A thermal tunable terahertz metamaterial absorber based on strontium titanate

Abstract At present, the development of metamaterials is abundant. Scientists have developed plenty of metamaterials to meet the rich needs in medicine, military and so on. A temperature sensitive dual-band absorber made of strontium titanate(SrTiO 3 , STO) with stacked structure is designed, and the absorbance of double modes in the range of 0–0.25 THz exceeds 99%. The absorber is insensitive to polarization and could maintain good absorption efficiency at large angle incidence. As the temperature changes from 200 K to 400 K, the resonant frequency changes significantly, and the modulation depth exceeds 40%. The proposed thermal tunable absorber can be used in radiative heat measurement, biomedical and chemical sensing, photoelectric detection and other fields. It also can be used to make thermal tunable sensors, light modulators, Terahertz absorbers and other novel devices.