Study on electromagnetically induced transparency effects in Dirac and VO\(_2\) hybrid material structure

• Published in: arXiv.org
• Main Authors: Ke, Di, Xie Meng, Xia Hua Rong, Cheng An Yu, Liu, Yu, Du Jia Jia
• Format: Paper
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 19.12.2023
• Subjects: Insulation; Metamaterials; Optical properties; Phase transitions; Refractivity; Resonant frequencies; Terahertz frequencies; Time domain analysis; Vanadium dioxide

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.