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In this paper, we present a metamaterial structure of Dirac and vanadiumdioxide and investigate its optical properties using the finite-differencetime-domain (FDTD) technique. Using the phase transition feature of vanadiumdioxide, the design can realize active tuning of the PIT effect at terahertzfrequency, thereby converting from a single PIT to a double PIT. When VO$_2$ isin the insulating state, the structure is symmetric to obtain a single-band PITeffect; When VO$_2$ is in the metallic state, the structure turns asymmetric torealize a dual-band PIT effect. This design provides a reference direction forthe design of actively tunable metamaterials. Additionally, it is discoveredthat the transparent window's resonant frequency and the Dirac material's Fermilevel in this structure have a somewhat linear relationship. In addition, thestructure achieves superior refractive index sensitivity in the terahertz band,surpassing 1 THz/RIU. Consequently, the concept exhibits encouraging potentialfor application in refractive index sensors and optical switches.

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