A dynamically temperature tunable broadband infrared absorber with cross square nanocolumn arrays

A dynamically tunable broadband infrared absorber is designed by integrating VO₂/SiO₂/VO₂ nanocolumn array on Al₂O₃ substrate with W/VO₂/W nanocolumn array on W substrate. The absorption rates under different structural parameters and temperatures are simulated by using finite-difference time-domain method. The absorption rate can be dynamically adjusted through thermally induced VO₂ phase transition. The absorber is polarization independent under perpendicular incidence and possesses wide incidence angle absorption characteristics. It has good application prospects in the fields of thermal photoelectric devices.