of Physical Chemistry B   109(19) 9339-9345   May 2005   [Refereed]
The structure of hexanuclear 6-methyl-2-pyridinethiolato copper(I) [Cu 6 (6-mpyt) 6 ] crystals has been studied by the X-ray diffraction analysis. These crystals show highly efficient luminescence whose color changes drastically from red to green...
I. Akai, H. Nakao, K. Kanemoto, T. Karasawa, H. Hashimoto, H. Hashimoto, M. Kimura, M. Kimura
Journal of Luminescence   112(1月4日) 449-453   Apr 2005   [Refereed]
The energy-transfer dynamics from peripheries to cores was investigated in two series of light-harvesting small dendrimers. In a star-shaped stilbenoid phthalocyanine having π-conjugated peripheries, a highly efficient and rapid energy transfer oc...
Katsuichi Kanemoto, Makoto Shishido, Tatsuji Sudo, Ichiro Akai, Hideki Hashimoto, Hideki Hashimoto, Tsutomu Karasawa
Chemical Physics Letters   402(4月6日) 549-553   Feb 2005   [Refereed]
We have investigated the photoluminescence (PL) characteristics of poly(3-octylthiophene) (P3OT) diluted in a solid matrix of polypropylene (PP). Using time-resolved PL spectroscopy, we have identified a continuous increase in PL quantum efficienc...
I. Akai, K. Harai, K. Kouno, T. Karasawa
Journal of Luminescence   108(1月4日) 11-14   Jun 2004   [Refereed]
Heat generation caused by nonradiative relaxation processes in tris-8-hydroxyquinoline aluminum (Alq 3 ) was measured at 2 K by using a photocalorimetric (PC) detecting system. At lower temperatures, the photoluminescence (PL) quantum yield is muc...
Haiyan Xie, M. Tougezaka, S. Oishi, I. Kinoshita, K. Kanemoto, I. Akai, T. Karasawa
Journal of Luminescence   108(1月4日) 91-95   Jun 2004   [Refereed]
Three kinds of luminescent crystals, copper(I) cluster compounds with different ligand configurations (hexanuclear methylpyridinethiolato-copper(I): [Cu 6 (n L -mpyt) 6 ]; n L being the ligand configuration), have been investigated by observing th...
V. F. Agekyan, Yu A. Stepanov, I. Akai, T. Karasava, L. E. Vorob'ev, D. A. Firsov, A. E. Zhukov, V. M. Ustinov, A. Zeilmeyer, S. Shmidt, S. Hanna, E. Zibik
Semiconductors   38(5) 565-571   May 2004   [Refereed]
Luminescence spectra of doped and undoped GaAs/GaAlAs and InGaAs/GaAs/GaAlAs structures containing several tens of stepped quantum wells (QW) are investigated. The emission bands related to free and bound excitons and impurity states are observed ...
Atsushi Tanji, Xie Hai Yan, Ichiro Akai, Tsutomu Karasawa, Vadim F. Aguekian
Journal of the Physical Society of Japan   72(10) 2646-2655   Oct 2003   [Refereed]
Dynamical processes of high-density excitons and their relaxation mechanisms in GaSe crystals have been investigated in real and momentum spaces by observing resonant luminescence spectra of the excitons in the time- and space-resolved regimes. Te...
V. F. Agekyan, I. Akai, T. Karasawa
Physics of the Solid State   45(6) 1170-1176   Jun 2003   [Refereed]
Microcrystals of iodates of mercury, lead, thallium, and bismuth were grown in pores of glass and polymer matrices from solutions or through sublimation in vacuum. Images of these microcrystals embedded in matrices were obtained with an electron m...
T. Karasawa, A. Tanji, I. Akai
Phase Transitions   75(7月8日) 707-714   Jan 2002   [Refereed]
Photoinduced high-density phase of exciton-polariton masses excited at a two-dimensional stacking fault interface in BiI 3 has been studied by observing the degenerate four-wave-mixing (DFWM) signals. It was found that the increase in the dephasin...
K. Bando, K. Bando, I. Akai, T. Karasawa, K. Maehashi, H. Nakashima
Phase Transitions   75(7月8日) 1011-1017   Jan 2002   [Refereed]
In Al x Ga 1-x As/AlAs quantum wire (QWR) structures, the lower lying indirect exciton (IE) photoluminescence (PL) peak shows remarkable blue-shift under intense light-excitation contrary to the higher lying direct exciton (DE) PL band with very s...
Y. Shirasaka, A. Tanji, I. Akai, T. Karasawa
Journal of Luminescence   94 433-436   2002   [Refereed]
Spatial correlation of a quantum coherence of weakly interacting stacking fault excitons (SFEs) excited heavily at a two-dimensional stacking fault interface in BiI 3 has been studied by performing the degenerate four-wave-mixing (DFWM) measuremen...
A. Tanji, I. Akai, T. Karasawa, V. F. Aguekian
Journal of Luminescence   94 365-368   2002   [Refereed]
Spatial evolution of heavily photo-created excitons in GaSe single crystals has been studied by observing space- and time-resolved photoluminescence. At an early stage, the free-exciton recombination band shows a blue-shift with broadening due to ...
K. Bando, I. Akai, T. Karasawa, K. Maehashi, H. Nakashima
Journal of Luminescence   94 389-392   2002   [Refereed]
Under intense light excitation, dynamical processes on indirect and direct excitons (DEs) at high density in Al x Ga 1-x As/AlAs quantum wire (QWR) structures have been investigated. The high density effects are characterized by the spectral blue-...
Y. Kawasumi, I. Akai, T. Karasawa
International Journal of Modern Physics B   15 3825-3828   Dec 2001   [Refereed]
The relaxation dynamics of photo-excited states in single crystals of Alq 3 , utilized as organic electroluminescent (EL) devices, have been investigated. The photoluminescence (PL) peak of Alq 3 changes depending on the exciting photon energy and...
Y. Shirasaka, H. Mino, T. Kawai, I. Akai, T. Karasawa
International Journal of Modern Physics B   15 3960-3964   Dec 2001   [Refereed]
Spatial behavior of the stacking fault excitons (SFE's) excited heavily in a two-dimensional space at a stacking fault interface in Bil 3 has been studied. The SFE's whose center-of mass motion is confined at the interface show more efficient spa...
K. Bando, I. Akai, T. Karasawa, K. Inoue, H. Nakashima
International Journal of Modern Physics B   15 3757-3760   Dec 2001   [Refereed]
High density excitation effects on excitons in Al x Ga 1-x As/AlAs (x=0.2?0.5) quantum wires (QWRs) have been investigated. In these samples, the difference between the type-I (x?0.3) and type-II (x?0.4) band structures was clearly observed in hig...
H. Mino, M. Yamamoto, T. Kawai, I. Akai, T. Karasawa
Journal of Luminescence   87/89 278-280   Jan 2000   [Refereed]
Spatial and temporal behavior of excitons heavily excited in a quasi-two-dimensional space of a stacking fault interface in BiI 3 has been studied by space- and time-resolved luminescence measurements. The luminescence spectra show the peak-energy...
M. Yamamoto, H. Mino, I. Akai, T. Karasawa, V. F. Aguekian
Journal of Luminescence   87/89 275-277   Jan 2000   [Refereed]
High-density effects on the exciton states in a layered GaSe single crystal have been studied by observing photo-luminescence and degenerate four-wave-mixing (DFWM) signals. The luminescence peak of the lowest exciton states shifts from lower ener...
A. Tanji, I. Akai, K. Kojima, T. Karasawa, T. Komatsu
Journal of Luminescence   87/89 516-518   Jan 2000   [Refereed]
Quantum confinement effects and nonlinear luminescence of excitons in CuI microcrystallites on the substrates of poly-methyl methacrylate have been studied. Exciton transitions due to the hexagonal structure appear in the disk-shaped microcrystall...
H. Mino, T. Kawai, I. Akai, T. Karasawa
Journal of Luminescence   76-77 109-112   Feb 1998   [Refereed]
Spatial behavior of excitons at high density was studied in a specific exciton system at a quasi-two-dimensional planar defect in layered BiI 3 crystals. Space- and time-resolved resonance luminescence spectra of the exciton slate shows clear blue...
H. Kondo, H. Mino, I. Akai, T. Karasawa
Physical Review B - Condensed Matter and Materials Physics   58 13835-13846   Jan 1998   [Refereed]
We study spatial behavior of heavily excited excitons localized at a two-dimensional space of a specific stacking fault interface in a layered crystal (Formula presented) Pump-and-probe absorption and resonant luminescence spectra of the exciton s...
T. Karasawa, T. Kawai, H. Mino, I. Akai, T. Komatsu
Journal of Luminescence   72-74 876-878   Jun 1997   [Refereed]
We present transport properties of excitons at high density in a quasi-two-dimensional space of a specific stacking disorder interface in layered crystal BiI 3 , observing temporal behavior and peak energy shifts in space- and time-resolved lumine...
T. Komatsu, T. Karasawa, I. Akai, T. Iida
Journal of Luminescence   70 448-467   Oct 1996   [Refereed]
The optical response of excitons confined in characteristic nanostructures in layered metal tri-iodide crystals introduced by some irregular stackings from the bulk structures is reviewed. In BiI 3 a specific stacking fault takes place during crys...
T. Karasawa, I. Akai, T. Kawai, H. Kondo, H. Mino, T. Komatsu
Progress in Crystal Growth and Characterization of Materials   33(1月3日) 97-100   Jan 1996   [Refereed]
Macroscopic and efficient spreading of excitons from an exciting laser spot to the outside area along a quasi two-dimensional space of a planar-defect in BiI 3 is presented by space- and time-resolved photoluminescence, and the degenerate Four-Wav...
T. Komatsu, D. Kim, T. Kobayashi, K. Watanabe, V. F. Aguekian, T. Karasawa, I. Akai, T. Iida
Surface Review and Letters   3 1127-1131   Jan 1996   [Refereed]
The size effects on the exciton absorption and luminescence spectra are studied in nanostructure of BiI 3 embedded in the matrices of bulk BiI 3 and CdI 2 crystals. The quantum-confined exciton states are observed as the absorption lines of the se...
H. Kondo, T. Kawai, T. Karasawa, I. Akai, T. Komatsu
Journal of Luminescence   66/67(1月6日) 448-452   Dec 1995   [Refereed]
Macroscopic exciton transport phenomena from a small area of an exciting laser spot to outside the spot along a quasi-two-dimensional planar defect in BiI 3 , are presented from space-resolved pump-probe absorption, photoluminescence, and four-wav...
D. Kim, T. Karasawa, I. Akai, T. Komatsu, T. Kobayashi
Journal of Luminescence   66/67(1月6日) 443-447   Dec 1995   [Refereed]
Microcrystallites and ultra-thin films of BiI 3 embedded in CdI 2 crystals were prepared by the melt-growth method and the hot wall technique. Absorption spectra and Stokes-shifted photoluminescence bands of the excitons confined in those are pres...
T. Komatsu, E. Kawahata, T. Karasawa, I. Akai, V. F. Aguekian, M. Nakayama, K. Uchida, N. Miura
Journal of Luminescence   66-67 468-472   Dec 1995   [Refereed]
The magnetic field dependence of exciton photoluminescence intensity was investigated in GaAs/AlGaAs superlattice and quantum well structures for high magnetic fields up to 40 T. We discuss the observed large magnetic field effects in terms of the...
Ichiro Akai, Tsutomu Karasawa, Teruo Komatsu, Sadayuki Iwai, Keiichi Edamatsu, Tadashi Itoh, Satoshi Yano, Takenori Goto
Japanese Journal of Applied Physics   34 113-115   Jan 1995   [Refereed]
We report the optical nonlinear response of the confined excitons in nanostructures induced by external stress in a layered crystal BiI 3 . The absorption intensity of the confined excitons is saturated by intense laser excitation. We clarify the ...
H. Kurisu, T. Komatsu, T. Tanaka, I. Akai, T. Karasawa, T. Iida
Journal of Luminescence   60/61 816-818   Apr 1994   [Refereed]
Raman absorption of the exciton and luminescence from self-trapped exciton in SbI 3 and BiI 3 have been investigated under hyrostatic pressure. The difference in the nature of intra-layer bonding between these materials brings about the difference...
H. Kondo, T. Karasawa, I. Akai, M. Ichida, T. Komatsu
Journal of Luminescence   60/61 658-660   Jan 1994   [Refereed]
The high density effects of excitons excited at a two-dimensional stacking-fault plane in layered BiI 3 crystal is investigated. The blue-shift and broadening have been observed for the high density excitation. A new transition appears below the r...
