MORITA Ryuji

J-GLOBAL         Last updated: Jul 19, 2019 at 12:29
 
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Name
MORITA Ryuji
Affiliation
Hokkaido University
Section
Faculty of Engineering, Division of Applied Physics
Job title
Professor
Degree
Dr. of Engineering (Applied Physics), The University of Tokyo, 1990(The University of Tokyo)

Research Areas

 
 

Academic & Professional Experience

 
Apr 2017
 - 
Mar 2019
Inivted Professor, Laboratoire de Photonique Quantique et Moleculaire, Institut d'Alembert,, Ecole Normale Superieure Paris-Saclay,
 
2010
 - 
Today
Professor, Department of Applied Physics, Hokkaido University
 
2010
   
 
- Professor
 

Committee Memberships

 
Apr 2018
 - 
Today
Editorial board member of Photinics Research (Optical Society)
 
2017
 - 
Today
Scientific Reports (Nature publishing group)  Editorial Board Member
 
Apr 2014
 - 
Today
Applied Physics Express/ Japanese Journal of Applied Physics  Editor
 
Apr 2017
 - 
Mar 2019
Maison du Japon. Cite Internationale Universitaire de Paris, Université de Paris  Directeur
 
2017
 - 
2017
Optics Express (Optical Society)  Editor
 

Awards & Honors

 
Apr 2017
APEX/JJAP Editorial Contribution Award, The Japan Society of Applied Physics
 
Sep 2016
Award for Outstanding Peer Reviewer of Grants-in-Aid for Scientific Research (KAKENHI), JSPS
 
Sep 2016
"Control of Topology of Ultrashort Optical Pulses and Its Precise Characterization", 10th JSAP Fellow, The Japan Society of Applied Physics
 
Sep 2015
The 37th The Japan Society of Applied Physics Outstanding Paper Award, The Japan Society of Applied Physics
Winner: Kyohhei Shigematsu, Yasunori Toda, Keisaku Yamane, and Ryuji Morita
 
May 2012
Senior Member Designation, Optical Society (of America)
 

