3 citations · 3 across the 2 of their papers we have counts for
4 papers
Hot carrier dynamics and electron-optical phonon coupling in photoexcited graphene via time-resolved ultrabroadband terahertz spectroscopy
Sho Ikeda, Chiko Otani, Masatsugu Yamashita
Electron-electron (e-e) interaction is known as a source of logarithmic renormalizations for Dirac fermions in quantum field theory. The renormalization of electron--optical phonon…
Intrinsic and extrinsic effects on intraband optical conductivity of hot carriers in photoexcited graphene
Masatsugu Yamashita, Chiko Otani
We present a numerical study on the intraband optical conductivity of hot carriers at quasi-equilibria in photoexcited graphene based on the semiclassical Boltzmann transport equat…
Closed-form formulae of hyperbolic metamaterial made by stacked hole-array layers working at terahertz or microwave radiation
Piyawath Tapsanit, Masatsugu Yamashita, Chiko Otani +2
A metamaterial made by stacked hole-array layers known as a fishnet metamaterial behaves as a hyperbolic metamaterial at wavelength much longer than hole-array period. However, the…
Quasi-analytical solutions of hybrid platform and the optimization of highly sensitive thin-film sensors for terahertz radiation
Piyawath Tapsanit, Masatsugu Yamashita, Teruya Ishihara +1
We present quasi-analytical solutions (QANS) of hybrid platform (HP) comprising metallic grating (MG) and stacked-dielectric layers for terahertz (THz) radiation. The QANS are vali…