H. Kurisu, T. Komatsu, T. Tanaka, I. Akai, T. Karasawa, T. Iida
Journal of Luminescence   60-61 812-815   Jan 1994   [Refereed]
Raman absorption of the exciton and luminescence from self-trapped exciton in SbI 3 and BiI 3 have been investigated under hyrostatic pressure. The difference in the nature of intra-layer bonding between these materials brings about the difference...
I. Akai, H. Kondo, M. Ichida, T. Karasawa, T. Komatsu
Journal De Physique. IV : JP   3 433-436   Oct 1993   [Refereed]
Saturation spectra of the excitons confined and localized at several kinds of stacking disorders in layered crystal BiI 3 are studied. The quasi-two dimensional exciton localized at the stacking fault interface does not saturate its absorption str...
Vadim F. Aguekian, Y. A. Stepanov, Ichirou Akai, Tsutomu Karasawa, Teruo Komatsu
Journal of the Physical Society of Japan   62(12) 4516-4521   Jan 1993   [Refereed]
The exciton spectra of Sn02 single crystals with the low and high concentrations of the oxygen vacancies (OV) are investigated. The series of luminescence lines adjacent to the lowest free exciton states (the excitons localized by the isolated OV ...
T. Komatsu, T. Iida, K. Murayama, M. Ichida, H. Kurisu, H. Kondo, I. Akai, T. Karasawa
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals   218 37-42   Jun 1992   [Refereed]
Absorption line series W J (J=I,II,III,…) appeared below the indirect edge in BiI 3 has been studied. The series is assigned to the excitons confined in mesoscopic domains produced by deformation faults characteristic of layered materials. Each li...
I. Akai, K. Nakajima, T. Karasawa, M. Ichida, T. Komatsu
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals   218 25-30   Jun 1992   [Refereed]
We report the picosecond time resolved spectra of the optical Stark effect on a quasi-two-dimensional exciton localized at a stacking fault plane in Bil 3 crystals. The ultrafast response of the blue-shift due to the optical Stark effect(OSE) is c...
T. Karasawa, M. Ichida, I. Akai, T. Komatsu
Applied Physics A Solids and Surfaces   53(6) 480-490   Dec 1991   [Refereed]
On the exciton states localized at a two-dimensional stacking fault interface in a layered crystal BiI 3 , some nonlinear optical phenomena clearly appear reflecting large transition probability. The optical Stark shift and other high density exci...
T. Kawai, S. Shimanuki, T. Karasawa, I. Akai, T. Iida, T. Komatsu
Journal of Luminescence   48-49    Jan 1991   [Refereed]
Fast and ballistic spreading of excitons excited at the stacking fault interface in BiI 3 crystals was observed in the temporal behavior of exciton luminescence with space- and time-resolved measurements. The spreading velocity reaches ?7 × 10 8 c...
I. Akai, T. Karasawa, T. Komatsu, Y. Kaifu
Physical Review B   43(5) 4484-4487   Jan 1991   [Refereed]
We present the observation of an optical Stark effect on multiple exciton states localized at a stacking fault in layered crystal BiI3. The level anticrossings concerning the crystal ground state as well as the multiple exciton states are clearly ...
I. Akai, T. Karasawa, T. Komatsu
268-269   Dec 1990   [Refereed]
Summary form only given. The time-resolved optical Stark effect (OSE) with high spectral resolution is presented for a characteristic exciton system. In the layered crystal BiI 3 , several sharp absorption lines appear near the absorption edge. Th...
I. Akai, T. Karasawa, Y. Kaifu, A. Nakamura, M. Shimura, M. Hirai
Journal of Luminescence   42(6) 357-363   Jan 1989   [Refereed]
The luminescence decay processes of the three ground-state excitons localized at a stacking fault with quasi two-dimensional symmetry in layered BiI 3 crystals were investigated in the picosecond time domain. The characteristic time behaviour of t...
Taketoshi Kawai, Ichiro Akai, Tsutomu Karasawa
journal of the physical society of japan   58(3) 969-977   1989   [Refereed]
The study of exciton transfer along the stacking fault interface in BiI 3 crystals is presented by using a newly designed space-resolved spectroscopy method. The resonant luminescence lines of the excitons with exact zero Stokes shift were observ...
Ichiro Akai, Tsutomu Karasawa, Yozo Kaifu
journal of the physical society of japan   58(2) 718-725   1989   [Refereed]
We have studied photocalorimetric spectra (PCS) of characteristic exciton transitions in Bil 3 crystals. Our PCS measuring system has the sensitivity of less than 10 -12 J - for the detection of photo-thermal heating after photo-excitation. The...
T. Karasawa, T. Kawai, I. Akai, Y. Kaifu
Journal of Luminescence   40/41 431-432   Jan 1988   [Refereed]
The direct observation of propagation of the excitons confined at the stacking fault interface in layered BiI 3 is presented by using a newly designed space-resolved spectroscopy. Extraordinary large diffusion constants of more than 10 5 cm 2 /sec...
I. Iakai, T. Karasawa, T. Komatsu, Y. Kaifu
physica status solidi (b)   150(2) 635-639   Jan 1988   [Refereed]
The optical Stark effect of an exciton system localized at a stacking fault (stacking fault excitons, SFE) in BiI 3 crystals is presented. The SFE states show three very sharp absorption lines called R, S, and T. The excitation laser frequency de...

Misc

 
小堀真美, 岩満一功, 山城耕平, 島本知茂, 赤井一郎
熊大極低温   (21) 43-46   Mar 2011
稲生繁, 長友悠介, 岩満一功, 赤井一郎
熊大極低温   (21) 35-38   Mar 2011
藤井拓也, 海江田真祐, 岩満一功, 鳥原慎吾, 赤井一郎
熊大極低温   (21) 39-42   Mar 2011
Kobori Mami, Iwamitsu Kazunori, Yamashiro Kouhei, Shimamoto Tomoshige, Akai Ichiro
熊本大学極低温装置室ユーザー研究報告書 : 熊大極低温   21 43-46   Mar 2011
We have investigated coherent phonons in trans-stilbene, which is one of the light-harvesting (LH) antenna component molecules of LH-dendrimers. In the LH-dendrimers, low frequency vibrational modes in the LH-antenna subunits play an important rol...
