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Topologically enabled ultrahigh-Q chiroptical resonances by merging bound states in the continuum

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Abstract

Ultrahigh-Q chiroptical resonance metasurfaces based on merging bound states in the continuum (BICs) are investigated and numerically demonstrated. The destruction of C2 symmetry results in the leakage of BICs into quasi-BICs, and a chiral quasi-BIC is obtained by oblique incidence or continuous destruction of the mirror symmetry of the structure. Due to the significant topological properties of merging BICs, the Q factor (over 2 × 105) of the chiral resonance peak obtained is much higher than that of the previous work. Moreover, the proposed structure is easy to fabricate because no additional out-of-plane asymmetry is introduced. The proposed scheme is of importance in chiral biosensing applications.

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Corrections

6 July 2022: A typographical correction was made to the title.


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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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