THz spatial filter employing bimaterial switching for temperature sensing
Sanphuang, V. ; Nahar, N. K. ; Volakis, J. L.
We propose a THz spatial filter using frequency selective surfaces (FSS) integrated with bimaterial actuator for temperature sensing. The actuator consists of two materials that have different thermal expansion rates and controlled based on temperature tuning. In this paper, we develop reconfigurable filters operating in the THz band that subjected to the temperature gradient of the surrounding medium. The filter was fabricated using gold to create the filter pattern printed on silicon substrate. SiO2 and Al were used as bimaterial actuators. The equivalent circuit was extracted and demonstrated. Measurement and simulation results show good agreement with excellent transmittance (>80%). According to different gap of the actuator (up and down), the peak frequency is varied from 0.36 to 0.34 THz. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:168–171, 2017