Published Papers

 
A New Twist for Materials Science: The Formation of Chiral Structures Using the Angular Momentum of Light
T. Omatsu, K. Miyamoto, K. Toyoda, R. Morita, Y. Arita, K. Dholakia
Advanced Optical Materials   7(14) 1801672/1-20   Jul 2019   [Refereed]
Comprehensive quantitative analysis of vector beam states based on vector field reconstruction
M, Suzuki, K, Yamane, K, Oka, Y. Toda, R. Morita,
Sci. Rep.   9 9979/1-14   Jul 2019   [Refereed]
Generation of arbitrary axisymmetrically polarized pulses by using the combination of 4-Tex spatial light modulator and common-path optical system
M. Suzuki, K. Yamane, M. Sakamoto, K. Oka, Y. Toda, R. Morita
Opt. Express   26 2584-2598   Feb 2018   [Refereed]
Y. Toda, A. Moriya, K. Yamane, R. Morita, K. Shigematsu, Y. Awaji
Appl. Phys. Lett.   111 101102/1-5   Sep 2017   [Refereed]
K. Shigematsu, M. Suzuki, K. Yamane, R. Morita, Y. Toda
Appl. Phys. Express   9 122401/1-4   Nov 2016   [Refereed]
K. Yamane, M. Sakamoto, N. Murakami, R. Morita, K. Oka
Opt. Lett   41 4597-4600   Oct 2016   [Refereed]
M. Suzuki, K. Yamane, K. Oka, Y. Toda, R. Morita
Phys. Rev. A   94 043851/1-7   Oct 2016   [Refereed]
Generation of optical vortices and their application
Ryuji Morita
OYO BUTURI   85(5) 396-403   May 2016   [Refereed][Invited]
F. Takahashi1, K. Miyamoto, H. Hidai, K. Yamane, R. Morita, T. Omatsu
Sci. Rep.   6 21738/1-10   2016   [Refereed]
K. Shigematsu, K. Yamane, R. Morita, Y. Toda
Phys. Rev. B   93 045205/1-8   2016   [Refereed]
F. Takahashi, S. Takizawa, H. Hidai, K. Miyamoto, R. Morita, T. Omatsu
Phys. Status Solidi A   213 1063-1068   2016   [Refereed]
M. Suzuki, K. Yamane, K. Oka, Y. Toda, R. Morita
Sci. Rep.   5 17797/1-9   Dec 2015   [Refereed]
M. Suzuki, K. Yamane, K. Oka, Y. Toda, R. Morita
Optical Review   22 179-183   2015   [Refereed]
M. Sakamoto, R. Fukumoto, N. Murakami, R. Morita, K. Oka
Optical Review   22 174-178   2015   [Refereed]
K. Yamane, A. Honda, Y. Toda, R. Morita
Ultrafast Phenomena XIX   809-812   2015   [Refereed]
M. Suzuki, K. Yamane, K. Oka, Y. Toda, R. Morita
Opt. Express   22 16903-16915   2014   [Refereed]
M. Sakamoto, K. Oka, R. Morita, N. Murakami
Opt. Lett.   38 3661-3664   2013   [Refereed]
Y. Toda, K. Shigematsu, K. Yamane, R. Morita
Opt. Commun.   308 147-151   2013   [Refereed]
K. Toyoda, F. Takahashi, S. Takizawa, Y. Tokizane, K. Miyamoto, R. Morita, T. Omatsu
Phys. Rev. Lett.   110 143603/1-5   2013   [Refereed]
K. Shigematsu, Y. Toda, K. Yamane, R. Morita
Jpn. J. Appl. Phys.   52 08JL08/1-5   2013   [Refereed]
Yamane K, Toda Y, Morita R
Optics express   20 18986-18993   Aug 2012   [Refereed]
Toyoda K, Miyamoto K, Aoki N, Morita R, Omatsu T
Nano letters   12(7) 3645-3649   Jul 2012   [Refereed]
Omatsu T, Chujo K, Miyamoto K, Okida M, Nakamura K, Aoki N, Morita R
Optics express   18 17967-17973   Aug 2010   [Refereed]
Hamazaki J, Morita R, Chujo K, Kobayashi Y, Tanda S, Omatsu T
Optics express   18 2144-2151   Feb 2010   [Refereed]
Tokizane Y, Shimatake K, Toda Y, Oka K, Tsubota M, Tanda S, Morita R
Optics express   17 24198-24207   Dec 2009   [Refereed]
Tokizane Y, Oka K, Morita R
Optics express   17 14517-14525   Aug 2009   [Refereed]
Hamazaki J, Kawamoto A, Morita R, Omatsu T
Optics express   16 10762-10768   Jul 2008   [Refereed]
Hamazaki J, Mineta Y, Oka K, Morita R
Optics express   14 8382-8392   Sep 2006   [Refereed]
ADACHI Muneyuki, YAMANE Keisaku, MORITA Ryuji, YAMASHITA Mikio
Japanese journal of applied physics. Pt. 2, Letters & express letters   44(46-49) L1423-L1425   Dec 2005
Deng Yuqiang, Wu Zubin, Chai Lu, Wang Ching-yue, Yamane Keisaku, Morita Ryoji, Yamashita Mikio, Zhang Zhigang
Optics Express   13(6) 2120-2126   Mar 2005
We introduce a novel method for retrieving the phase from a spectral shearing interferogram, based on wavelet-transform technique. We demonstrate with both theoretical and experimental data that this technique provides an alternative and reliable ...
