Enhancement of Cavity-$Q$ in a Quasi-Three-Dimensional Photonic Crystal

概要

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We propose and design a novel microcavity structure constructed in a quasi-three-dimensional (quasi-3D) photonic crystal (PhC), which is composed of a 2D PhC and a 1D distributed Bragg reflector (DBR). The quality factor ($Q$-factor) in the vertical direction of more than 30,000 and the Purcell factor up to 1,740 are numerically demonstrated. This Purcell factor is 250 times larger than that in the conventional air-bridged PhC slab cavity. Momentum space analysis indicates that this enhancement results from the strong optical confinement by DBRs in the vertical direction. It is expected that in a quasi-3D PhC a defect mode can be designed to extract light toward the vertical direction with a simple radiation pattern while maintaining a high $Q$-factor and a small mode volume. Therefore, the proposed structure is promising for high-efficiency surface-emitting light sources including single-photon emitters.
Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physicsの論文
2004-04-15