Photonic quasicrystal single-cell cavity mode

We propose and realize the photonic quasicrystal (PQC) single-cell resonator based on a InP-InGaAsP freestanding slab. A well-defined hexapole-like localized state following a C 6 ν symmetry is identified from the PQC single-cell resonator. In this type of hexapole mode, the electromagnetic energy is strongly concentrated on the dielectric region, in contrast to that in a triangular lattice photonic crystal. By tailoring the structural parameters, the hexapole mode shows a maximum theoretical quality factor of ∼ 20 000 . The PQC single-cell resonator lases in a single hexapole mode with a threshold of ∼ 0.6 mW at room temperature.