Affiliation:
1. CAS Key Laboratory of Human‐Machine Intelligence‐Synergy Systems Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences 518055 Shenzhen China
2. College of Physics and Electronic Information Anhui Normal University Wuhu 241000 China
3. Tianjin H‐Chip Technology Group Corporation Tianjin 300467 China
4. Shenzhen College of Advanced Technology University of Chinese Academy of Sciences Shenzhen 518055 China
Abstract
AbstractBound states in the continuum (BICs) have been of growing interest in photonics for their infinite quality factors and strong field localization. The last decade has witnessed great progress on the highest achievable quality factors of quasi‐BICs. However, it remains challenging to realize robust high‐Q quasi‐BICs that are tolerant to the parameter perturbation. Here, it is demonstrated that silicon metasurfaces formed by the hybridization of two lattices can support robust quasi‐BICs with the highest measured quality factor reaching 4130 and the minimum one larger than 1024, even when the relative displacement varies over the whole range of all the possible values. Taking advantage of the two in‐plane mirror‐symmetry points, for the first time, the transition between a toroidal dipole BIC and an electric quadrupole BIC, which guarantees robust ultrahigh‐Q quasi‐BICs at Γ point, is reported. The minimum quality factors of quasi‐BICs can be further improved significantly by shrinking the meta‐atom size and are immune from the intrinsic absorption loss of silicon in the visible regime. It is envisioned that this study will pave the way for achieving robust ultrahigh‐Q metasurfaces and boost their applications in lasing, nonlinear optics, and biosensing.
Funder
Science and Technology Planning Project of Shenzen Municipality
National Natural Science Foundation of China
Natural Science Foundation of Guangdong Province
Subject
Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials
Cited by
7 articles.
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