Recovery of topologically robust merging bound states in the continuum in photonic structures with broken symmetry

被引:0
|
作者
Bai, Huayu [1 ]
Shevchenko, Andriy [1 ]
Kolkowski, Radoslaw [1 ]
机构
[1] Aalto Univ, Dept Appl Phys, POB 13500, FI-00076 Aalto, Finland
关键词
bound state in the continuum; merging BIC; polarization vortex; Q factor; REFRACTIVE-INDEX; 2ND-HARMONIC GENERATION; RESONANCES; VORTEX; SENSITIVITY; SILICON; LIGHT;
D O I
10.1515/nanoph-2024-0609
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Optical bound states in the continuum (BICs) provide a unique mechanism of light confinement that holds great potential for fundamental research and applications. Of particular interest are merging BICs realized in planar periodic structures by merging accidental and symmetry-protected BICs. Topological nature of merging BICs renders their Q factors exceptionally high and robust. However, the existence of accidental BICs with the radiation loss canceled in both the upward and downward directions relies on the up-down mirror symmetry of the structure. If this symmetry is broken, e.g., by a substrate, the Q factor of the mode drops down. Consequently, ultrahigh-Q merging BICs cannot be achieved in substrate-supported structures. Here, by studying the case of a one-dimensional periodic dielectric grating, we discover a simple method to fully compensate for the detrimental effect of breaking the up-down mirror symmetry. The method makes use of a thin layer of a high-refractive-index dielectric material on one side of the structure, allowing one to restore the diverging Q factor of the accidental BIC and fully recover the merged BIC. As an application example, we show that the proposed structures can be used as ultrahigh-performance optical sensors.
引用
收藏
页码:899 / 913
页数:15
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