115 citations · 156 across the 5 of their papers we have counts for
5 papers
Ultrafast intrinsic optical-to-electrical conversion dynamics in graphene photodetector
Katsumasa Yoshioka, Taro Wakamura, Masayuki Hashisaka +3
Optical-to-electrical (O-E) conversion in graphene is a central phenomenon for realizing anticipated ultrafast and low-power-consumption information technologies. However, revealin…
On-chip coherent frequency-domain THz spectroscopy for electrical transport
Katsumasa Yoshioka, Norio Kumada, Koji Muraki +1
We developed a coherent frequency-domain THz spectroscopic technique on a coplanar waveguide in the ultrabroad frequency range from 200 MHz to 1.6 THz based on continuous wave (CW)…
Observation of Photoinduced Terahertz Gain in GaAs Quantum Wells: Evidence for Radiative Two-Exciton-to-Biexciton Scattering
X. Li, K. Yoshioka, Q. Zhang +9
We have observed photoinduced negative optical conductivity, or gain, in the terahertz frequency range in a GaAs multiple-quantum-well structure in a strong perpendicular magnetic…
Active spatial control of terahertz graphene plasmons by tailoring carrier density profile
Ngoc Han Tu, Katsumasa Yoshioka, Satoshi Sasaki +3
Graphene offers a possibility for actively controlling plasmon confinement and propagation by tailoring its spatial conductivity pattern. However, implementation of this concept ha…
Terahertz Faraday and Kerr rotation spectroscopy of BiSb films in high magnetic fields up to 30 Tesla
Xinwei Li, Katsumasa Yoshioka, Ming Xie +16
We report results of terahertz Faraday and Kerr rotation spectroscopy measurements on thin films of , an alloy system that exhibits a semimetal-to-top…