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arXiv · 2312.11814

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

Di Ke·Xie Meng·Xia Hua Rong·Cheng An Yu·Liu Yu·Du Jia Jia
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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$_2$ 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.

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Di Ke, Xie Meng, Xia Hua Rong, Cheng An Yu, Liu Yu, Du Jia Jia. 2023-12-19. Study on electromagnetically induced transparency effects in Dirac and VO$_2$ hybrid material structure. https://arxiv.org/abs/2312.11814

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