Merging bound states in the continuum by harnessing higher-order topological charges

Meng Kang; Li Mao; Shunping Zhang; Meng Xiao; Hongxing Xu; Che Ting Chan

doi:10.1038/s41377-022-00923-4

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Merging bound states in the continuum by harnessing higher-order topological charges

Original Articles

- Merging bound states in the continuum by harnessing higher-order topological charges
- Light: Science & Applications Vol. 11, Issue 9, Pages: 2098-2106(2022)
- Affiliations：
  
  1.School of Physics and Technology, and Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education, Wuhan University, Wuhan, 430072, China
  2.Department of Physics, The Hong Kong University of Science and Technology, Hong Kong, China
  3.Wuhan Institute of Quantum Technology, Wuhan, 430206, China
  4.School of Microelectronics, Wuhan University, Wuhan, 430072, China
- Author bio：
  
  Meng Xiao (phmxiao@whu.edu.cn)
  Ting Chan (phchan@ust.hk)
- Funds：
- DOI：10.1038/s41377-022-00923-4
  CLC：
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Kang, M. et al. Merging bound states in the continuum by harnessing higher-order topological charges. Light: Science & Applications, 11, 2098-2106 (2022).
DOI：

Kang, M. et al. Merging bound states in the continuum by harnessing higher-order topological charges. Light: Science & Applications, 11, 2098-2106 (2022). DOI： 10.1038/s41377-022-00923-4.

摘要

Abstract

Bound states in the continuum (BICs) can confine light with a theoretically infinite Q factor. However, in practical on-chip resonators, scattering loss caused by inevitable fabrication imperfection leads to finite Q factors due to the coupling of BICs with nearby radiative states. Merging multiple BICs can improve the robustness of BICs against fabrication imperfection by improving the Q factors of nearby states over a broad wavevector range. To date, the studies of merging BICs have been limited to fundamental BICs with topological charges ±1. Here we show the unique advantages of higher-order BICs (those with higher-order topological charges) in constructing merging BICs. Merging multiple BICs with a higher-order BIC can further improve the Q factors compared with those involving only fundamental BICs. In addition, higher-order BICs offer great flexibility in realizing steerable off-Γ merging BICs. A higher-order BIC at Γ can split into a few off-Γ fundamental BICs by reducing the system symmetry. The split BICs can then be tuned to merge with another BIC,e.g,., an accidental BIC, at an off-Γ point. When the in-plane mirror symmetry is further broken, merging BICs become steerable in the reciprocal space. Merging BICs provide a paradigm to achieve robust ultrahigh-Q resonances, which are important in enhancing nonlinear and quantum effects and improving the performance of optoelectronic devices.

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references

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