Adachi M., Yamane K., Morita R., Yamashita M.: "Sub-5-fs pulse compression of laser output using photonic crystal fiber with short zero-dispersion wavelength", Jpn. J. Appl. Phys., 44: L1423-L1425 (2005)*
   2005
Nakamura, S., Takasawa, N., Koyamada, Y., Sone, H., Xu L., Morita, R., Yamashita, M.
Jpn. J. Appl. Phys.   44(10) 7453-7459   2005   [Refereed]
Nakamura, S., Takasawa, N., Koyamada, Y., Sone, H., Xu, L., Morita, R., Yamashita, M.: "Extended finite difference time domain analysis of induced phase modulation and four-wave mixing between two-color femtosecond laser pulses in a silica fiber w...
Adachi Muneyuki, Yamane Keisaku, Morita Ryuji, Yamashita Mikio
IEEE Photonics Technology Letters   16(8) 1951-1953   Aug 2004
Characterization and compensation of the complex spectral phase and the temporal profile of output pulses from a photonic crystal fiber (620-945-nm spectral broadening) were performed using a computer-controlled feedback system that combines a mod...
Yamashita Mikio, Hirasawa Masakatsu, Nakagawa Naoya, Yamamoto Kazuki, Oka Kazuhiko, Morita Ryuji, Suguro Akira
Journal of the Optical Society of America B : Optical Physics   21(2) 458-462   Feb 2004
The 530-880-nm continuum pulse with a greatly asymmetric temporal profile over 500 fs and a spectral phase variation over 150 rad, which was generated by induced phase modulation (IPM) as well as self-phase modulation in a conventional fused-silic...
Itoh, K., Toda, Y., Morita, R., Yamashita, M.: "Coherent optical control of molecular motion using polarized sequential pulses", Jpn. J. Appl. Phys., 43: 6448-6451 (2004)*
   2004
Toda, Y., Nakaoka, T., Morita, R., Yamashita, M., Inoue, T., Arakawa, Y.: "Selective excitation of self-assembled quantum dots by using shaped pulse", Physica E, 21: 180-183 (2004)*
   2004
Takeuchi, O., Aoyama, M., Oshima, R., Okada, Y., Oigawa, H., Sano, N., Morita, R., Yamashita, M., Shigekawa, H.: "Probing subpicosecond dynamics using pulsed laser combined scanning tunneling microscopy", Appl. Phys. Lett., 85: 3268-3270 (2004)*
   2004
Yamane, K., Kito, T., Morita, R., Yamashita, M.: "Experimental and theoretical demonstration of validity and limitations in fringe-resolved autocorrelation measurements for pulses of few optical cycles", Optics Express, 12: 2762-2773 (2004)*
   2004
Yamane Keisaku, Zhang Zhigang, Oka Kazuhiko, Morita Ryuji, Yamashita Mikio, Suguro Akira
Optics Letters   28(22) 2258-2260   Nov 2003
We compensated for chirp of optical pulses with an over-one-octave bandwidth (495-1090 nm; center wave-length of 655.4 nm) produced by self-phase modulation in a single argon-filled hollow fiber and generated 3.4-fs, 1.56 optical-cycle pulses (500...
NAKAMARU Shinki, KOYAMADA Yahei, KARASAWA Naoki, SONE Hiroyasu, MORITA Ryuji, YAMASHITA Mikio
IEICE transactions on communications   86(3) 449-458   Mar 2003
We have extended the finite-difference time-domain (FDTD) solution of Maxwell's equations to nonlinear propagation in a silica fiber. The combination of linear polarization, including all exact Sellmeier-fitting values, and nonlinear polarization,...
Fang Xiaojun, Karasawa Naoki, Morita Ryuji, Windeler Robert S., Yamashita Mikio
IEEE Photonics Technology Letters   15(2) 233-235   Feb 2003
The evolution of spectral and temporal profiles of 4.5 optical-cycle pulses propagating near zero-dispersion wavelength (ZDW) in a photonic crystal fiber is investigated experimentally and theoretically beyond the slowly varying-envelope approxima...
Toda, Y., Matsubara, T., Morita, R., Yamashita, M., Hoshino, K., Someya, T., Arakawa, T.: "Two-photon absorption and multiphoton-induced photoluminescence of bulk GaN excited below the middle of the band gap", Appl. Phys. Lett., 82: 4714-4716 (2003)*
   2003
Adachi, M., Hirasawa, M., Suguro, A., Karasawa, N., Kobayashi, S., Morita, R., Yamashita, M.: "Spectral-phase characterization and adapted compensation of strongly chirped pulses from a tapered fiber", Jpn. J. Appl. Phys., 42: L24-L26 (2003)*
   2003
Futaba, D. N., Morita, R., Yamashita, M., Tomiyama, S., Shigekawa, H.: "Site-selective silicon adatom desorption using femtosecond laser pulse pairs and scanning tunneling microscopy", Appl. Phys. Lett., 83: 2333-2335 (2003)*
   2003
YOSHIDA Shoji, TAKEUCHI Osamu, HATA Kenji, MORITA Ryuji, YAMASHITA Mikio, SHIGEKAWA Hidemi
Japanese journal of applied physics. Pt. 1, Regular papers & short notes   41(7B) 5017-5020   Jul 2002
The dynamics of a phase defect (P-defect) on the Si(100) surface was studied for the first time by scanning tunneling microscopy in pseudo-real time below 10K, using the repeated-line-scan technique in which single line scans are repeated on the s...
TAKEUCHI Osamu, MORITA Ryuji, YAMASHITA Mikio, SHIGEKAWA Hidemi
Japanese journal of applied physics. Pt. 1, Regular papers & short notes   41(7B) 4994-4997   Jul 2002
A promising design for achieving the ultimate spatial and temporal resolution is proposed. With modulation of the time delay between two femtosecond laser pulses repeatedly illuminating a scanning tunneling microscope junction, the induced compone...
NAKAMURA S.
IEEE Photon. Technol. Lett.   14(4) 480-482   Apr 2002
In order to both experimentally and numerically investigate nonlinear femtosecond ultrabroadband-pulse propagation in a silica fiber, we have extended the finite-difference time-domain (FDTD) calculation of Maxwell's equations with nonlinear terms...
NAKAMURA Shinki, LI Liming, KARASAWA Naoki, MORITA Ryuji, SHIGEKAWA Hidemi, YAMASHITA Mikio
Japanese journal of applied physics. Pt. 1, Regular papers & short notes   41(3A) 1369-1373   Mar 2002
An active chirp compensator consisting of a prism pair and a spatial-phase-modulating pulse shaper enables us to accurately measure the third-order dispersion (TOD) dependence of the interferometric autocorrelation trace while keeping the optimum ...
Hirasawa, M., Nakagawa, N., Yamamoto, K., Morita, R., Shigekawa, H., Yamashita, M.: "Sensitivity improvement of spectral phase interferometry for direct electric-field reconstruction for the characterization of low-intensity femtosecond pulses", Ap・・・
   2002
Hirasawa, M., Nakagawa, N., Yamamoto, K., Morita, R., Shigekawa, H., Yamashita, M.: "Sensitivity improvement of spectral phase interferometry for direct electric-field reconstruction for the characterization of low-intensity femtosecond pulses"...
Shibata, M., Hirasawa, M., Nakagawa, N., Morita, R., Suguro, A., Shigekawa, H., Yamashita, M.: "Experimental demonstration of phase-dispersion compensation for ultra-broadband femtosecond optical pulses generated by induced-phase modulation" Appl. Phy・・・
   2002
Shibata, M., Hirasawa, M., Nakagawa, N., Morita, R., Suguro, A., Shigekawa, H., Yamashita, M.: "Experimental demonstration of phase-dispersion compensation for ultra-broadband femtosecond optical pulses generated by induced-phase modulation" Appl...
KARASAWA N.
J. Opt. Soc. Am. B   18(11) 1742-1746   Nov 2001
We experimentally demonstrate the generation of 5.0-fs optical pulses (2.5μJ, 1-kHz repetition rate), using only a spatial light modulator for phase compensation. Pulse compression of the broadband pulse (500-1000 nm) from an argon-filled capillar...
LI Liming, KUSAKA Satoru, KARASAWA Naoki, MORITA Ryuji, SHIGEKAWA Hidemi, YAMASHITA Mikio
Japanese journal of applied physics. Pt. 2, Letters   40(7A) L684-L687   Jul 2001
The amplitude and phase of 5.0 fs optical pulses with an ultrabroad bandwidth from 480 to 835 nm were rapidly characterized by the spectral phase interferometry for direct electric-field reconstruction (SPIDER) technique. To our knowledge, this is...
Karasawa Naoki, Nakamura Shinki, Nakagawa Naoya, Shibata Masato, Morita Ryuji, Shigekawa Hidemi, Yamashita Mikio
IEEE Journal of Quantum Electronics   37(3) 398-404   Mar 2001
Wave-propagation equations, including effectively the second derivative in time under the condition of a small difference between the group and phase velocities and the first derivative in position ξ in the group velocity coordinate, are derived b...
