Enhanced single-photon emission from single quantum dots in two-dimensional photonic crystal cavities

摘要

We have designed and fabricated L3-type photonic crystals with high-density quantum dots embedded in the wafer.In these photonic crystals, a quality factor of 3000 has been achieved, which greatly enhances the luminescence intensity of quantum dots when they are in resonance with cavity mode. An emission peak arisingfrom a single quantum dot was used to perform second order correlation measurements employing a Hanbury-Brown and Twiss setup. Clear anti-bunching is seen, which indicates single-photon emission. The emission lifetime is～500 ps, which is less than that found in quantum dots without a photonic crystal (～1ns).