Isotropic photonic band gap in 2-D photonic microcavity with Penrose quasicrystal pattern

Photonic microcavity promises to be one of the photonic devices that can have immediate applications such as superbright LED and low threshold laser. Most photonic crystal structures currently used on microcavity are cubic or hexagonal, whose folding symmetry is no greater than 6. In this work, we fabricated 2-D photonic microcavity with Penrose quasicrystal pattern and measured the angular resolved transmission and photoluminescence spectra of the microcavity. From the experimental result it is found that isotropic photonic band gap exists in the photonic microcavity with the Penrose quasicrystal pattern.