Fujii Takuya, kaieda Shinsuke, Iwamitsu Kazunori, Torihara Shingo, Akai Ichiro
熊本大学極低温装置室ユーザー研究報告書 : 熊大極低温   21 39-42   Mar 2011
To obtain further understanding of the energy transfer in light harvesting (LH) dendrimer, we studied optical spectra of LH antenna component molecules and examined the electronic structure of these molcules. In 1,3,5-triphenylbenzene and 1,3-diph...
Inao Shigeru, Nagatomo Yuusuke, Iwamitsu Kazunori, Akai Ichiro
熊本大学極低温装置室ユーザー研究報告書 : 熊大極低温   21 35-37   Mar 2011
We studied μPL spectra in a Lz-gradient quantum well structure. In the Lz-gradient QW, the thickness of the QW changes monotonously along the Y-axis of the sample, and the peak shifts of excitonic luminescence are observed depending on Lz. In addi...
Miyanari Kuniaki, Shimamoto Tomoshige, Fujii Atsuhiro, Akai Ichiro, Kimura Mutsumi
Cryogenics report of Kumamoto University   20 75-78   Mar 2010
At room temperature, a rapid energy transfer (ET) occurs efficiently under the selective excitation of light-harvesting (LH) antennas in phenylene-based dendrimers (PhDGn;n=1,2). However, the ET quantum efficiency degrades obviously at temperature...
Shimamoto Tomoshige, Miyanari Kuniaki, Fujii Atsuhiro, Akai Ichiro, Kimura Mutsumi
Cryogenics report of Kumamoto University   20 71-74   Mar 2010
From analyses of molecular vibrations, we have studied rapid energy transfer (ET) process in a series of star-shaped stilbenoid phthalocyanine (SSSnPc;n=1,2) dendrimers having π-conjugated light harvesting (LH) antennas. In SSSnPc, the aromatic ri...
Akai Ichiro, Miyanari Kuniaki, Shimamoto Tomoshige, Fujii Atsuhiro, Nakao H., Okada Akira, Kanemoto Katsuichi, Karasawa Tsutomu, Ishida A., Yamada Ai, Katayama I.., Takeda Jun, Kimura Mutsumi
Cryogenics report of Kumamoto University   19 61-64   Mar 2009
赤井 一郎, 宮成 邦明, 島本 知茂
Cryogenics report of Kumamoto University   (20) 61-70   2009
Akai Ichiro, Higuchi Masayuki, Kanemoto Katsuichi, Karasawa Tsutomu, Hashimoto Hideki, Kimura Mutsumi
Cryogenics report of Kumamoto University   18 89-92   Mar 2008
Micro-spectroscopy of CdTe/ZnTe quantum structures (jointly worked)
S.Usui, I.Akai, K.Watanabe, K. Kanemoto, T.Karasawa
Proceedings of the 18th Symposium of Association for Condensed Matter Photophysics, Japan (2007)   95-98   2007
Time-Frequency Two-Dimensional Imaging of Rapid Energy Transfer in Star-Shaped Light-Harvesting Dendrimers (jointly worked)
A. Ishida, A. Yamada, A. Okada, I. Akai, K. Kanemoto, T. Karasawa, M. Kimura , J. Takeda
Proceedings of the 18th Symposium of Association for Condensed Matter Photophysics, Japan (2007)   63-66   2007
Energy transfer dynamics and shielding effects in wire-type dendrimers having oligophenylene LH-antennas (jointly worked)
I. Akai, M. Higuchi, K. Kanemoto, T. Karasawa, H. Hashimoto, M. Kimura
Proceedings of the 18th Symposium of Association for Condensed Matter Photophysics, Japan (2007)   175-178   2007
Exciton dissociation and photo conductivity induced by the application of an electric field in pi-conjugated polymer MEH-PPV (jointly worked)
T.Shimoda, K.Kanemoto, I.Akai, T.Karasawa
Proceedings of the 18th Symposium of Association for Condensed Matter Photophysics, Japan (2007)   179-182   2007
Electroabsorption Spectroscopy on a Layered pi-Conjugated Polymer Polythiophene Derivative and its dependence on the direction of the applied field (jointly worked)
T. Higuchi, K. Kanemoto, I. Akai, T. Karasawa
Proceedings of the 18th Symposium of Association for Condensed Matter Photophysics, Japan (2007)   31-34   2007
Rapid energy transfer and its temperature dependence (jointly worked)
I. Akai, K. Miyanari, T. Shimamoto, A. Fujii, H. Nakao, A. Okada, K. Kanemoto, T. Karasawa, A. Ishida, A. Yamada, I. Katayama, J. Takeda, M. Kimura
Procceedings of the 19th Symposium of Association for Condensed Matter Photophysics, Japan (2008)   66-69   2008
Energy transfer dynamics in small dendrimers with different light-harvesting antennas studied by time-frequency two-dimensional imaging spectroscopy (jointly worked)
A. Yamada, N, Nagayoshi, I. Akai, M. Kimura. I. Katayama, J. Takeda
Proceedings of the 19th Symposium of Association for Condensed Matter Photophysics, Japan (2008)   70-73   2008
Length dependence of rapid energy transfer in pi-conjugated dendrimers having oligo phenylenevinylene antennas
T. Shimamoto, K. Miyanari, A. Fujii, I. Akai, M. Kimura
Physics Reports of Kumamoto University   13 341-348   2010
Unidirectional Exciton Diffusion in Lz-gradient Quantum Well
I. Akai, S. Inao, Y. Nagatomo, K. Iwamitsu, T.Shimamoto, A. Fujii
Physics Procedia   29 1   2012
Diffusion of high density excitons in Lz-gradient quantum well
I. Akai, S. Konishi, T. Kitano, T. Kawamoto, K. Iwamitsu, T. Shimamoto and A. Fujii
Proceedings of 21st Int. Symp. "Nanostructures: Physics and Technology"   126-127   2013
Coherent phonons in a 1, 3, 5-tri-phenylbenzene crystal
T. Kawamoto, Y. Yoshizaki, K. Yamashiro, K. Iwamitsu, T. Shimamoto, and I. Akai
