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Actively tunable electromagnetically induced transparency in hybrid Dirac-VO2 metamaterials
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1. Department of Optoelectronic Engineering, Chongqing University of Post and Telecommunications, Chongqing 400065, China;2. Chongqing Key Laboratory of Autonomous Navigation and Microsystem, Chongqing University of Posts and Telecommunications, Chongqing 400065, China;2. Chongqing Key Laboratory of Autonomous Navigation and Microsystem, Chongqing University of Posts and Telecommunications, Chongqing 400065, China;3. Department of Automation, Chongqing University of Post and Telecommunications, Chongqing 400065, China

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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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DI Ke, XIE Meng, XIA Huarong, CHENG Anyu, LIU Yu, DU Jiajia. Actively tunable electromagnetically induced transparency in hybrid Dirac-VO2 metamaterials[J]. Optoelectronics Letters,2025,(1):13-20

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History
  • Received:November 04,2023
  • Revised:July 05,2024
  • Online: December 13,2024
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