Study on electromagnetically induced transparency effects in Dirac and VO2 hybrid material structure*
arxiv(2023)
摘要
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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