A5015984748- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Semiconductor Quantum Structures and Devices
- Semiconductor materials and devices
- Strong Light-Matter Interactions
- Photonic Crystals and Applications
- Astrophysical Phenomena and Observations
- Perovskite Materials and Applications
- Mechanical and Optical Resonators
- Organic Light-Emitting Diodes Research
- Thermal Radiation and Cooling Technologies
- Advancements in Semiconductor Devices and Circuit Design
- Semiconductor materials and interfaces
- Analytical Chemistry and Sensors
- Molecular Junctions and Nanostructures
- Stellar, planetary, and galactic studies
- Quantum and electron transport phenomena
- Force Microscopy Techniques and Applications
- Astronomy and Astrophysical Research
- Advanced X-ray Imaging Techniques
- Acoustic Wave Resonator Technologies
- Advanced Fiber Laser Technologies
- Gamma-ray bursts and supernovae
- Organic Electronics and Photovoltaics
- X-ray Spectroscopy and Fluorescence Analysis
Kyoto Institute of Technology
2016-2025
Isuzu Advanced Engineering Center (Japan)
2003-2024
The University of Tokyo
2019
University of Cambridge
2018
JEOL (Japan)
2014-2015
Kobe Steel (Japan)
1994-2015
Kumamoto University
2015
Nagaoka University
2014
Nagoya University
1999-2014
Nagaoka University of Technology
2009-2014
We numerically and experimentally demonstrated a higher-order topological state in three-dimensional (3D) photonic crystal (PhC) with complete band gap. Two types of cubic lattices were designed different invariants, which theoretically confirmed by the finite difference their Zak phases. Topological boundary states two-dimensional interfaces hinge one-dimensional corners formed according to higher order bulk-boundary correspondence. Microwave measurements fabricated 3D PhC containing two...
We experimentally demonstrated a circularly polarized cavity mode in GaAs-based chiral photonic crystal (PhC) containing planar defect. Low-temperature photoluminescence measurements of InAs quantum dots (QDs) embedded the defect revealed polarization bandgap for left-handed light near-infrared spectrum. Within this bandgap, where QDs preferably emitted right-handed light, we observed distinct peak characterized by circular (CP). This observation indicates that PhC modifies optical density...
Here we report two types of excited-state intramolecular proton transfer dyes featuring exceptionally high misciblity with a polymer matrix (> 50 wt%). Using these dyes, assemble spherical laser oscillators...
view Abstract Citations (104) References (32) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Abell 2163: Temperature, Mass, and Hydrostatic Equilibrium Markevitch, M. ; Mushotzky, R. Inoue, H. Yamashita, K. Furuzawa, A. Tawara, Y. Using ASCA data, we have measured the electron temperature in 2163 out to 1.5 h-1 Mpc (¾ of virial radius, or 10ax, where ax is X-ray core-radius) from center, three radial bins. The obtained temperatures are 12.2+1.9-1.2 keV,...
The temperature and abundance structure in the intracluster medium (ICM) of Hydra A Cluster galaxies is studied with ASCA ROSAT. effect large extended outskirts point-spread function X-ray telescope on included this analysis. In brightness profile, strong central excess above a single β model, identified Einstein ROSAT data, also found harder energy band (>4 keV). simultaneous fit five annular spectra taken GIS instrument shows radial distribution metal abundance. significant enhancement...
view Abstract Citations (75) References (12) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Discovery of X-ray bursts from AQL X-1. Koyama, K. ; Inoue, H. Makishima, Matsuoka, M. Murakami, T. Oda, Osgawara, Y. Ohashi, Shibazaki, N. Tanaka, Marshall, F. J. Kondo, I. S. Hayakawa, Kunieda, Makino, Masai, Nagase, Tawara, Miyamoto, Tsunemi, Yamashita, Two were observed the recurrent transient Aql X-1 during declining phase a nova-like flare. These exhibit common...
This Letter describes the fabrication and operation of a single-chip white-laser device. The laser device has multilayered structure consisting three layers. Each layer comprises polymer claddings waveguide core doped with organic dye. In each layer, grating corrugations were fabricated by UV-nanoimprint lithography that act as distributed-feedback cavity structures. Under optical pumping, lasing output red, green, blue colors was simultaneously obtained from sample edge.
Lead-halide perovskites are highly promising for various optoelectronic applications, including laser devices. However, fundamental photophysics explaining the coherent-light emission from this material system is so intricate and often subject of debate. Here, we systematically investigate photoluminescence properties all-inorganic perovskite microcavity at room temperature discuss excited state light-matter coupling regime depending on excitation density. Angle-resolved clearly exhibits...
Significant temperature variation is found from ASCA observations of the hot intracluster medium in Coma cluster galaxies. The whole out to 1° center was covered by 14 pointings. gas outside region estimated correcting for stray-light effect bright center. inferred lower than 4.5 keV west and higher 10 east, both offset 40' (1.6 Mpc H0 = 50 km s-1 Mpc-1) not explained a systematic error complex point-spread function X-ray telescope. azimuthal probably caused recent mergers may reflect an...