Karasawa, N., Morita, R., Shigekawa, H. and Yamashita, M.: ``Characteristics of the Oscillatory Spectrum Due to Only Induced-Phase Modulation in an Argon-Filled Hollow Waveguide Accompanied with Intense Self-Phase Modulation", Opt. Commun., 197: 475-48・・・
   2001
Karasawa, N., Morita, R., Shigekawa, H. and Yamashita, M.: ``Characteristics of the Oscillatory Spectrum Due to Only Induced-Phase Modulation in an Argon-Filled Hollow Waveguide Accompanied with Intense Self-Phase Modulation", Opt. Commun., 197: 4...
Morita, R. Yamashita, M. Suguro A. and Shigekawa, H.:``Femtosecond-Time-Resolved Highly-Selective Molecular-Vibration Excitation Using a Novel Vibrationally-Synchronized Pumping Technique with Frequency-Difference Resonance", Opt. Commun., 197: 73・・・
   2001
Morita, R. Yamashita, M. Suguro A. and Shigekawa, H.:``Femtosecond-Time-Resolved Highly-Selective Molecular-Vibration Excitation Using a Novel Vibrationally-Synchronized Pumping Technique with Frequency-Difference Resonance", Opt. Commun., 197...
Miyake, K., Okawa, S., Takeuchi, O., Futaba, D. N., Morita, R., Yamashita, M. and Shigakawa, H.: ``Characteristic Structure of the Si(111)-7x7 Surface Step Studied by Scanning Tunneling Microscopy", J. Vac. Sci. Technol. A, 19: 1549-1552 (2001)*
   2001
Hirasawa, M., Nakagawa, N., Shibata, M., Morita, R., Shigekawa H. and Yamashita, M.:``Experimental Studies on Phase Characteristics of Ultrabroad-band Pulses Generated by Induced-Phase Modulation in a Fused-Silica Fiber", Technical Digest of Con・・・
   2001
Hirasawa, M., Nakagawa, N., Shibata, M., Morita, R., Shigekawa H. and Yamashita, M.:``Experimental Studies on Phase Characteristics of Ultrabroad-band Pulses Generated by Induced-Phase Modulation in a Fused-Silica Fiber", Technical Digest o...
Oyama, S., Miyake, K., Yasuda, S., Takeuchi, O., Sumaoka, J., Komiyama, M.,Futaba, D. N., Morita, R., Yamashita M. and Shigakawa, H.: ``Interactive Force Between Cyclodextrin Inclusion Complexes Studied by Atomic Force Microscopy",Jpn. J. Appl・・・
   2001
Oyama, S., Miyake, K., Yasuda, S., Takeuchi, O., Sumaoka, J., Komiyama, M.,Futaba, D. N., Morita, R., Yamashita M. and Shigakawa, H.: ``Interactive Force Between Cyclodextrin Inclusion Complexes Studied by Atomic Force Microscopy",Jpn. J....
MURAKAMI Hidetoshi, MORITA Ryuji, WATANABE Takashi, ASAI Keisuke, HONMA Itaru, ZHOU Haoshen, YAMASHITA Mikio, ISHIGURE Kenkichi, SHIGEKAWA Hidemi
Japanese journal of applied physics. Pt. 1, Regular papers & short notes   39(10) 5838-5841   Oct 2000
The absorption and electroabsorption(AE)spectra of 1-methyl-1'-octadecyl-2, 2'-cyanine perchlorate(S120)Langmuir-Blodgett films were measured. From these results, dispersion of the third-order nonlinear optical susceptibility χ^<(3)>(-ω ; 0, 0, ω)...
YAMAOKA Yoshihisa, MORITA Ryuji, YAMASHITA Mikio
Japanese journal of applied physics. Pt. 1, Regular papers & short notes   39(3A) 1170-1171   Mar 2000
We numerically analyze the group-velocity dispersion(GVD)effect of the nonlinear medium on the femtosecond time-resolved degenerate four-wave mixing(DFWM)signal with the third-order nonlinear delayed response. As a result, we find that material GV...
Karasawa Naoki, Morita Ryuji, Shigekawa Hidemi, Yamashita Mikio
Optics Letters   25(3) 183-185   Feb 2000
We experimentally demonstrate the generation of intense ultrabroadband optical pulses whose spectrum ranges from 300 to 1000 nm (700-THz bandwidth) with a well-behaved spectral phase and 23-μJ pulse energy by a novel, simple setup utilizing induce...
Kaikoh T., Miyake K., Li Y. J., Morita R., Yamashita M., Shigekawa H.: "Site preferences of oxygen and boron atoms during dissociative reaction of HBO/sub 2/ molecules onto the Si(111)-7*7 surface", Journal of Vacuum Science & Technology, 18: 1469-147・・・
   2000
Kaikoh T., Miyake K., Li Y. J., Morita R., Yamashita M., Shigekawa H.: "Site preferences of oxygen and boron atoms during dissociative reaction of HBO/sub 2/ molecules onto the Si(111)-7*7 surface", Journal of Vacuum Science & Technology, 18: 146...
