Cherenkov-Phase-Matched Nonlinear Optical Detection and Generation of Terahertz Radiation via GaAs With Metal-Coating

• Main Authors: Delos Santos, Ramon M, Ozawa, Shinpei, Magusara, Valynn, Azuma, Syougo, Tuico, Anthony, Copa, Vernalyn, Salvador, Arnel, Yamamoto, Kohji, Somintac, Armando, Kurihara, Kazuyoshi, Kitahara, Hideaki, Tani, Masahiko, Estacio, Elmer
• Format: text
• Published: Archīum Ateneo 2016
• Subjects: Optics; Physics
• Online Access: https://archium.ateneo.edu/physics-faculty-pubs/104; https://archium.ateneo.edu/cgi/viewcontent.cgi?article=1121&context=physics-faculty-pubs
• Institution: Ateneo De Manila University

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.