JPS Conf. Proc.   1 012071   2014
Stress-induced effects in yellow and green excitons of Cu2O thin films sandwiched by MgO plates
K. Iwamitsu, S. Aihara, A. Ota, Y. Yoshizaki, T. Shimamoto, and I. Akai
1 012079   2014
Thickness dependence of excitonic spectra in Cu2O thin films sandwiched by MgO plates
S. Aihara, A. Ota, K. Iwamitsu, T. Shimamoto, and I Akai
JPS Conf. Proc.   1 012077   2014

Books etc

 
Photosynthesis: Theory and Applications in Energy, Biotechnology and Nanotechnology
Nova Science Publisher   2009   ISBN:9781606927199

Conference Activities & Talks

 
Bayesian Spectroscopy with a Replica Exchange Monte Carlo Method for Study of a Biaxial Stress Effect on Excitons in a Cu22O Thin Crystal
K. Iwamitsu, M. Okada, I. Akai
The 12th International Conference on Excitonic and Photonic Processes in Condensed Matter and Nano Materials (EXCON 2018)   13 Jul 2018   
有嶋駿士郎, 岩満一功, 高橋和敏, 岡田真人, 岡田真人, 赤井一郎
日本物理学会講演概要集(CD-ROM)   23 Mar 2018   
山代哲也, 有嶋駿士郎, 切通愛莉紗, 岩満一功, 赤井一郎
日本物理学会講演概要集(CD-ROM)   23 Mar 2018   
水牧仁一朗, 切通愛莉紗, 有嶋駿士郎, 岩満一功, 岡田真人, 岡田真人, 赤井一郎
日本物理学会講演概要集(CD-ROM)   23 Mar 2018   
岩満一功, 中山正昭, 岡田真人, 岡田真人, 赤井一郎
日本物理学会講演概要集(CD-ROM)   23 Mar 2018   
赤井一郎, 岩満一功, 岡田真人, 岡田真人
日本物理学会講演概要集(CD-ROM)   23 Mar 2018   
Bayesian Spectroscopy for Spectral and Normal Mode Analyses in Solid-State Materials [Invited]
K. Iwamitsu, M. Okada, and I. Akai
International Symposium on Kumamoto Synchrotron Radiation (ISKSR5)   1 Nov 2017   
Bayesian spectroscopy of excitonic photoluminescence spectra in Cu2O thin crystals
A. Kiridoshi, S. Arishima, M. Mizumaki, K. Iwamitsu, I. Akai
International Symposium on Kumamoto Synchrotron Radiation (ISKSR5)   1 Nov 2017   
Bayesian spectroscopy of x-ray photoelectron spectra in graphenes having atomic thicknesses on SiC substrates
S. Arishima, K. Iwamitsu, K. Takahashi, M. Okada, I. Akai
International Symposium on Kumamoto Synchrotron Radiation (ISKSR5)   1 Nov 2017   
岩満一功, 切通愛莉紗, 馬込栄輔, 赤井一郎
日本物理学会講演概要集(CD-ROM)   25 Sep 2017   
有嶋駿士郎, 岩満一功, 高橋和敏, 岡田真人, 赤井一郎
日本物理学会講演概要集(CD-ROM)   25 Sep 2017   
切通愛莉紗, 岩満一功, 赤井一郎
日本物理学会講演概要集(CD-ROM)   25 Sep 2017   
切通愛莉紗, 岩満一功, 赤井一郎
日本物理学会講演概要集(CD-ROM)   25 Sep 2017   
赤井一郎, 赤井一郎, 岩満一功, 五十嵐康彦, 五十嵐康彦, 岡田真人, 岡田真人, 岡島敏浩, 平井康晴
日本物理学会講演概要集(CD-ROM)   25 Sep 2017   
有嶋駿士郎, 岩満一功, 市川聡夫, 島本知茂, 赤井一郎
日本物理学会講演概要集(CD-ROM)   25 Sep 2017   
Bayesian spectroscopy in solid-state photo-physics [Invited]
Ichiro Akai, Kazunori Iwamitsu, Masato Okada
International Meeting on "High-Dimensional Data-Driven Science" (HD3-2017)   13 Sep 2017   
Bayesian spectroscopy for spectral and normal mode analyses in solid-state materials
Kazunori Iwamitsu, Masato Okada, Ichiro Akai
International Meeting on "High-Dimensional Data-Driven Science" (HD3-2017)   12 Sep 2017   
Bayesian spectroscopy of x-ray photoelectron spectra in graphenes having atomic thicknesses on SiC substrates
S. Arishima, K. Iwamitsu, K. Takahashi, M. Okada, I. Akai
International Meeting on "High-Dimensional Data-Driven Science" (HD3-2017)   12 Sep 2017   
Bayesian spectroscopy of excitonic photoluminescence spectra in Cu2O thin crystals
A. Kiridoshi, S. Arishima, M. Mizumaki, K. Iwamitsu, and I. Akai
International Meeting on "High-Dimensional Data-Driven Science" (HD3-2017)   12 Sep 2017   
Sparse modeling of extended x-ray absorption fine structures [Invited]
Ichiro Akai
ISKSR4: 4th International Symposium on Kumamoto Synchrotron Radiation: Cooperation of Experiments and Computer Sciences   15 May 2017   
岩満一功, 古川喜彬, 中山正昭, 徳田悟, 岡田真人, 赤井一郎
日本物理学会講演概要集(CD-ROM)   21 Mar 2017   
切通愛莉紗, 堤優太, 郡司昂弥, 相原慎吾, 岩満一功, 徳田悟, 岡田真人, 赤井一郎
日本物理学会講演概要集(CD-ROM)   21 Mar 2017   
有嶋駿士郎, 岩満一功, 相原慎吾, 高橋和敏, 徳田悟, 岡田真人, 赤井一郎
日本物理学会講演概要集(CD-ROM)   21 Mar 2017   
平岡知威, 奥村洋平, 切通愛莉紗, 郡司昂弥, 相原慎吾, 岩満一功, 藤井宗明, 赤井一郎
日本物理学会講演概要集(CD-ROM)   21 Mar 2017   
赤井一郎, 赤井一郎, 岡島敏浩, 平井康晴, 岡田真人
日本物理学会講演概要集(CD-ROM)   21 Mar 2017   
Data Driven Science by Sparse Modeling on Materials Informatics [Invited]
I. Akai
ISKSR3: 3rd International Symposium on Kumamoto Synchrotron Radiation: Data Analysis and Data-Driven Science   30 Nov 2016   
Bayesian analysis of X-ray photoelectron spectra in monolayer and multilayer graphenes grown on SiC(0001)
K. Iwamitsu, S. Arishima, K. Takahashi, S. Tokuda, M. Okada, and I. Akai
ISKSR3: 3rd International Symposium on Kumamoto Synchrotron Radiation: Data Analysis and Data-Driven Science   30 Nov 2016   
Mode Decomposition of Coherent Phonon Signals by SpDMD
S. Aihara, S. Murata, S. Tokuda, K. Mizoguchi, M. Okada, I. Akai
ISKSR3: 3rd International Symposium on Kumamoto Synchrotron Radiation: Data Analysis and Data-Driven Science   30 Nov 2016   
Substrate Temperature Dependence of BiI3 Thin Films on Al2O3 Substrate Grown by a Hot-Wall Technique
R. Sakamoto, K. Iwamitsu, S. Aihara, F. Ichikawa, T. Shimamoto, I. Akai
ISKSR3: 3rd International Symposium on Kumamoto Synchrotron Radiation: Data Analysis and Data-Driven Science   30 Nov 2016   
