Tunable ultra-wideband polarization insensitivity wide-angle perfect THz absorber based on metamaterials containing vanadium dioxide

• Published in: Applied physics. A, Materials science & processing Materials science & processing, 2023-09, Vol.129 (9), Article 644
• Main Authors: Zhang, Pingsheng, Qin, Kaipeng, Deng, Xin-Hua, Liu, Hongfei, Yuan, Jiren
• Format: Article
• Language: English
• Subjects: Absorbers; Absorbers (materials); Absorption; Applied physics; Broadband; Characterization and Evaluation of Materials; Condensed Matter Physics; Electric dipoles; Electric fields; Machines; Manufacturing; Materials science; Metamaterials; Modulators; Nanotechnology; Optical and Electronic Materials; Phase transitions; Physics; Physics and Astronomy; Polarization; Processes; Surfaces and Interfaces; Switches; Thin Films; Ultrawideband; Vanadium dioxide; Vanadium oxides
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-023-06918-1

In this paper, a dynamically tunable ultra-broadband metamaterial perfect absorber (MPA) containing vanadium dioxide ( V O 2 ) is proposed and verified. The simulation results show that the MPA designed by us can not only achieve more than 90% absorption in the ultra-wideband range of 4.5–10 THz, but also achieve more than 99% perfect absorption in the wideband range of 5.5–8.3 THz. And the high absorption rate is caused by electric dipole resonance, which can be demonstrated by the distribution of the electric field. By adjusting the conductivity of V O 2 from 200 to 4 × 10 4 S/m through changing the temperature to induce the phase transition of V O 2 , one can continuously adjust the absorption of the proposed MPA from 16 to 100%. Furthermore, the proposed structure can achieve perfect absorption in a wide range of angles with TE polarization within 60°and TM polarization within 50°, which can effectively promote the development of THz devices, such as optical switches and modulators.