A5057605650- Terahertz technology and applications
- Spectroscopy and Laser Applications
- Photonic and Optical Devices
- Semiconductor Quantum Structures and Devices
- Spectroscopy and Quantum Chemical Studies
- Laser-Matter Interactions and Applications
- Photonic Crystals and Applications
- Osteoarthritis Treatment and Mechanisms
- Advanced Fiber Laser Technologies
- Semiconductor materials and interfaces
- Metamaterials and Metasurfaces Applications
- Chalcogenide Semiconductor Thin Films
- Plasmonic and Surface Plasmon Research
- Gyrotron and Vacuum Electronics Research
- Superconducting and THz Device Technology
- Perovskite Materials and Applications
- Solid-state spectroscopy and crystallography
- Knee injuries and reconstruction techniques
- Strong Light-Matter Interactions
- Acoustic Wave Resonator Technologies
- Advanced Thermoelectric Materials and Devices
- Thermography and Photoacoustic Techniques
- Advancements in Solid Oxide Fuel Cells
- Gas Sensing Nanomaterials and Sensors
- Magneto-Optical Properties and Applications
Osaka University
2016-2025
National Cancer Research Institute
2024
Canon (Japan)
2023
Panasonic (Japan)
2018-2023
Asahi General Hospital
2016-2022
Toyon (United States)
2020
Osaka City University
2014-2019
Osaka Dental University
2019
Duke University Hospital
2019
Duke Medical Center
2019
Humans use a family of more than 400 olfactory receptors (ORs) to detect odors, but there is currently no model that can predict perception from receptor activity patterns. Genetic variation in human ORs abundant and alters function, allowing us examine the relationship between function perception. We sequenced OR repertoire 332 individuals examined how genetic affected 276 phenotypes, including perceived intensity pleasantness 68 odorants at two concentrations, detection thresholds three...
The ferroelectric soft mode in a SrTiO(3) thin film was impulsively driven to large amplitude using intense picosecond terahertz pulses. As the electric field increased, soft-mode absorption peak exhibited blueshifting and spectral narrowing. A classical anharmonic oscillator model suggests that induced displacement is comparable of phase transition. narrowing indicates exceeds by any inhomogeneities film, demonstrating method can be used explore intrinsic quartic anharmonicity.
We generated an ultrabroadband infrared pulse ranging from far to 200 THz through a plasma by focusing hollow-fiber compressed intense 10-fs and its second harmonic in air. coherently detected the signal up 100 with electro-optic sampling clarified drastic dependence on orientation of crystal range 100–200 HgCdTe detector. From these, we confirmed whole frequency components originated AC biased were phase locked. This result opens possibility pump-probe spectroscopy which covers range.
We present a review of the recent progress in generation methods intense terahertz (THz) single-cycle pulses and their application to THz nonlinear spectroscopy condensed matters. Special attentions are paid various aspects nonlinearity semiconductors including dynamical Franz-Keldysh effect, ballistic acceleration free carriers, coherent control exciton system.
We present a novel technique for time-domain attenuated total reflection spectroscopy in the terahertz (THz) frequency region. The advantage of this is that it can be used to access samples with various shapes and optical properties without changing setup. applied determine complex dielectric constants InAs distilled liquid water.
We report the generation and detection of a terahertz wave with nonresonant electro-optical crystal using 1.56μm femtosecond laser pulses. Using 0.5-mm-thick (110)-oriented GaAs wafer for optical rectification modulation, we detected spectral sensitivity below 3THz. also estimated availability from viewpoint an coefficient phase match condition.
We experimentally demonstrated 20 ladder climbing steps on the anharmonic intermolecular potential in amino-acid microcrystals with an intense monocycle terahertz pulse. Absorption spectra show suppression of peak and enhancement low-frequency absorption for incident electric field amplitude. These results are reproduced by simulations based coherent transition processes between quantum levels potential. The appearance such nonlinearity allows us to control macroscopic motion via a phase-controlled
This study aimed to investigate subchondral bone changes using micro-computed tomography (micro-CT) and regional differences in articular cartilage degeneration, focusing on of covered by menisci, the early phase a destabilization medial meniscus (DMM) model.The DMM model was created as an experimental rat osteoarthritis (OA) (12 weeks old; n = 24). At 1, 2, 4 after surgery, rats were sacrificed, knee joints scanned Micro-CT system. Histological sections tibial plateau, which divided into...
We demonstrate, to the best of our knowledge, a novel generation process terahertz (THz) electromagnetic wave via noncollinear χ(2) in LiNbO3 with phase-front-controlled femtosecond Ti:sapphire laser pulse. Systematic measurements both THz electric field and excitation transmitted through an crystal at different powers show that maximum amplitude increases nonlinearly above critical input powers. This enhancement optical rectification efficiency is attributed distortion pulse shape...
We have investigated the dynamic optical properties of CH3NH3PbI3 (MAPbI3) perovskite thin films at low temperatures using time-resolved photoluminescence, transient absorption (TA), and THz TA spectroscopy. Optical spectroscopic results indicate that high-temperature tetragonal phase still remains in MAPbI3 addition to major orthorhombic phase. The fast charge transfer from is likely suppress formation excitons Consequently, near-band-edge responses photocarriers both phases are more...
We performed terahertz time-domain spectroscopy for methylammonium (MA) lead halide perovskite single crystals and characterized the longitudinal optical (LO) phonons directly. found that effective LO phonon wave number does not change in wide temperature range between 10 300 K. However, coupling MA cation modes mode derived from cages induces a splitting at low temperatures damping of high temperatures. These results influence interpretation electron-LO interactions semiconductors, as well...
We studied the interaction of excitons with terahertz (THz) electric fields in ZnSe/ZnMgSSe multiple quantum wells THz-pump and optical-probe spectroscopy. The incident THz pulse a peak field $\ensuremath{\sim}70\text{ }\text{kV}/\text{cm}$ induces strong spectral modulations heavy-hole light-hole excitonic absorption resonances. dependence resonance energy on follows Stark effect for smaller fields. For larger fields, shift deviates from effect, which implies that enters nonperturbative regime.
Abstract We have designed, fabricated and experimentally characterized a lens for the THz regime based on artificial dielectrics. These are man-made media that mimic properties of naturally occurring dielectric media, or even manifest cannot generally occur in nature. For example, well-known property, refractive index, which usually has value greater than unity, can less unity an dielectric. our lens, artificial-dielectric medium is made up parallel stack 100 μm thick metal plates form array...
Abstract As terahertz (THz) frequencies correspond to those of the intermolecular vibrational modes in a polymer, intense THz wave irradiation affects macromolecular polymorph, which determines polymer properties and functions. photon energy is quite low compared covalent bond energy; therefore, conformational changes can be induced “softly,” without damaging chemical structures. Here, we irradiate poly(3-hydroxybutylate) (PHB) / chloroform solution during solvent casting crystallization...
We report on the observation of electron-hole ( e-h) liquid (EHL) in diamond by time-resolved luminescence measurements under an intense femtosecond photoexcitation above band gap. The EHL is observed below e-h plasma band, showing a finite rise time several tens picoseconds. time, which corresponds to nucleation and growth droplets, plummets approaching critical temperature. Time-resolved spectral shape analysis reveals very high carrier density 1x10(20) cm(-3) temperature T(c) = 165 K EHL.