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Photonic bound states in the continuum in asymmetric bi-slot metasurfaces
Journal
International Conference on Metamaterials, Photonic Crystals and Plasmonics
Date Issued
2023-01-01
Author(s)
Hsu, Ti Jung
Abstract
We investigate the photonic bound states in the continuum (BICs) in dielectric metasurfaces composted of two asymmetric slots in the unit cell of a square lattice. Symmetry-protected (SP) BICs occur at the polarization vortex center (V point) with integer topological charge in the polarization state diagram when the structure is fully symmetric. By introducing the asymmetry between the two slots, accidental BICs or Friedrich-Wintgen (FW) BICs can be formed from the merging of two circular polarization points (C points) with half-integer topological charge.
Type
conference paper