We have demonstrated near-infrared amplified spontaneous emission and laser from fluorinated-polyimide waveguides doped with an organic dye, 5,6-dichloro-2[8-(p-dimethylaminophenyl)-2,4-neopentylene-1,3,5,7-octatetraenyl]-3-ethylbenzothiazolium perchlorate (LDS950). The planar 1wt% of the 10mm in length 9.3μm thickness, exhibited optical gain around 960nm under pulse pumping. A good coefficient 1.4mm−1 was obtained. Furthermore, by using cleaved waveguide edges as reflective facets, sharp...
An extreme ultraviolet (XUV) scanner on board the Mars orbiter, Planet‐B, observed terrestrial plasmasphere while it was in a parking orbit around earth. The image available only for dusk side of plasmasphere. Nonetheless, this first from outside Future missions, such as NASA IMAGE mission 2000 well Japanese plasmaspheric imaging telescope SELENE 2003 will provide further information region.
view Abstract Citations (63) References (21) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Temperature and Iron Abundance Variation of the Gas in Perseus Cluster Arnaud, K. A. ; Mushotzky, R. F. Ezawa, H. Fukazawa, Y. Ohashi, T. Bautz, M. W. Crewe, G. B. Gendreau, C. Yamashita, Kamata, Akimoto, We present first two-dimensional map temperature iron abundance cluster. Analysis spectra obtained using Imaging Spectrometer on ASCA shows nonaxisymmetric...
view Abstract Citations (60) References (46) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Simultaneous optical and X-ray burst from 4U MXB 1636-53. Pedersen, H. ; Lub, J. Inoue, Koyama, K. Makishima, Matsuoka, M. Mitsuda, Murakami, T. Oda, Ogawara, Y. Ohashi, Shibazaki, N. Tanaka, Hayakawa, S. Kunieda, Makino, F. Masai, Nagase, Tawara, Miyamoto, Tsunemi, Yamashita, Kondo, I. Jernigan, G. van Paradijs, Beardsley, A. Cominsky, L. Doty, Lewin, W. Methods of...
view Abstract Citations (64) References (17) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Discovery of a large X-ray burst from an nova, Centaurus X-4. Matsuoka, M. ; Inoue, H. Koyama, K. Makishima, Murakami, T. Oda, Ogawara, Y. Ohashi, Shibazaki, N. Tanaka, Kondo, I. Hayakawa, S. Kunieda, Makino, F. Masai, Nagase, Tawara, Miyamoto, Tsunemi, Yamashita, The satellite Hakucho detected the nova-like transient Cen X-4 on May 31, 1979. time profile and spectral...
This paper describes a fabrication technique of polymeric distributed-feedback lasers using the photonanoimprint lithography. In devices with grating structure, which was imprinted directly onto active layer surface in vacuum, single-mode laser oscillations were easily obtained. The emission color can be controlled only by changing doping material and period master mold. It demonstrated that nanoimprint lithography would key technology for development multicolor light source.
Microcavity systems with organic luminescent materials have a hot prospect for room-temperature cavity-polariton devices. The polariton dispersion relation of microcavities is significantly different from that inorganic due to the strong localization Frenkel excitons. Also photoexcited particles will undergo cooling mechanism until they reach ground state. In characterization efficient condensates, therefore, dynamics as well kinetics eigenstate should be measured. Here we present...
Lead halide perovskites are promising materials for various optoelectronic device applications such as solar cells, light-emitting diodes, and lasers. Three-dimensional perovskites, example, CH3NH3PbI3 CsPbBr3, have been demonstrated to be high-gain active media low-threshold lasing. In contrast, layered (CH3(CH2)3NH3)2PbI4, known difficult show lasing oscillation especially at room temperature, despite their robustness the environment. Here we reveal bottleneck in through systematic...
We have investigated near-infrared light amplification in a dye-doped polymeric waveguide structure under optical pumping. Amplified spontaneous emission (ASE) at ∼800nm was observed poly(vinyl-pyrrolidone) thin film with organic dye LDS798. The ASE threshold energy as low ∼12μJ∕cm2, which is about one-tenth of previously reported values for infrared-dye-doped waveguides. This comes from large Stokes shift LDS798, the self-absorption suppressed.
Tactile array sensor of the micro-cantilevers embedded in elastomer has been fabricated to detect normal and 2-axes shear stresses. It is demonstrated that tactile with 3 times detective elements can be excellent yield. The element sensitive both stresses applied on entire surface. Moreover, it good directional characteristics so shown magnitude direction stress obtained by difference output voltages adjacent cantilevers. reproducibility for multiple measurement. from drastically changes...
We have achieved to observe vertical cavity surface emitting lasing (VCSEL) from an optically pumped organic single crystal. A vapor-grown thiophene/phenylene co-oligomer (TPCO) crystal with in-plane polarization component was used as the gain medium in optical microcavity. Since top and bottom surfaces of TPCO serve high-quality resonators, well-defined Fabry-Pérot resonance is achieved. Furthermore, by using high reflectivity distributed Bragg reflector resonator, we observed emissions a...
Vertical-cavity organic lasers are fabricated with melt-grown crystals of a cyano-substituted thiophene-phenylene co-oligomer. Due to lying molecular orientation, surface-emitting lasing is achieved even in the half-cavity crystal grown on distributed Bragg reflector (DBR) under optical pumping at room temperature. Anticrossing splits angle-resolved photoluminescence spectra suggest formation exciton-polaritons between cavity photons and confined Frenkel excitons. By constructing full-cavity...