Dirac bound states in the continuum in honeycomb photonic crystal slabs.

ABSTRACT: We investigate bound states in the continuum (BICs) in dielectric photonic crystal slabs, which occur at the double Dirac point with four-fold degeneracy. The underlying structure consists of a hexagonal cluster of equilateral triangular holes with [Formula: see text] symmetry in the unit cell of a honeycomb lattice. The lowest four TE bands intersect at the center of Brillouin zone, exhibiting linear dispersions to form double Dirac cones when the ratio of cluster radius R (the distance from unit cell center to the centroid of each hole) to lattice constant a satisfies the 'degenerate' condition, where the honeycomb lattice can also be described as a triangular lattice due to symmetry-enforced geometric self-duality. In particular, two resonant states at the double Dirac point are identif

SUBMITTER: Chern RL 

PROVIDER: S-EPMC12909860 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature