Development of simulation tool for the detection of terahertz signals based on microstructural photoconductive antenna

In order to obtain the terahertz detection signal as accurately as possible, a numerical simulation tool for terahertz signal reception is developed in this paper. The numerical simulation tool with the full-wave finite-difference time-domain (FDTD) method in three dimensions (3D) that couple multi-physics together is capable of getting the Terahertz detection signals. The carrier distribution effect of the incident femtosecond laser interacting with terahertz on the detector is analyzed briefly, and the simulation tool is validated by comparing the incident terahertz signal with the detected terahertz signal by using the low temperature growth GaAs substrate. The results show that the simulation tool developed in this paper is of great significance to the terahertz detection of micro-structure photoconductive antenna.