Frequency response range of terahertz pulse coherent detection based on THz-induced time-resolved luminescence quenching

Abstract

It has been proposed previously that the coherent detection of a terahertz (THz) pulse can be achieved based on the time-resolved luminescence quenching. In this paper, we investigate the frequency response range of this novel detection technology by simulating the motion of carriers in gallium arsenide (GaAs) by the ensemble Monte Carlo method. At room temperature, for a direct-current (DC) voltage of 20 kV/cm applied to the semiconductor (GaAs) and sampling time of 140 fs, the luminescence quenching phenomena induced by terahertz pulses with different center frequencies are studied. The results show that the quenching efficiency is independent of the THz frequency when the frequency is in a range of 0.1 THz-4 THz. However, when the frequency exceeds 4 THz, the efficiency decreases with the increase of frequency. Therefore, the frequency response range is 0.1 THz-4 THz. Moreover, when the sampling time is changed to 100 fs, the frequency response range is extended to be approximately 0.1 THz-5.6 THz. This study of the frequency-dependent characteristics of the luminescence response to the THz pulse can provide a theoretical basis for the exploration of THz detection technology.

Scattering and absorption characteristics of non-spherical cirrus cloud ice crystal particles in terahertz frequency band*

“…The terahertz band has important applications in many research fields. [3][4][5][6] The ice cloud particle sizes are within the range of 30 µm-3000 µm wavelengths of the terahertz frequency band (0.1 THz-10 THz). [7] Therefore, the terahertz band is theoretically the best one for simultaneously detecting the horizontal and vertical structure of cirrus clouds.…”

Competitive and synergistic adsorption of binary volatile organic compound mixtures on activated carbon

“…QCM, which only requires a small amount of absorbent, offers short response times and allows for detection of mass changes. The terahertz (THz) wave bridges the gap between microwave and infrared, [14][15][16][17][18] which can evaluate adsorption process regarding intermolecular and intramolecular modes because the THz spectrum is sensitive to fluctuations in the dipole moment of organic compounds. [19][20][21][22][23] In this study, the adsorption process of four substances and two binary mixtures is studied by terahertz time domain spectroscopy (THz-TDS).…”