Abstract

Quasi-bound states in the continuum provide an effective and observable way to improve metasurface performance, usually with an ultra-high-quality factor. Dielectric metasurfaces dependent on Mie resonances have the characteristic of significantly low loss, and the polarization can be affected by the parameter tuning of the structure. Based on the theory of quasi-bound states in the continuum, we propose and simulate a bifunctional resonant metasurface, whose periodic unit structure consists of four antiparallel and symmetrical amorphous silicon columns embedded in a poly(methyl methacrylate) layer. The metasurface can exhibit an extreme Huygens’ regime in the case of an incident plane wave with linear polarization, while exhibiting chirality in the case of incident circular polarized light. Our structure provides ideas for promoting the multifunctional development of flat optical devices, as well as presenting potential in polarization-dependent fields.

Highlights

  • As an effective tool for manipulating electromagnetic wavefronts, metasurfaces composed of periodic meta-atom arrays have shown excellent performance and great potential in many fields [1,2]

  • The former is achieved by the symmetry of the structure, while the latter is achieved by destructive interference [21], such as Fabry–Pérot BICs [22,23] or Friedrich–Wintgen BICs [24,25]

  • We propose a bifunctional dielectric metasurface based on Q-BICs, which is composed of amorphous silicon columns embedded in a poly(methyl methacrylate)

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Summary

A Bifunctional Silicon Dielectric Metasurface Based on

Jianan Wang 1 , Weici Liu 2 , Zhongchao Wei 1 , Hongyun Meng 1 , Hongzhan Liu 1 , Jianping Guo 1 , Manxing Yang 1 , Yongkang Song 1 , Liujing Xiang 1 , Zhenming Huang 1 , Haoxian Li 1 and Faqiang Wang 1, *. Materials and Devices, School of Information and Optoelectronic Science and Engineering, South China

Introduction
Model and Methods
Extreme Huygens’
Chiral Metasurface Based on Q-BIC
Conclusions

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