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本文设计了由四聚长方体组成的全介质超表面，其中每个长方体刻蚀两个椭圆柱并填装空气。当分别为超表面单独引入面内对称破缺、位移扰动和周期扰动时，可在近红外波段产生稳健的准连续域束缚态模式(quasi-bound states in the continuum）。通过测量准BIC（ quasi-BIC）模式的谐振波长，计算准BIC模式的Q因子(quality factor)与不对称参数的关系，可进一步证实不对称参数对准BIC共振频率和Q因子的可调谐性。在此基础上，当同时引入面内对称破缺、位移扰动和周期扰动时，可获得五个高Q因子的准BIC模式。共振峰的数量、位置以及Q因子都可通过调整面内破缺、位移扰动和周期扰动的程度进行调控。该超表面的设计可为传感器的多参数传感以及灵敏度等性能的提升提供一种全新思路。High-quality factor (high-Q) resonance has broad prospects in applications such as narrow-band filtering, slow-light devices, and nonlinear optics interaction enhancement to highly sensitive sensing. The previous design methods for high-Q resonance suffered from intrinsic drawbacks such as high-volume cavities or large-scale bending radii. However, recently, a new approach to designing high-Q resonances starts to attract the public’s attention on a basis of asymmetric metasurfaces that are related to the bound states in the continuum (BIC) phenomenon. Constructing BIC resonances in electromagnetic metasurfaces can generate sharp resonant transmission peaks. Therefore, there is growing interest in utilizing BIC to achieve metasurfaces with high-Q. However, most existing studies are based on single BIC with few studies focusing on multiband BICs and multiple forms of symmetry breaking. In this work, we propose an all-dielectric metasurface composed of tetrameric cuboids. By etching two elliptical cylinders in each cuboid, the metasurface can simultaneously support in-plane symmetry breaking, displacement perturbations and periodic perturbations. We first use multipole calculations to analyze the physical mechanism by which metasurface generate quasi-BIC under these three conditions. It is confirmed that by adjusting the asymmetry parameters, the Q factor and resonant peak position of quasi-BICs can be controlled. Subsequently, we introduce the in-plane symmetry breaking, displacement perturbations and periodic perturbations to the metasurface simultaneously and generate five quasi-BIC modes, whose number and position can be flexibly adjusted, and the largest Q factor is 58039. In summary, this work provides a new practical design concept for high-Q all-dielectric metasurfaces, which can be applied to improve the sensitivity of multi-parameter sensors.
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Keywords:
- metasurface /
- quasi-bound states in the continuum /
- symmetry breaking
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