Merging of Accidental Bound States in the Continuum in Symmetry and Symmetry-Broken Terahertz Photonic Crystal Slabs.

ABSTRACT: Recently, the merging of accidental bound states in the continuum (BICs) has attracted significant attention due to the enhanced light-matter interactions. Here, we theoretically demonstrate the merging of accidental BICs in perturbed all-silicon terahertz photonic crystal (PhC) slabs with C₂ and C₂ broken-symmetry structures. The PhC slabs consist of an array of four cylindrical holes and support a TM symmetry protected (SP) vector BIC at the Γ point. Our results indicate that the merging and band transition of accidental BICs can be achieved by varying the diameter of diagonal holes in a C₂-symmetry structure. Notably, in a C₂ broken-symmetry PhC slab, the SP BIC will first convert to a quasi-BIC, then transit to a n

SUBMITTER: Chen J 

PROVIDER: S-EPMC11945727 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature