Narrowband Ultra-Thin Metasurface Absorbers for subTHz Band and Their Application in Spectrometric Pyroelectric Detectors

The results of theoretical and experimental investigations of high-performance ultra-thin metasurface-based radiation absorbers designed for narrow-band operation in the range of 0.1-1 THz are presented. Implemented in a high-impedance surface configuration with a deep-subwavelength thin metal-backed polypropylene substrate, the absorbers are further used as the photo-sensitive layers in wavelength-selective pyroelectric sensors. The discrete and 1D-aray pyrodetectors applicable to measuring spectra of broadband subTHz sources are described.