Self-tuned quantum dot gain in photonic crystal lasers

Details Self-tuned quantum dot gain in photonic crystal lasers Self-tuned quantum dot gain in photonic crystal lasers

2005-11-21

arxiv.org/abs/cond-mat/0511494v1

Phys. Rev. Lett. 96, 127404 (2006).

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures, submitted to Phys. Rev

Scientific paper

10.1103/PhysRevLett.96.127404

We demonstrate that very few (1 to 3) quantum dots as a gain medium are sufficient to realize a photonic crystal laser based on a high-quality nanocavity. Photon correlation measurements show a transition from a thermal to a coherent light state proving that lasing action occurs at ultra-low thresholds. Observation of lasing is unexpected since the cavity mode is in general not resonant with the discrete quantum dot states and emission at those frequencies is suppressed. In this situation, the quasi-continuous quantum dot states become crucial since they provide an energy-transfer channel into the lasing mode, effectively leading to a self-tuned resonance for the gain medium.

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