Ultra-broadband origami absorber with large angle stability in the THz region

Abstract

A three-dimensional origami-structured absorber based on V O 2 is designed. The unit structures of the origami absorber are folded from both sides to the middle, and a cavity is formed. After simulation, it is found that this absorber possesses insensitivity to polarized electromagnetic waves and stability at large incident angles. In addition, the origami absorber exhibits good absorption performance at low frequencies. An absorption band with absorptivity over 0.9 at 0.61–6.5 THz can be formed in TE mode. The coverage of the absorption band exceeds 10 octaves, and the relative bandwidth is 165.7%. In TM mode, the absorption band is located at 0.68–6.5 THz, which exceeds 9.5 octaves, and the relative bandwidth is 162.1%. We demonstrate the absorption mechanism by analyzing the electric field, surface current, and magnetic field distribution.