Photoluminescence spectra in Cu2O thin crystals recrystallized epitaxially between paired MgO plates and their polarization dependences
K. Gunji, S. Aihara, A.Kiridoshi, Y. Tsutsumi, K. Iwamitsu, F. Ichikawa, I. Akai
ISKSR3: 3rd International Symposium on Kumamoto Synchrotron Radiation: Data Analysis and Data-Driven Science   30 Nov 2016   
Spectral decomposition of excitonic photoluminescence spectra in Cu2O thin crystals by Bayesian inference
A. Kiridoshi, Y. Tsutsumi, K. Gunji, S. Aihara, K. Iwamitsu, S. Tokuda, M. Okada, I. Akai
ISKSR3: 3rd International Symposium on Kumamoto Synchrotron Radiation: Data Analysis and Data-Driven Science   30 Nov 2016   
Spectral decomposition of X-ray photoelectron spectrum in graphenes having atomic thicknesses with a replica exchange Monte Carlo method
S. Arishima, K. Iwamitsu, S. Aihara, K. Takahashi, S. Tokuda, M. Okada and I. Akai
ISKSR3: 3rd International Symposium on Kumamoto Synchrotron Radiation: Data Analysis and Data-Driven Science   30 Nov 2016   
Akai I., Hamamoto M., Aihara S., Iwamitsu K., Okada M.
Meeting Abstracts of the Physical Society of Japan   2016   
Iwamitsu K., Aihara S., Okada M., Akai I.
Meeting Abstracts of the Physical Society of Japan   2016   
Sakamoto R., Iwamitsu K., Aihara S., Ichikawa F., Shimamoto T., Akai I.
Meeting Abstracts of the Physical Society of Japan   2016   
<p>我々はHot-Wall法を用いてBiI_3_薄膜においてファン・デル・ワールス・エピタキシによる積層欠陥の人工制御の実現とそれに束縛された積層欠陥励起子状態の光物性の解明を目指している。今回の発表ではAl_2_O_3_基板上に成膜した試料のX線回折と吸収スペクトルから試料の成膜速度依存性について報告する。</p>
Aihara S., Murata S., Tokuda S., Iwamitsu K., Mizoguchi K., Okada M., Akai I.
Meeting Abstracts of the Physical Society of Japan   2016   
<p>コヒーレントフォノン(CP)振動信号の解析の問題点として、観測データ上でキャリア減衰や原因不明の揺らぎなどの信号が目的の振動信号とともに観測されることが上げられる。講演では、SpDMDを用いてCP信号を解析し、不要な振動・減衰信号を目的のCP振動信号から分離、従来のFFTやウェーブレット解析に対しての優位性を発表する。</p>
Akai I., Murata S., Aihara S., Tokuda S., Iwamitsu K., Okada M.
Meeting Abstracts of the Physical Society of Japan   2016   
<p>Sparsity-promoting dynamic mode decomposition (SpDMD)は非線形流体の音波のモード分解に用いられる。本発表では、SpDMDをフェムト秒時間領域のコヒーレントフォノン信号のモード分解に用いる方法について発表する。</p>
切通愛莉紗, 堤優太, 郡司昂弥, 相原慎吾, 岩満一功, 徳田悟, 岡田真人, 岡田真人, 赤井一郎
光物性研究会論文集   2016   
有嶋駿士郎, 岩満一功, 相原慎吾, 高橋和敏, 徳田悟, 岡田真人, 岡田真人, 赤井一郎
光物性研究会論文集   2016   
郡司昂弥, 相原慎吾, 切通愛莉紗, 堤優太, 岩満一功, 市川聡夫, 赤井一郎
光物性研究会論文集   2016   
坂本隆太, 有嶋駿士郎, 岩満一功, 相原慎吾, 市川聡夫, 島本知茂, 赤井一郎
光物性研究会論文集   2016   
相原慎吾, 村田伸, 徳田悟, 溝口幸司, 岡田真人, 岡田真人, 赤井一郎
光物性研究会論文集   2016   
岩満一功, 古川喜彬, 中山正昭, 徳田悟, 岡田真人, 岡田真人, 赤井一郎
光物性研究会論文集   2016   
赤井一郎, 赤井一郎, 岡島敏浩, 平井康晴, 岡田真人, 岡田真人
光物性研究会論文集   2016   
Bayesian estimation of excitonic absorption spectra with the Metropolis algorithm
K. Iwamitsu, S. Aihara, M. Okada and I. Akai
International Meeting on "High-Dimensional Data Driven Science" (HD3-2015)   14 Dec 2015   
Long continuing coherent phonon in a bismuth thin-film
M. Hamamoto, K. Iwamitsu, I. Akai
International Symposium on Advanced Materials Having Multi-Degrees-of-Freedom -- Optical properties, Structural Analyses, Imaging and Informatics of Materials -- (ISAMMDoF2015)   2 Nov 2015   
Optimal Growth Condition of Layered Semiconductor BiI3 Grown by Hot-Wall Method
R. Sakamoto, K. Iwamitsu, S. Aihara, F. Ichikawa, T. Shimamoto, I. Akai
International Symposium on Advanced Materials Having Multi-Degrees-of-Freedom -- Optical properties, Structural Analyses, Imaging and Informatics of Materials -- (ISAMMDoF2015)   2 Nov 2015   
Photoluminescence spectra in Cu2O thin crystals and thier polarization dependences
K. Gunji, S. Aihara, F. Ichikawa, I. Akai
International Symposium on Advanced Materials Having Multi-Degrees-of-Freedom -- Optical properties, Structural Analyses, Imaging and Informatics of Materials -- (ISAMMDoF2015)   2 Nov 2015   
Bayesian deconvolution of photoluminescence spectra of yellow 1S excitons in Cu2O thin films sandwiched by MgO plates
S. Aihara, K. Gunji, K. Iwamitsu, M. Okada, I. Akai
International Symposium on Advanced Materials Having Multi-Degrees-of-Freedom -- Optical properties, Structural Analyses, Imaging and Informatics of Materials -- (ISAMMDoF2015)   2 Nov 2015   
Bayesian Estimation of Excitonic Absorption Spectra
K. Iwamitsu, S. Aihara, M. Okada, I. Akai
International Symposium on Advanced Materials Having Multi-Degrees-of-Freedom -- Optical properties, Structural Analyses, Imaging and Informatics of Materials -- (ISAMMDoF2015)   2 Nov 2015   
Excitonic Transitions in Thin Films of Layered Semiconductor BiI3 Grown by a Hot-Wall Technique
R. Sakamoto, T. Ueda, K. Iwamitsu, F. Ichikawa, K. Watanabe, T. Shimamoto, and I. Akai
17th International Conference on Modulated Semiconductor Structures (Joint Conference EP2DS-21/MSS-17)   26 Jul 2015   
Trapping potential formation for the yellow 1S excitons in Cu2O thin films sandwiched by MgO plates
S. Aihara K. Gunji, A. Ota, K. Iwamitsu, F. Ichikawa, H. Isobe, T. Shimamoto, I. Akai
17th International Conference on Modulated Semiconductor Structures (Joint Conference EP2DS-21/MSS-17)   26 Jul 2015   
Sakamoto R., Iwamitsu K., Aihara S., Ichikawa F., Shimamoto T., Akai I.
