Affiliation:
1. Yunnan University
2. Yunnan Agricultural University
Abstract
A dual-controlled tunable polarization-independent perfect absorber based on bulk Dirac semimetal (BDS) and strontium titanate (STO) is proposed and analyzed. The results show that the absorptivity can reach 99% at 1.26 THz due to the critical coupling effect. Meanwhile, the absorptivity and resonant frequency of the proposed absorber can be dual-tuned dynamically by varying the temperature of the STO and the Fermi energy of the BDS. Furthermore, the coupled mode theory (CMT) and the equivalent circuit model (ECM) are used to theoretically analyze the performance of the absorber. Finally, modulation of the absorptivity spectra by tailoring the structure dimensions is also discussed. This work provides potential applications in the design of dual-tunable filters and absorbers.
Funder
Yunnan Agricultural University offline first-class undergraduate courses
Yunnan Provincial Department of Science and Technology Agricultural Joint Special Project
National Natural Science Foundation of China
Subject
Atomic and Molecular Physics, and Optics,Statistical and Nonlinear Physics