Study on electromagnetically induced transparency effects in Dirac and VO$_2$ hybrid material structure
Abstract
In this paper, we present a metamaterial structure of Dirac and vanadium dioxide and investigate its optical properties using the finite-difference time-domain (FDTD) technique. Using the phase transition feature of vanadium dioxide, the design can realize active tuning of the PIT effect at terahertz frequency, thereby converting from a single PIT to a double PIT. When VO is in the insulating state, the structure is symmetric to obtain a single-band PIT effect; When VO is in the metallic state, the structure turns asymmetric to realize a dual-band PIT effect. This design provides a reference direction for the design of actively tunable metamaterials. Additionally, it is discovered that the transparent window's resonant frequency and the Dirac material's Fermi level in this structure have a somewhat linear relationship. In addition, the structure achieves superior refractive index sensitivity in the terahertz band, surpassing 1 THz/RIU. Consequently, the concept exhibits encouraging potential for application in refractive index sensors and optical switches.
Cite
@article{arxiv.2312.11814,
title = {Study on electromagnetically induced transparency effects in Dirac and VO$_2$ hybrid material structure},
author = {Di Ke and Xie Meng and Xia Hua Rong and Cheng An Yu and Liu Yu and Du Jia Jia},
journal= {arXiv preprint arXiv:2312.11814},
year = {2023}
}