Meeting Abstracts of the Physical Society of Japan   2015   
Aihara S., Gunji K., Iwamitsu K., Ichikawa F., Isobe H., Shimamoto T., Akai I.
Meeting Abstracts of the Physical Society of Japan   2015   
Iwamitsu K., Aihara S., Okada M., Akai I.
Meeting Abstracts of the Physical Society of Japan   2015   
Iwamitsu K., Aihara S., Shimamoto T., Akai I.
Meeting Abstracts of the Physical Society of Japan   2015   
Sakamoto R., Ueda T., Iwamitsu K., Ichikawa F., Shimamoto T., Akai I.
Meeting Abstracts of the Physical Society of Japan   2015   
濱本真由美, 相原信吾, 岩満一功, 岡田真人, 岡田真人, 赤井一郎
光物性研究会論文集   2015   
坂本隆太, 岩満一功, 相原慎吾, 市川聡夫, 島本知茂, 赤井一郎
光物性研究会論文集   2015   
郡司昂弥, 相原慎吾, 市川聡夫, 赤井一郎
光物性研究会論文集   2015   
岩満一功, 相原慎吾, 岡田真人, 岡田真人, 赤井一郎
光物性研究会論文集   2015   
相原慎吾, 郡司昂弥, 濱本真由美, 岩満一功, 岡田真人, 岡田真人, 赤井一郎
光物性研究会論文集   2015   
Aihara S., Ota A., Iwamitsu K., Ichikawa F., Shimamoto T., Akai I.
Meeting abstracts of the Physical Society of Japan   22 Aug 2014   
Iwamitsu K., Shimamoto T., Akai I., Serov A. Yu, Filosofov N. G., Karzewski G., Agekyan V. F.
Meeting abstracts of the Physical Society of Japan   22 Aug 2014   
Aihara S., Ota A., Iwamitsu K., Ichikawa F., Shimamoto T., Akai I.
Meeting abstracts of the Physical Society of Japan   5 Mar 2014   
Iwamitsu K., Aihara S., Ota A., Yoshizaki Y., Nakamura Y., Shimamoto T., Akai I.
Meeting abstracts of the Physical Society of Japan   5 Mar 2014   
29pPSA-47 X-ray diffraction and exciton spectra of BiI_3 thin films grown by a hot wall technique
Ueda T., Aihara S., Iwamitsu K., Ichikawa F., Shimamoto T., Akai I.
Meeting abstracts of the Physical Society of Japan   5 Mar 2014   
Diffusion of high density excitons in Lz-gradient quantum well [Invited]
AKAI Ichiro
The Fifth Meeting of Research Consortium on High-pressure Research and The Kumamoto International Symposium on Recent Advancements of Physics and Mineralogy VI   20 Jan 2014   
10aPS-103 Excitonic photoluminescence spectra in Cu_2O thin film sandwiched by MgO plates (II)
Aihara S., Ota A., Iwamitsu K., Ichikawa F., Shimamoto T., Akai I.
Meeting Abstracts of the Physical Society of Japan   2014   
27aCD-3 Excitonic photoluminescence spectra in Cu_2O thin film sandwiched by MgO plates
Aihara S., Ota A., Iwamitsu K., Ichikawa F., Shimamoto T., Akai I.
Meeting Abstracts of the Physical Society of Japan   2014   
8aAJ-12 Photoluminescence spectra and their thermal variations of CdTe multi-quantum wells sandwiched by a few MnTe mono-layers
Iwamitsu K., Shimamoto T., Akai I., Serov A. Yu, Filosofov N. G., Karzewski G., Agekyan V. F.
Meeting Abstracts of the Physical Society of Japan   2014   
29pPSA-45 The stress effect of wavelength modulated absorption spectra in Cu_2O thin films sandwiched by MgO plates III
Iwamitsu K., Aihara S., Ota A., Yoshizaki Y., Nakamura Y., Shimamoto T., Akai I.
Meeting Abstracts of the Physical Society of Japan   2014   
29pPSA-47 X-ray diffraction and exciton spectra of BiI_3 thin films grown by a hot wall technique
Ueda T., Aihara S., Iwamitsu K., Ichikawa F., Shimamoto T., Akai I.
Meeting Abstracts of the Physical Society of Japan   2014   
Coherent phonons in 1, 3, 5 tri-phenylbenzene single crystals II
Yoshizaki Y., Kawamoto T., Nakamura Y., Iwamitsu K., Shimamoto T., Akai I.
Meeting abstracts of the Physical Society of Japan   26 Aug 2013   
High density excitation effects and their spatial behaviors of excitons in a L_z-gradient QW
Kawamoto T., Konishi S., Yoshizaki Y., Iwamitsu K., Shimamoto T., Akai I.
