Actively tunable electromagnetically induced transparency in hybrid Dirac-VO2 metamaterials
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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 VO2 is in the insulating state, the structure is symmetric to obtain a single-band PIT effect; When VO2 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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This work has been supported by Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 11704053), the National Natural Science Foundation of China (Grant No. 52175531) and the Science and Technology Research Program of Chongqing Municipal Education Commission (Grant No. KJQN 201800629，KJZD-M202000602, 62375031).
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