| Title |
Generation of Ultra-Wideband Terahertz Pulse by Photoconductive Antenna |
| Authors |
진윤식(Jin Yun-Sik) ; 김근주(Kim Geun-Ju) ; 손채화(Shon Chae-Hwa) ; 정순신(Jung Sun-Shin) ; 김지현(Kim Jeehyun) ; 전석기(Jeon Seok-Gy) |
| Keywords |
Terahertz(THz) Radiation ; Femtosecond Lase ; Photoconductive Antenna ; LT-GaAs ; Ultra-Wideband Radiation ; T-Ray Imaging |
| Abstract |
Terahertz wave is a kind of electromagnetic radiation whose frequency lies in 0.1THz ~10THz range. In this paper, generation and detection characteristics of terahertz (THz) radiation by photoconductive antenna (PCA) method has been described. Using modern integrated circuit techniques, micron-sized dipole antenna has been fabricated on a low-temperature grown GaAs (LT-GaAs) wafer. A mode-locked Ti:Sapphire femtosecond laser beam is guided and focused onto photoconductive antennas (emitter and detector) to generate and measure THz pulses. Ultra-wide band THz radiation with frequencies between 0.1 THz and 3 THz was observed. Terahertz field amplitude variation with antenna bias voltage, pump laser power, pump laser wavelength and probe laser power was investigated. As a primary application example. a live clover leaf was imaged with the terahertz radiation. |