A thermally reconfigurable metamaterial with switchable wideband absorption and sensing at THz band based on VO2 thin film

The VO2 thin film has the advantage of thermally controlled insulator-metal phase transition. Based on this, we presented a thermally reconfigurable metamaterial with switchable wideband absorption and sensing at THz band in this paper. At low temperature (sigma(VO2 )= 20 S/m), the metamaterial can realize nearly perfect absorption at the range of 6.88-9THz. When the temperature rises to a certain extent (sigma(VO2 )= 2 x 10(5 )S/m), an absorption peak which can be used to sensing appears at 4.08THz with the permittivity sensitivity of 0.5THz/PU. The metamaterial has the advantages of simple structure and switchable wideband absorption/sensing functions with potential application value on terahertz stealth, detection, sensing, and so on.