Over 30-fold enhancement of light extraction from free-standing photonic crystal slabs with InGaAs quantum dots at low temperature

Highly efficient extraction of photoluminescence is observed from two-dimen sional photonic crystal slabs employing InGaAs quantum dots as active mater ial. The introduction of quantum dots reduces diffusion of carriers and the reby suppresses the surface recombination at the air-hole sidewalls of the photonic crystal. Around the normalized frequency of 0.7, over thirty-fold enhancement of the photoluminescence extraction is achieved at 78 K, indica ting strong coupling to leaky modes of the free-standing photonic crystal s lab. In addition, when the photoluminescence spectra overlaps with a photon ic band gap, enhanced light extraction originating from the photonic band g ap is observed experimentally. (C) 2001 American Institute of Physics.