Arao Nakamura

Tohoku University

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Yutaka Moritomo

University of Tsukuba

Masao Ichida

Konan University

T. Tokizaki

National Institute of Advanced Industrial Science and Technology

Akihiko Machida

Kansai Photon Science Institute

Hideo Kishida

Nagoya University

Yasushi Hamanaka

Nagoya Institute of Technology

Kenji Ohoyama

Ibaraki University

Takeshi Koyama

Nagoya University

I. Yamakawa

Nagoya University

Masaki Takata

Tohoku University

Cooperative Institutions

Nagoya University

191

The University of Tokyo

115

Japan Science and Technology Agency

Tohoku University

Osaka University

National Institute of Advanced Industrial Science and Technology

Kyoto University

Tokyo Institute of Technology

Tokyo University of Science

Kyushu University

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Optical nonlinearities of a high concentration of small metal particles dispersed in glass: copper and silver particles

Journal of the Optical Society of America B (1994)

K. Uchida Shinji Kaneko S. Omi C. Hata Hiroaki Tanji

Third-order nonlinearities of glasses doped with a large number of copper or silver particles are studied by degenerate four-wave mixing with an emphasis on particle-size dependence. The nonlinear susceptibility χ(3) exhibits a peak at the wavelength of the absorption peak, with a maximum value of the order of 10−7 esu. The value of χ(3)/α is roughly independent of the absorption coefficient α and increases as the particle radius increases. This result is well explained by the size dependence of the imaginary part of the dielectric constant of metal particles and the local-field factor. The time response of the nonlinearity exhibits two-component behavior: the fast decay time is shorter than the pulse width of the laser (~12 ps), whereas the slow one is 120–200 ps, being weakly dependent on the radius.

10.1364/josab.11.001236

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Citations (374)

High-Pressure Structural Analysis of Fe₃O₄

Journal of the Physical Society of Japan (2002)

Akira Kuriki Yutaka Moritomo Yasuo Ohishi Kenichi Kato Eiji Nishibori

Dept. of Crystalline Materials Science, Nagoya University, Nagoya 464-8603 Dept. of Applied Physics, Nagoya University, Nagoya 464-8603 SPring-8/JASRI, 1-1-1 Koto, Mikazuki-cho, Sayo-gun, Hyogo 679-5198 Faculty of Science and Technology, Science University of Tokyo, Chiba 278-8510 ISSP, University of Tokyo, Kashiwa 277-8581 Dept. of Physics, Saitama University, Saitama 338-8570 SPring-8/JAERI, 1-1-1 Koto, Mikazuki-cho, Sayo-gun, Hyogo 679-5198

10.1143/jpsj.71.3092

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Citations (18)

Critical behavior of a photodisordered spin system in doped manganite

Physical review. B, Condensed matter (2001)

X. J. Liu Yutaka Moritomo Arao Nakamura Hidekazu Tanaka Tsuyoshi Kawai

Dynamics of the spin system has been investigated in a ferromagnetic ${\mathrm{La}}_{0.7}{\mathrm{Ca}}_{0.3}{\mathrm{MnO}}_{3}$ film by means of a time-resolved pump-probe method. In a weak excitation condition, the relaxation time $\ensuremath{\tau}$ increases critically on approaching the critical temperature ${T}_{\mathrm{C}}(=262$ K) from the low-temperature side as $\ensuremath{\tau}\ensuremath{\propto}|{T/T}_{\mathrm{C}}\ensuremath{-}1{|}^{\ensuremath{-}1.39}$ for $T\ensuremath{\gtrsim}200$ K. Surprisingly, the same scaling relation holds even after strong excitation in a much wider temperature range down to $\ensuremath{\sim}10$ K. We will discuss these behaviors in terms of photoinduced growth of the charge-ordering fluctuations.

Manganite

Atmospheric temperature range

10.1103/physrevb.64.100401

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Citations (36)

Perpendicular transport of photoexcited electrons and holes in GaAs/AlAs short-period superlattices: Barrier-thickness and temperature dependence

Physical review. B, Condensed matter (1989)

K. Fujiwara Noriaki Tsukada Tsuneyoshi Nakayama Arao Nakamura

Perpendicular transport of photoexcited carriers, which sink into an intentionally enlarged quantum well, is investigated in a set of GaAs/AlAs short-period superlattices with systematically varied AlAs barrier thicknesses as a function of the lattice temperature between 4.2 and 200 K. Excitation-power dependence of the luminescence observed at low temperatures indicates that the ambipolar transport is operative at carrier densities in excess of ${10}^{15}$--${10}^{17}$ ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}3}$. We find that tunneling-assisted hopping conduction prevails at low temperatures via localized states and that the tunneling probability is correlated with the calculated heavy-hole miniband width. We also find a crossover from the hopping conduction to the Bloch-type transport at higher temperatures, which critically depends on the barrier thickness, as a result of thermal activation of carriers to the extended miniband states.

