THz spatial filter integrating bimaterial switching for sensors

We propose a THz spatial filter using frequency selective surfaces (FSS) integrated with bimaterial actuator for switching. The actuator consists of two materials that have different thermal expansion rates and can be designed based on temperature tuning. The goal for this design is to develop high performance reconfigurable filters operating in the THz band. The filter was fabricated using gold as filter pattern on silicon substrate. SiO
₂
and Al were used as bimaterial actuators. Simulations show excellent transmittance (>80%). Allowing different gap of the actuator (up and down), the peak frequency can vary from 0.35 to 0.37 THz.