We demonstrate a photonic crystal nanocavity laser essentially driven by a self-assembled InAs/GaAs single quantum dot gain. The investigated nanocavities contain only 0.4 quantum dots on an average; an ultra-low density quantum dot sample (1.5 x 108 cm-2) is used so that a single quantum dot can be isolated from the surrounding quantum dots. Laser oscillation begins at a pump power of 42 nW under resonant condition, while the far-detuning conditions require ~145 nW for lasing. This spectral detuning dependence of laser threshold indicates substantial contribution of the single quantum dot to the total gain. Moreover, photon correlation measurements show a distinct transition from anti-bunching to Poissonian via bunching with the increase of the excitation power, which is also an evidence of laser oscillation with the single quantum dot.
@article{arxiv.0906.4181,
title = {Photonic crystal nanocavity laser with a single quantum dot gain},
author = {Masahiro Nomura and Naoto Kumagai and Satoshi Iwamoto and Yasutomo Ota and Yasuhiko Arakawa},
journal= {arXiv preprint arXiv:0906.4181},
year = {2015}
}