Open AccessCherenkov-phase-matched nonlinear optical detection and generation of terahertz radiation via GaAs with metal-coating
Author(s) -
Ramon delos Santos,
Shinpei Ozawa,
Valynn Katrine Mag-usara,
Syougo Azuma,
Anthony Tuico,
Vernalyn Copa,
A. Salvador,
Kohji Yamamoto,
Kazuyoshi Kurihara,
Hideaki Kitahara,
Masahiko Tani,
Elmer Estacio
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.024980
Subject(s) - terahertz radiation , materials science , cherenkov radiation , optics , optoelectronics , coating , wafer , waveguide , wavelength , refractive index , detector , physics , composite material
Terahertz (THz) wave detection and emission via Cherenkov-phase-matched nonlinear optical effects at 1.55-μm optical wavelength were demonstrated using a GaAs with metal-coating (M-G-M) and bare GaAs as a reference sample in conjunction with a metallic tapered parallel-plate waveguide (TPPWG). The metal-coated GaAs is superior to the bare wafer both as a THz electro-optic detector and as an emitter. Significant improvements in the detection and emission efficiency were obtained by utilizing a metal-coating due to better confinement and lower loss of the THz waves propagating in the M-G-M compared with bare GaAs.