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Opt Express. 2009 Aug 31;17(18):15975-82. doi: 10.1364/OE.17.015975.

Photonic crystal nanocavity laser with a single quantum dot gain.

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  • 1Institute for Nano Quantum Information Electronics, Institute of Industrial Science, The University of Tokyo, Tokyo 153-8505, Japan.


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 10(8) 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 using the single quantum dot gain.

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