Morita R., Kameya N., Yamashita M., Suguro A., Shigekawa H.: "Simultaneous coherent multicolor pulse shaping using two-dimensional spatial light amplitude- and phase-modulator for multi-selective wave-packet control", Nonlinear Optics: Materials, Fund・・・
   2000
Morita R., Kameya N., Yamashita M., Suguro A., Shigekawa H.: "Simultaneous coherent multicolor pulse shaping using two-dimensional spatial light amplitude- and phase-modulator for multi-selective wave-packet control", Nonlinear Optics: Materials,...
Murakami Hidetoshi, Morita Ryuji, Yamashita Mikio, Shigekawa Hidemi
Japanese journal of applied physics. Pt. 1, Regular papers & short notes   38(7A) 4056-4064   Jul 1999
The absorption and electroabsorption (EA) spectra for 4-(N, N-diethylamino)-4-nitrostyrene (DEANST)-doped poly(methylmethacrylate) (PMMA) films in the dopant concentration range of 0.1-40 wt% were measured. Dispersion of the third-order nonlinear ...
Yamashita Mikio, Kikuma Shinji, Yamaoka Yoshihisa, Murakami Hidetoshi, Morita Ryuji, Shigekawa Hidemi
Applied Physics Letters   75(1) 28-30   Jul 1999
The femtosecond second hyperpolarizability due to the nonresonant electronic polarization for two intramolecular charge-transfer molecules, 6-propionyl-2-dimethylamino naphthalene and 2-anilinonaphthalene-6-sulfonic acid which possess the great pe...
Hata Kenji, Morita Ryuji, Yamashita Mikio, Shigekawa Hidemi
Japanese journal of applied physics. Pt. 1, Regular papers & short notes   38(6B) 3837-3840   Jun 1999
The dynamical characteristics of the C defect at low temperature (80 K) were studied by sequential scanning tunneling microscopy observations. We found that the C defect frequently transforms into a another type of defect termed as the C^<LT>_2 de...
Sainoo Yasuyuki, Kimura Tomohiko, Morita Ryuji, Yamashita Mikio, Hata Kenji, Shigekawa Hidemi
Japanese journal of applied physics. Pt. 1, Regular papers & short notes   38(6B) 3833-3836   Jun 1999
The A defects on the Si(100) surface can be classified as A_1, A_2, and A_3 at low temperatures. We carried out scanning tunneling microscopy observations and scanning tunneling spectroscopy measurements at 〜80 K to study their electronic structur...
DATA Kenji, KIMURA Tomohiko, SAINOO Yasuyuki, MIYAKE Koji, MORITA Ryuji, YAMASHITA Mikio, SHIGEKAWA Hidemi
Japanese journal of applied physics. Pt. 1, Regular papers & short notes   38(5A) 2904-2909   May 1999
At 80K, not all the dimers of Si(100) appear buckled in the scanning tunneling microscopy (STM) images but a certain number of the dimers are observed in a symmetric configuration. We report on observations of a two-dimensional spontaneous fluctua...
Karasawa Naoki, Morita Ryuji, Xu Lin, Shigekawa Hidemi, Yamashita Mikio
Journal of the Optical Society of America B : Optical Physics   16(4) 662-668   Apr 1999
Generation of an ultrabroadband optical pulse with a fluent frequency dependency of the phase is important for creating a monocyclelike optical pulse and for shaping multiwavelength optical pulses. A previously proposed method that uses induced ph...
Miyake K., Oigawa, H., Hata, K., Morita, R., Yamashita, M., Shigekawa, H. :"Stability and Nuclear Formation of Si(111)-7x7 Structure as Determined from Charge Redistribution in Surface Layers" Surface Science, 429: 260-273 (1999)*
   1999
Xu, L. Karasawa, N. Nakagawa, N., Morita, R., Shigekawa H. and Yamashita, M.: "Experimental Generation of an Ultra-Broad Spectrum Based on Induced-Phase Modulation in a Single-Mode Glass Fiber", Opt. Commun., 162: 256-260 (1999)*
   1999
Murakami, H., Morita, R., Watanabe, T., Asai K. et al.(外5人): "Third-Order Nonlinear Optical Susceptibility Measurement in 1-Methyl-1'- Octadecyl-2,2'-Cyanine Perchlorate Langmuir-Blodgett Films by Means of Electroabsorption Spectroscopy", Mol. Cryst. &・・・
   1999
Murakami, H., Morita, R., Watanabe, T., Asai K. et al.(外5人): "Third-Order Nonlinear Optical Susceptibility Measurement in 1-Methyl-1'- Octadecyl-2,2'-Cyanine Perchlorate Langmuir-Blodgett Films by Means of Electroabsorption Spectroscopy", Mol. Cry...
