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Inorganic Cryptand: Size‐Selective Strong Metallic Cation Encapsulation by a Disilicoicosatungstate (Si2W20) Polyoxometalate†

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Angewandte Chemie 2009年第38期121卷

作者： Akihiro Yoshida Yoshinao Nakagawa Kazuhiro Uehara Shiro Hikichi Noritaka Mizuno Department of Applied Chemistry School of Engineering The University of Tokyo 7‐3‐1 Hongo Bunkyo‐ku Tokyo 113‐8656 (Japan) Fax: (+81) 3‐5841‐7220 Core Research for Evolutional Science and Technology (CREST) Japan Science and Technology Agency (JST) 4‐1‐8 Honcho Kawaguchi Saitama 332‐0012 (Japan)

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Generation of ultrashort optical pulses using multiple coherent anti-Stokes Raman scattering in LiNbO3

Generation of ultrashort optical pulses using multiple coher...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Eiichi Matsubara Taro Sekikawa Mikio Yamashita Department of Applied Physics Core Research for Evolutional Science and TechnologyJapan Science and Technology Agency Hokkaido University Sapporo Japan

We demonstrate Fourier synthesis of multiple coherent anti-Stokes Raman scattering signals in a single crystal of LiNbO 3 at room temperature. Isolated pulses with 25-fs duration and 640-780-nm wavelength range are g... 详细信息

ISBN: (纸本)9781557528599

关键词： Optical pulse generation Optical pulses Raman scattering Signal generators Mirrors Gratings Pulse compression methods Isolation technology Chirp Nonlinear optics

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Nearly-octave broadband, high-powered optical parametric amplification toward monocycle regime

Nearly-octave broadband, high-powered optical parametric amp...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Keisaku Yamane Takashi Tanigawa Taro Sekikawa Mikio Yamashita Department of Applied Physics Core Research Evolutional Science and Technology Japan Science and Technology Agencyi Hokkaido University Sapporo Japan

We demonstrated the generation of 34-muJ, 14-fs optical pulses with an ultrabroad bandwidth (540-1000 nm) by the use of one angularly-dispersed non-collinear optical parametric amplifier.

ISBN: (纸本)9781557528599

We demonstrated the generation of 34-muJ, 14-fs optical pulses with an ultrabroad bandwidth (540-1000 nm) by the use of one angularly-dispersed non-collinear optical parametric amplifier.

关键词： Nonlinear optics Stimulated emission Pulse amplifiers Optical pulses Mirrors Optical pulse compression Optical pulse generation Optical pumping Bandwidth Diffraction gratings

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Enhanced formation of electron-hole droplets in diamond by a weak pulse injection

Enhanced formation of electron-hole droplets in diamond by a...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Junko Omachi Nobuko Naka Kosuke Yoshioka Makoto Kuwata-Gonokami Department of Applied Physics Graduate School of Engineering and Core Research for Evolutional Science and Technology JST University of Tokyo Bunkyo Tokyo Japan Department of Applied Physics Core Research for Evolutional Science and Technology (CREST) – JST Bunkyo-ku Tokyo Japan

The electron-hole droplets (EHD) formation in diamond is remarkably enhanced due to the irradiation by a weak pulse hundreds of picoseconds after a stronger excitation pulse.

ISBN: (纸本)9781557528599

The electron-hole droplets (EHD) formation in diamond is remarkably enhanced due to the irradiation by a weak pulse hundreds of picoseconds after a stronger excitation pulse.

关键词： Spectroscopy Silicon Temperature sensors Delay effects Optical pulses Excitons Germanium Equations Radiative recombination Spontaneous emission

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A 648-pixel, two-dimension spatial light modulator with an over-two-octave bandwidth from ultraviolet to near-infrared

A 648-pixel, two-dimension spatial light modulator with an o...

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Conference on Lasers and Electro-Optics (CLEO)

作者： K. Hazu N. Nakagawa Sh. b. Fang Y. Nakano T. Sekikawa M. Yamashita Department of Applied Physics Japan Science and Technology Agency Hokkaido University and Core Research for Evolutional Science and Technology Sapporo Japan

We developed a 648-pixel, two-dimension spatial light modulator operating from 260 to 1100 nm, which is useful for ultrabroadband chirp compensation.

ISBN: (纸本)9781557528599

We developed a 648-pixel, two-dimension spatial light modulator operating from 260 to 1100 nm, which is useful for ultrabroadband chirp compensation.

关键词： Optical modulation Bandwidth Pulse modulation Phase modulation Space vector pulse width modulation Optical pulse generation Pulse measurements Chirp modulation Optical feedback Optical pulse shaping

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Enhanced optical activity of a terahertz wave with complimentary double-layered metal chiral gratings

Enhanced optical activity of a terahertz wave with complimen...

