Study on electromagnetically induced transparency effects in Dirac and VO$_2$ hybrid material structure

• DOI: 10.48550/arxiv.2312.11814
• Publication Date: 2023-01-01
• Authors: Ke, Di; Meng, Xie; Rong, Xia Hua; Yu, Cheng An; Yu, Liu; Jia, Du Jia
• Keywords: FOS: Physical sciences; Physics - Applied Physics; Applied Physics (physics.app-ph); Physics - Optics; Optics (physics.optics)

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$_2$ is in the insulating state, the structure is symmetric to obtain a single-band PIT effect; When VO$_2$ 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.