Meeting abstracts of the Physical Society of Japan   26 Aug 2013   
The stress effect of wavelength modulated absorption spectra in Cu_2O thin films sandwiched by MgO plates II
Iwamitsu K., Aihara S., Ota A., Yoshizaki Y., Nakamura Y., Shimamoto T., Iida T., Akai I.
Meeting abstracts of the Physical Society of Japan   26 Aug 2013   
吉崎雄亮, 河本泰佑, 中村洋平, 岩満一功, 島本知茂, 赤井一郎
日本物理学会講演概要集   26 Aug 2013   
河本泰佑, 小西俊矢, 吉崎雄亮, 岩満一功, 島本知茂, 赤井一郎
日本物理学会講演概要集   26 Aug 2013   
28pPSA-32 Optical spectra of light-harvesting antenna component molecules with Meta branching structure
Nakamura Y., Torihara S., Iwamitsu K., Fujii A., Akai I.
Meeting abstracts of the Physical Society of Japan   26 Mar 2013   
28pEH-11 The stress effect of wavelength modulated absorption spectra in Cu_2O thin films sandwiched by MgO plates
Iwamitsu K., Aihara S., Yoshizaki Y., Shimamoto T., Fujii A., Akai I.
Meeting abstracts of the Physical Society of Japan   26 Mar 2013   
28pPSB-26 Sample dependence of wavelength modulated absorption spectra in Cu_2O thin films sandwiched by MgO plates
Aihara S., Ota A., Iwamitsu K., Shimamoto T., Fujii A., Akai I.
Meeting abstracts of the Physical Society of Japan   26 Mar 2013   
28pPSB-34 Coherent phonons in 1,3,5-Tri-phenylbenzene single erystals
Yoshizaki Y., Kawamoto T., Yamashiro K., Iwamitsu K., Shimamoto T., Fujii A., Akai I.
Meeting abstracts of the Physical Society of Japan   26 Mar 2013   
吉崎雄亮, 河本泰佑, 山城耕平, 岩満一功, 島本知茂, 藤井淳浩, 赤井一郎
日本物理学会講演概要集   5 Mar 2013   
岩満一功, 相原慎吾, 吉崎雄亮, 島本知茂, 藤井淳浩, 赤井一郎
日本物理学会講演概要集   5 Mar 2013   
相原慎吾, 太田暁庸, 岩満一功, 島本知茂, 藤井淳浩, 赤井一郎
日本物理学会講演概要集   5 Mar 2013   
中村洋平, 鳥原慎吾, 岩満一功, 藤井淳浩, 赤井一郎
日本物理学会講演概要集   5 Mar 2013   
The stress effect of wavelength modulated absorption spectra in Cu_2O thin films sandwiched by MgO plates II
Iwamitsu K., Aihara S., Ota A., Yoshizaki Y., Nakamura Y., Shimamoto T., Iida T., Akai I.
Meeting Abstracts of the Physical Society of Japan   2013   
High density excitation effects and their spatial behaviors of excitons in a L_z-gradient QW
Kawamoto T., Konishi S., Yoshizaki Y., Iwamitsu K., Shimamoto T., Akai I.
Meeting Abstracts of the Physical Society of Japan   2013   
Coherent phonons in 1, 3, 5 tri-phenylbenzene single crystals II
Yoshizaki Y., Kawamoto T., Nakamura Y., Iwamitsu K., Shimamoto T., Akai I.
Meeting Abstracts of the Physical Society of Japan   2013   
28pPSB-34 Coherent phonons in 1,3,5-Tri-phenylbenzene single erystals
Yoshizaki Y., Kawamoto T., Yamashiro K., Iwamitsu K., Shimamoto T., Fujii A., Akai I.
Meeting Abstracts of the Physical Society of Japan   2013   
28pPSB-26 Sample dependence of wavelength modulated absorption spectra in Cu_2O thin films sandwiched by MgO plates
Aihara S., Ota A., Iwamitsu K., Shimamoto T., Fujii A., Akai I.
Meeting Abstracts of the Physical Society of Japan   2013   
28pPSA-32 Optical spectra of light-harvesting antenna component molecules with Meta branching structure
Nakamura Y., Torihara S., Iwamitsu K., Fujii A., Akai I.
Meeting Abstracts of the Physical Society of Japan   2013   
28pEH-11 The stress effect of wavelength modulated absorption spectra in Cu_2O thin films sandwiched by MgO plates
Iwamitsu K., Aihara S., Yoshizaki Y., Shimamoto T., Fujii A., Akai I.
Meeting Abstracts of the Physical Society of Japan   2013   
岩満一功, 相原慎吾, 太田暁庸, 吉崎雄亮, 島本知茂, 赤井一郎
光物性研究会論文集   2013   
吉崎雄亮, 河本泰佑, 相原慎吾, 中村洋平, 岩満一功, 島本知茂, 赤井一郎
光物性研究会論文集   2013   
上田智博, 相原慎吾, 岩満一功, 市川聡夫, 島本知茂, 赤井一郎
光物性研究会論文集   2013   
小西俊矢, 河本泰佑, 吉崎雄亮, 岩満一功, 島本知茂, 赤井一郎
光物性研究会論文集   2013   
畑田尚輝, 一期崎翔, 畑田享佑, 吉崎雄亮, 岩満一功, 島本知茂, 赤井一郎
光物性研究会論文集   2013   
相原慎吾, 太田暁庸, 吉崎雄亮, 岩満一功, 市川聡夫, 島本知茂, 赤井一郎
光物性研究会論文集   2013   
18aPSB-9 The temperature dependence of wavelength modulated absorption spectra in Cu_2O thin films sandwiched by MgO plates II
Iwamitsu K., Aihara S., Shimamoto T., Fujii A., Akai I.
Meeting abstracts of the Physical Society of Japan   24 Aug 2012   

Works

 
Energy transfer processes in light-harvesting dendrimers at low temperature
2007
Ultrafast energy transfer dynamics in light-harvesting dendrimers
2007
Optical properties of pi-conjugated conducting polymers
2007
Migration dynamics of excitons in nano sized quantum structures of semiconductors
2007

Research Grants & Projects

 
High dendsity excitons in Cu2O
The Other Research Programs
Project Year: 2010   
Coherent phonons in soft-materials
The Other Research Programs
Project Year: 2010