Yamaoka, Y., Morita, R. and Yamashita, M.: "Group-Velocity Dispersion Effect on the Femtosecond Time-Dependent, Degenerative Four-Wave Mixing Signal near the Absorption Edge of 4-(N,N-diethylamino)-β-Nitrostyrene (DEANST) Solutions", Nonlinear Opt., 2・・・
   1999
Yamaoka, Y., Morita, R. and Yamashita, M.: "Group-Velocity Dispersion Effect on the Femtosecond Time-Dependent, Degenerative Four-Wave Mixing Signal near the Absorption Edge of 4-(N,N-diethylamino)-β-Nitrostyrene (DEANST) Solutions", Nonlinear Op...
Yamada, T., Miyake K., M. Ishida, Hata, K., Morita, R., Yamashita, M., Shigekawa, H.: " Long Range Ordering in the Graphite Intercalation Compounds", Synthetic Metals, 103: 2653-2654 (1999)*
   1999
Murakami, H. Morita, R, and Yamashita, M.: "Concentration Dependence Study of the Third-Order Nonlinearity in 4-(N,N-Diethylamino)-β-Nitrostyrene (DEANST) Doped Polymer Films by Use of Electroabsorption Spectroscopy", Nonlinear Opt., 22: 385-388 (1999)*
   1999
Morita, R., Yanagisawa, H., Yamashita M. and Oka, K.:"Femtosecond Optical Nonlinearity through a Two-Photon Process in Carotenoid Solutions", Nonlinear Opt., 22: 409-412 (1999)*
   1999
Yamashita Mikio, Sone Hiroyasu, Morita Ryuji, Shigekawa Hidemi
IEEE JOURNAL OF QUANTUM ELECTRONICS   34(11) 2145-2149   1998
Detailed numerical analysis of monocyclical optical pulse generation using induced-phase modulation between two-color carrier-phase-locked femtosecond pulses is presented. For the generation of a short pulse with a quasi-linear chirped white-conti...
Miyake, K., Akutsu, K., Yamada, T., Hata, K., Morita, R., Yamashita, M. and Shigekawa, H.: " Giant Superstructures Formed on Graphite Surface Treated with NaOHSolutions Studied by Scanning Tunneling Microscopy", Ultramicroscopy,73: 185-189 (1998)*
   1998
SATO Yasuhiro, MORITA Ryuji, YAMASHITA Mikio
Japanese journal of applied physics. Pt. 1, Regular papers & short notes   36(11) 6768-6774   Nov 1997
We propose a new femtosecond optical pulse compressor using a CS_2 liquid-core fiber with negative delayed nonlinear response through induced-phase modulation in a normal-dispersion region. We numerically confirm that, with a 23 kW, 100 fs pump pu...
SUEMURA Takuya, OHTANI Morimasa, MORITA Ryuji, YAMASHITA Mikio
Japanese journal of applied physics. Pt. 2, Letters   36(10A) L1307-L1310   Oct 1997
Change in the refractive index at around 630 nm in the femtosecond time region has been measured for the first time for a 75-wt% PbO-doped silica single-mode fiber with a highly sensitive, time-resolved interferometer using a heterodyne pump-probe...
SATO Yasuhiro, MORITA Ryuji, YAMASHITA Mikio
Japanese journal of applied physics. Pt. 1, Regular papers & short notes   36(4A) 2109-2115   Apr 1997
Fujiwara, T., Kamoshida, T., Morita, R. and Yamashita, M. : "Temporally-Separated Ultrafast-Emission Dynamics of Neutral and Cationic Molecules in Guanine and its Derivatives Aqueous Solutions", J. Photochem. Photobiol. B : Biol, 41 : 114-121 (1997)*
   1997
YAMASHITA Mikio, SONE Hiroyasu, MORITA Ryuji
Japanese journal of applied physics. Pt. 2, Letters   35(9B) L1194-L1197   Sep 1996
An approach for generation of an ultrabroad- band optical pulse (〜550 THz width) is proposed, which is based on mutual induced phase modulation of three synchronized femtosecond pulses in a short fiber. These pulses having equidistant carrier freq...
T. Itoh, R. Morita and M. Yamashita : "Extremely fast-response, highly nonlinear doped-silica single-mode fibers", Jpn. J. Appl. Phys., 35(9A) : L1107-L1110 (1996)*
   1996
Y. Yamaoka, T. Saito, Y. Sato, R. Morita and M. Yamashita : "Dynamics of third-order nonlinearity of nonresonant organic solutions by femtosecond pump-probe spectroscopy", Nonlinear Optics, 15(1-4) : 61-64(1996)*
   1996
T. Saito, Y. Yamaoka, Y. Kimura, R. Morita and M. Yamashita : "Femtosecond dynamics of nonresonant third-order optical nonlinearity of 1-(3-thienyl)-3-(4-chiorophenyl) propene-1-one crystal and solution", Jpn. J. Appl. Phys., 35(9A) : 126-130 (1996)*
   1996

