Archive > Volume Issue 1 > 2025(1):13-20. DOI:https://doi.org/10.1007/s11801-025-3239-1 CSTR: Prev Next
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 (VO2) and investigate its optical properties using the finite-difference time-domain (FDTD) technique. Using the phase transition feature of VO2, the design can realize active tuning of the plasmon induced transparency (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 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 design exhibits encouraging potential for application in refractive index sensors and optical switches.
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