Merging BICs by manipulating higher-order topological charges (IMAGE)

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Merging BICs by manipulating higher-order topological charges

Caption

Accidental BICs can be simultaneously tuned to merge with the higher-order charged BIC at the Γ point by varying thickness. Once the symmetry is reduced, the higher-order charged BIC is broken and split into two off-Γ BICs. Subsequently, they can be tuned to form merging BICs with another accidental BIC at off-Γ points. The merging BIC is steerable with a designed momentum when in-plane mirror symmetry is further broken. Compared with isolated BICs, merging BICs can significantly enhance the Q factors of nearby radiative states.

Credit

by Meng Kang, Li Mao, Shunping Zhang, Meng Xiao, Hongxing Xu and Che Ting Chan

Usage Restrictions

Credit must be given to the creator.

License

CC BY

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