Title :
Coherent detection of mid-infrared radiation up to 60 THz with an LT-GaAs photoconductive antenna
Author :
Kono, S. ; Tan, M. ; Sakai, K.
Author_Institution :
Commun. Res. Lab., Kansai Adv. Res. Center, Japan
fDate :
6/1/2002 12:00:00 AM
Abstract :
The shaker modulation technique is demonstrated for ultrabroadband detection of terahertz (THz) radiation with a low-temperature-grown GaAs photoconductive (PC) antenna gated with 15 fs laser pulses. The differentiation of the time-resolved waveforms with the shaker modulation is advantageous to enhance the high-frequency components of the detected radiation without degrading the signal-to-noise ratio (SNR) because the PC response function determined by the temporal profile of the gating carrier number rapidly decreases with the increase in frequency. With the quantitative comparison of SNR between PC and electro-optic detection, the PC detection of radiation with the shaker modulation technique is promising for further spectroscopic application. The detection of radiation up to 60 THz is demonstrated
Keywords :
gallium arsenide; high-speed optical techniques; optical modulation; optical noise; photoconducting devices; photoconducting materials; submillimetre wave antennas; submillimetre wave detectors; 15 fs; GaAs; GaAs photoconductive antenna; LT-GaAs photoconductive antenna; PC response function; THz radiation detection; coherent detection; detected radiation; differentiation; electro-optic detection; fs laser pulses; gating carrier number; high-frequency components; low-temperature-grown; mid-infrared radiation detection; shaker modulation technique; signal-to-noise ratio; spectroscopic application; temporal profile; time-resolved waveforms; ultrabroadband detection;
Journal_Title :
Optoelectronics, IEE Proceedings -
DOI :
10.1049/ip-opt:20020262
