Abstract
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 using the single quantum dot gain.
Original language | English |
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Pages (from-to) | 15975-15982 |
Number of pages | 8 |
Journal | Optics Express |
Volume | 17 |
Issue number | 18 |
DOIs | |
Publication status | Published - 2009 Aug 31 |
Externally published | Yes |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics