Abstract

In this Letter, we propose a broadband near-infrared (NIR) absorber based on the phase transition material VO₂. By designing different arrangements of the VO₂ square lattice at high and low temperatures on fused silica substrates, the absorption rate reaches more than 90% in the entire 1.4–2.4 μm range. Using a finite-difference time-domain simulation method and thermal field analysis, the results prove that the absorber is polarization-independent and has wide-angle absorption for incident angles of 0°–70°. The proposed absorber has a smoother absorption curve and is superior in performance, and it has many application prospects in remote sensing geology.

© 2020 Chinese Laser Press

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