A quasi-bic optical filter and a chiral control method thereof

By disrupting the annular groove symmetry of the metasurface square lattice, an optical filter supporting a quasi-BIC is formed, solving the problem of reduced circular dichroism in existing technologies. This achieves high Q-factor and high-performance chiral modulation, suitable for high-spectral-resolution chiral biosensors and low-threshold lasers.

CN119024466BActive Publication Date: 2025-11-11ANHUI UNIV
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Patent Information

Application Number
CN202410966948.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-07-18
Publication Date
2025-11-11
Estimated Expiration
2044-07-18

AI Technical Summary

Technical Problem

Existing optical filters suffer from reduced circular dichroism CD performance due to the increased asymmetry of metasurface structures and their intrinsic modes.

Method used

By disrupting the in-plane inversion structural symmetry of the annular grooves in the metasurface square lattice, an optical filter supporting quasi-BIC is formed. A C4v metasurface structure is used and numerical simulations are performed to analyze the band structure and quality factor distribution, thereby achieving the control of the quasi-BIC mode.

Benefits of technology

It improves the sensitivity and circular dichroism of optical filters, and has high Q-factor and high-performance chiral control capabilities, making it suitable for high-spectral-resolution chiral biosensors and low-threshold lasers.

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Abstract

This invention discloses a quasi-BIC optical filter and its chiral modulation method, relating to the field of optical metasurface technology. The method includes: an optical filter based on a metasurface structure, the metasurface comprising several square lattices, each square lattice having an interrupted annular groove etched on it; disrupting the in-plane inversion structural symmetry of the annular grooves in the square lattices of the metasurface to achieve a metasurface-supported quasi-BIC mode, specifically by extending one end of one of the interrupted annular grooves by a certain distance while simultaneously shortening the adjacent ends of adjacent grooves by the same distance, obtaining the transmittance at the quasi-BIC frequency point when switching the transverse magnetic wave in the x-direction of the metasurface to RCP and LCP, and chiral modulation of the circular dichroism of the metasurface based on the transmittance of RCP and LCP.
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