Misc

 
重松恭平, 戸田泰則, 戸田泰則, 山根啓作, 山根啓作, 森田隆二, 森田隆二
応用物理学会学術講演会講演予稿集(CD-ROM)   73rd ROMBUNNO.13A-B2-3   Aug 2012
鈴木雅人, 山根啓作, 戸田泰則, 戸田泰則, 森田隆二, 森田隆二
応用物理学会学術講演会講演予稿集(CD-ROM)   73rd ROMBUNNO.13A-B2-2   Aug 2012
重松恭平, 戸田泰則, 戸田泰則, 森田隆二, 森田隆二
日本物理学会講演概要集   67(1) 796   Mar 2012
山根啓作, 戸田泰則, 森田隆二
応用物理学関係連合講演会講演予稿集(CD-ROM)   59th ROMBUNNO.18A-E9-9   Feb 2012
坂本盛嗣, 岡和彦, 森田隆二, 村上尚史
応用物理学関係連合講演会講演予稿集(CD-ROM)   59th ROMBUNNO.17A-A2-5   Feb 2012

Research Grants & Projects

 
Japan Science and Technology Agency: Strategic Basic Research Programs CREST Research Area
Project Year: Oct 2010 - Mar 2016    Investigator(s): MORITA Ryuji
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(B))
Project Year: 2008 - 2010    Investigator(s): Ryuji MORITA
Azobenzene single molecules before and after photo-isomerization were observed by a scanning tunneling microscopy. On the metal substrate with strong adsorption interaction, in-plane trans-azobenzene molecules were found, implying the inversion me...
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(A))
Project Year: 2004 - 2007    Investigator(s): Mikio YAMASHITA
We mainly studied the generation, measurement and control of mono-to few-optical-cycle fields (〜10-^<15>-s(1-fs) optical pulses), as follows:(1) the generation of 2.8 fs, 1.5-cycle isolated pulses by self-phase modulation(2) the generation of 2.6 ...
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(B))
Project Year: 2004 - 2006    Investigator(s): Ryuji MORITA
1.An over-one-octave spanning (460-1060 nm) ultra-broadband optical pulse was generated by self-modulation effect. It was spectrally-phase-compensated and characterized to be a 2.8 fs, 1.5 cycle-Fourier-transform-limited pulse by the modified spec...
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(B))
Project Year: 1999 - 2000    Investigator(s): Mikio YAMASHITA
As for the study on the optical-wave technology in the cycle-time region, the following results have been achieved experimentally : (1) 4.1-fs, 1.78-optical-cycle pulse compression using a novel chirp-compensation technique based on a spatial ligh...
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(試験研究(B), 基盤研究(A))
Project Year: 1994 - 1996    Investigator(s): Mikio YAMASHITA
The purpose of our study is to develop a highly-nonlinear device responding to femtosecond optical pulses and to find a method for optical pulse monocyclization to break through the present shortest pulse. Results of our study are summarized as fo...
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(一般研究(B), 基盤研究(B))
Project Year: 1994 - 1996    Investigator(s): Mikio YAMASHITA
The purpose of the present study is to develop a method for controlling quantum states in condensed matters using THz-repetition-rate optical pulses and to find suitable materials effectively controlled. Results of our study are summarized as foll...
ultrafast nonlinear optical phenomena, characterization and application of ultrashort optical pulses
Project Year: 1991   

Patents

 
Ultra-broadband, variable and multiple wavelength, pulse waveform shaping apparatus: Morita, R., Yamashita, M., Suguro, A., Morokawa, S. (2002)
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