Geometry symmetry-free and higher-order optical bound states in the continuum

Qingjia Zhou, Yangyang Fu (), Lujun Huang, Qiannan Wu, Andrey Miroshnichenko, Lei Gao () and Yadong Xu ()
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Qingjia Zhou: Soochow University
Yangyang Fu: Nanjing University of Aeronautics and Astronautics & Key Laboratory of Aerospace Information Materials and Physics (NUAA), MIIT
Lujun Huang: University of New South Wales
Qiannan Wu: North University of China
Andrey Miroshnichenko: University of New South Wales
Lei Gao: Soochow University
Yadong Xu: Soochow University

Nature Communications, 2021, vol. 12, issue 1, 1-9

Abstract: Abstract Geometrical symmetry plays a significant role in implementing robust, symmetry-protected, bound states in the continuum (BICs). However, this benefit is only theoretical in many cases since fabricated samples’ unavoidable imperfections may easily break the stringent geometrical requirements. Here we propose an approach by introducing the concept of geometrical-symmetry-free but symmetry-protected BICs, realized using the static-like environment induced by a zero-index metamaterial (ZIM). We find that robust BICs exist and are protected from the disordered distribution of multiple objects inside the ZIM host by its physical symmetries rather than geometrical ones. The geometric-symmetry-free BICs are robust, regardless of the objects’ external shapes and material parameters in the ZIM host. We further show theoretically and numerically that the existence of those higher-order BICs depends only on the number of objects. By practically designing a structural ZIM waveguide, the existence of BICs is numerically confirmed, as well as their independence on the presence of geometrical symmetry. Our findings provide a way of realizing higher-order BICs and link their properties to the disorder of photonic systems.

Date: 2021
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DOI: 10.1038/s41467-021-24686-5

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