Ambipolar diffusion

Rectangular potential barrier

10.1103/physrevb.40.1096

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Citations (38)

One-Center Small Polarons as Short-Lived Precursors in Self-Trapping Processes of Holes and Electron-Hole Pairs in Alkali Iodides

Physical Review Letters (1996)

S. Iwai T. Tokizaki Arao Nakamura Katsumi Tanimura Noriaki Itoh

Initial processes of self-trapping of holes and electron-hole pairs in KI and RbI crystals have been investigated by means of a femtosecond pump-probe spectroscopy. We have found that a new short-lived intermediate is formed as a precursor of the self-trapped hole in the form of the halogen molecular ion with a ${D}_{2h}$ symmetry. This state is identified to be a one-center type self-trapped hole on the basis of the quantum mechanical cluster calculations. A one-center self-trapped state is also created as a precursor for self-trapped excitons.

Femtochemistry

Center (category theory)

Electron hole

10.1103/physrevlett.76.1691

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Citations (35)

Luminescence properties of C70 in solutions and solids

Journal of Luminescence (1997)

Masao Ichida Masatoshi Sakai Takayoshi Yajima Arao Nakamura

Crystal (programming language)

10.1016/s0022-2313(97)00257-3

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Citations (3)

Preparation and Nonlinear Optical Properties of Ag/SiO₂ Glass Composite Thin Films

Japanese Journal of Applied Physics (1994)

Ichiro Tanahashi Masaru Yoshida Yoshio Manabe Takao Tohda Satoshi Sasaki

A multitarget sputtering method was applied to prepare Ag particles embedded in SiO 2 glass thin films. In the optical absorption spectra of the films, the absorption peak due to the surface plasmon resonance of Ag particles was clearly observed at the wavelength of 390–406 nm. The full width at half-maximum of the absorption band is decreased with increasing diameter of Ag particles. The third-order nonlinear susceptibility at 400 nm was estimated to be 1.6×10 -8 esu for the film with 9.0 at% of Ag by means of a degenerated four-wave mixing.

10.1143/jjap.33.l1410

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Citations (43)

Ultrafast Exciton Energy Transfer between Nanoscale Coaxial Cylinders: Intertube Transfer and Luminescence Quenching in Double-Walled Carbon Nanotubes

ACS Nano (2011)

Takeshi Koyama Yuki Asada Naoki Hikosaka Yasumitsu Miyata Hisanori Shinohara

We study exciton energy transfer in double-walled carbon nanotubes using femtosecond time-resolved luminescence measurements. From direct correspondence between decay of the innertube luminescence and the rise behavior in outertube luminescence, it is found that the time constant of exciton energy transfer from the inner to the outer semiconducting tubes is ∼150 fs. This ultrafast transfer indicates that the relative intensity of steady-state luminescence from the innertubes is ∼700 times weaker than that from single-walled carbon nanotubes.

10.1021/nn201661q

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Citations (28)

Composition fluctuations in InP/GaInAs/InP heterostructures –X-ray CTR scattering and cross-sectional STM measurements

IOP Conference Series Materials Science and Engineering (2011)

Yoshikazu Takeda M. Masuda Masao Tabuchi Arao Nakamura

Composition profiles in and around GaInAs layers of InP/GaInAs/InP heterostructures grown by MOVPE were measured by the X-ray CTR scattering and the cross-sectional STM (XSTM) techniques. In the XSTM images, brightness fluctuations in GaInAs are clearly observed. It is discussed in terms of composition fluctuations in GaInAs and a possibility of clustering of GaAs-rich and InAs-rich regions is indicated. The compositions of Ga and As are calculated from the XSTM images and compared with those obtained by the X-ray CTR scattering measurements. Similarity and difference of both profiles are discussed.

10.1088/1757-899x/24/1/012003

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Citations (0)

Third-order nonlinear optical properties of Au-particles/SiO/sub 2/ glass composite thin films prepared by sputtering method

Conference on Lasers and Electro-Optics Europe (2005)

Ichiro Tanahashi M. Yoshlda Yoshio Manabe Tsuneo Mitsuyu S. Sasakl

10.1109/cleoe.1994.636294

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Citations (0)