THz room-temperature detector based on thermoelectric frequency-selective surface fabricated from Bi88Sb12 thin film
Mikhail Khodzitsky, Anastasiia Tukmakova, Dmitry Zykov, Mikhail Novoselov, Ivan L. Tkhorzhevskiy, Artyom Sedinin, Anna V. Novotelnova, Anton Zaitsev, Petr Demchenko, Elena S. Makarova, N. S. Kablukova
Abstract
A room-temperature terahertz (THz) detector based on a thermoelectric frequency selective surface (FSS) has been numerically simulated, designed, fabricated, and tested. The FSS has been fabricated from a 150 nm thin Bi88Sb12 thermoelectric film with the engraved periodic Greek crosses. The detector prototype has been tested under the 0.14 THz radiation exposure and showed a voltage response due to the photo-thermoelectric effect up to 0.13–0.18 mV, and voltage responsivity equal to 14–20 mV/W. The detector based on the FSS has shown voltage responsivity up to three times higher in comparison with the detector based on the continuous film. Thermal imaging has shown a temperature increase in the FSS up to 1.5 K under the THz exposure. The obtained results demonstrate prospects for utilization of the Bi88Sb12 FSS detector as a low cost, compact, high-speed, highly sensitive room-temperature THz detector.