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Conference on Lasers and Electro-Optics (CLEO)

作者： N. Kanda K. Konishi M. Kuwata-Gonokami Department of Applied Physics Core Research for Evolutional Science and Technology (CREST) University of Tokyo Bunkyo Tokyo Japan

We demonstrate polarization rotation of a terahertz electromagnetic wave with complimentary double-layered metal chiral gratings. We obtain an isotropic polarization rotation free from the birefringence of the structu... 详细信息

ISBN: (纸本)9781557528599

关键词： Gratings Optical polarization Optical sensors Optical films Polarimetry Electromagnetic wave polarization Birefringence Optical surface waves Plasmons Infrared spectra

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Evaluation of density-dependent lifetime of 1s paraexcitons in Cu2O by cw laser based excitonic Lyman spectroscopy

Evaluation of density-dependent lifetime of 1s paraexcitons ...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Kosuke Yoshioka Takuro Ideguchi Makoto Kuwata-Gonokami Department of Applied Physics Solution-Oriented Research for Science and Technologyand Core Research for Evolutional Science and Technology University of Tokyo Bunkyo Tokyo Japan

The lifetime and the Auger coefficient for 1s paraexctons in Cu 2 O from 5 K to 70 K was measured directly using excitonic Lyman spectroscopy. A possible experiment for realizing excitonic Bose-Einstein condensation i... 详细信息

ISBN: (纸本)9781557528599

关键词： Spectroscopy Absorption Density measurement Laser excitation Infrared spectra Excitons Luminescence Temperature Laser transitions Probes

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Thermal distribution of Cu2O paraexcitons in a strain-induced trap probed by excitonic Lyman spectroscopy

Thermal distribution of Cu2O paraexcitons in a strain-induce...

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Conference on Lasers and Electro-Optics (CLEO)

作者： E. Chae K. Yoshioka T. Ideguchi N. Naka M. Kuwata-Gonokami Department of Applied Physics Solution Oriented Research for Science and Technology (SORST)-JST and Core Research for Evolutional Science and Technology (CREST)-JST University of Tokyo Bunkyo Tokyo Japan

We observe the signal of trapped paraexcitons in Cu 2 O by using CW excitonic Lyman spectroscopy. The temperature dependence of the 1s-2p induced absorption of paraexcitons indicates the presence of a strain-induced t... 详细信息

ISBN: (纸本)9781557528599

关键词： Spectroscopy Absorption Temperature dependence Probes Infrared spectra Capacitive sensors Excitons Cooling Stress Laser modes

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Predominant magnetic states in the Hubbard model on anisotropic triangular lattices

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Physical Review B 2008年第21期77卷 214505-214505页

作者： T. Watanabe H. Yokoyama Y. Tanaka J. Inoue Department of Applied Physics Nagoya University Nagoya 464-8603 Japan Core Research for Evolutional Science and Technology Japan Science and Technology Cooperation Japan Department of Physics Tohoku University Sendai 980-8578 Japan

By using an optimization variational Monte Carlo method, we study the half-filled-band Hubbard model on anisotropic triangular lattices, as a continuation of the preceding study [T. Watanabe, H. Yokoyama, Y. Tanaka, and J. Inoue, J. Phys. Soc. Jpn. 75, 074707 (2006)]. We introduce two new trial states: (i) A coexisting state of ΨQco-antiferromagnetic (AF) and a d-wave singlet gaps, in which we allow for a band renormalization effect, and (ii) a state with an AF order of 120° spin structure. In both states, a first-order metal-to-insulator transition occurs at smaller U/t than that of the pure d-wave state. In insulating regimes, magnetic orders always exist; an ordinary (π,π)-AF order survives up to t′/t∼0.9 (U/t=12), and a 120°-AF order becomes dominant for t′/t. The regimes of the robust superconductor and of the nonmagnetic insulator the preceding study proposed give way to these magnetic domains.

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GW approximation with LSDA+U method and applications to NiO, MnO, and V2O3

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Physical Review B 2008年第15期78卷 155112-155112页

作者： S. Kobayashi Y. Nohara S. Yamamoto T. Fujiwara Department of Applied Physics The University of Tokyo Tokyo 113-8656 Japan Core Research for Evolutional Science and Technology–Japan Science and Technology Agency (CREST-JST) Kawaguchi 332–0012 Japan Center for Research and Development of Higher Education The University of Tokyo Tokyo 113-0033 Japan

A GW approximation (GWA) method named U+GWA is proposed, where we can start GWA with more localized wave functions obtained by the local spin-density approximation (LSDA)+U method. Then GWA and U+GWA are applied to MnO, NiO, and V2O3 in antiferromagnetic phase. The band gaps and energy spectra show excellent agreement with the experimentally observed results and are discussed in detail. The calculated width of d bands of V2O3 is much narrower than that of the observed one which may be a mixture of t2g2 multiplet and single-electron t2g level. GWA or U+GWA does not work also in the paramagnetic phase of V2O3 and the reason for this is clarified. The method of the unique choice of on-site Coulomb interaction is discussed in detail. The criterion for whether we should adopt GWA or U+GWA is discussed and is assessed with the help of the off-diagonal elements of the self-energy.

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