FEM Simulation of Frequency-Selective Surface Based on Thermoelectric Bi-Sb Thin Films for THz Detection

Terahertz (THz) filters and detectors can find a wide application in such fields as: sensing, imaging, security systems, medicine, wireless connection, detection of substances. Thermoelectric materials are promising basis for THz detectors’ development due to their sensitivity the radiation, possibility be heated under radiation produce voltage Seebeck effect. thin films Bi-Sb solid solutions semimetals/semiconductors with band gap comparable energy high thermoelectric conversion efficiency at room temperature. Detecting film surface transformed into periodic frequency selective (FSS) that operate as filter increases absorption radiation. We report first time about simulation detector based on thin-filmed frequency-selective surface. show structure both filter. Moreover, it was shown FSS design not only heating but temperature gradient by two orders magnitude comparison continuous films. Local gradients reach values order 100 K·mm−1. That opens new perspectives increase. Temperature difference formed 1 degree. Frequency-transient calculations power dependence characteristic saturation times around several ms. points perspective reaching fast response structures.