Simulation of terahertz signal reception detection based on field enhancement

Zhonggang Xiong; Deqing Liu; Liping Shang; Zhong Liu

doi:10.1117/12.3014291

29 December 2023 Simulation of terahertz signal reception detection based on field enhancement

Zhonggang Xiong, Deqing Liu, Liping Shang, Zhong Liu

Proceedings Volume 12975, 6th Optics Young Scientist Summit (OYSS 2023); 1297506 (2023) https://doi.org/10.1117/12.3014291
Event: 6th Optics Young Scientist Summit, 2023, Changsha, China

Abstract

Simulations of terahertz signals in the time or frequency domain focus on the photoconductive antenna (PCA). However, they lack a simpler and more accurate simulation technology for PCA, which plays a crucial role in designing and optimizing detectors. Such work is essential in terahertz imaging and time-domain spectroscopy (THz-TDS). This work simulates an incident terahertz wave by introducing a three-dimensional (3-D) finite-difference time-domain (FDTD) simulation in the form of a total field to scattering field. This wave is pretreated as a plane wave that is incident on the receiver. The equation of carrier dynamics with semiconductor charge and transport is solved by using the 3-D full-wave FDTD method. A center surface current method is used to calculate the time-varying conductivity. A sampling electric field was used to evaluate the photocurrent. They were obtained by convolving the main time-varying photoconductivity of the photoexcited carrier distribution on the cross-section in the middle of the gap of a PCA receiver. Then, we compare these simulations with previously reported data from an incident terahertz signal. In addition, we simulated the detection characteristics with other results in the literature. Our simulation tool can accurately reproduce these data sets. These simulations can be used to design and optimize the receiving performance of different PCAs structures before costly fabrication has commenced.

Citation Download Citation

Zhonggang Xiong, Deqing Liu, Liping Shang, and Zhong Liu "Simulation of terahertz signal reception detection based on field enhancement", Proc. SPIE 12975, 6th Optics Young Scientist Summit (OYSS 2023), 1297506 (29 December 2023); https://doi.org/10.1117/12.3014291

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