9:30 AM - 9:45 AM
[7a-A410-3] Photonic Topological Insulator Based on Si Photonic Crystal Resonator Array
Keywords:topological photonics, photonic crystal, coupled resonators
We propose a two-dimensional photonic topological insulator with coupled Si photonic crystal nanocavities, which can suppress vertical radiation loss. A crystal-type photonic topological insulating phase based on the C6 rotational symmetry is realized by a triangular lattice of hexagonal units of optimized H1 cavities. With a tight-binding analysis and a simulation with the finite element method, we show theoretically its band inversion, finite Z2 topological number, and midgap edge states between the considered topological and ordinary photonic insulators.