Bifunctional sensing based on an exceptional point with bilayer metasurfaces

Exceptional points (EPs), the critical phase transition points of non-Hermitian parity-time (PT) systems, exhibit many novel physical properties and associated applications, such as ultra-sensitive detection of perturbations. Here, a bilayer metasurface with two orthogonally oriented split-ring reso...

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Bibliographic Details
Published in:Optics express 2023-01, Vol.31 (1), p.492-501
Main Authors: Li, Yicheng, Deng, Zhengwei, Qin, Chunhua, Wan, Shicheng, Lv, Bo, Guan, Chunying, Yang, Jun, Zhang, Shuang, Shi, Jinhui
Format: Article
Language:English
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Summary:Exceptional points (EPs), the critical phase transition points of non-Hermitian parity-time (PT) systems, exhibit many novel physical properties and associated applications, such as ultra-sensitive detection of perturbations. Here, a bilayer metasurface with two orthogonally oriented split-ring resonators (SRRs) is proposed and a phase transition of the eigenpolarization states is introduced via changing the conductivity of vanadium dioxide (VO ) patch integrated into the gap of one SRR. The metasurface possesses a passive PT symmetry and an EP in polarization space is observed at a certain conductivity of the VO . Two sensing schemes with the metasurface are proposed to achieve high-sensitivity sensing of temperature and refractive index in the terahertz (THz) range. The metasurface is promising for applications in THz biosensing and polarization manipulation.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.478546