期刊
APPLIED PHYSICS LETTERS
卷 101, 期 2, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4733726
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资金
- DFG [Re2974/2-1, Wi1986/3-1]
- State of Bavaria
We experimentally demonstrate directional far field emission from whispering gallery modes (WGMs) in electrically driven quantum dot micropillar lasers. In-plane directionality of whispering gallery mode emission is obtained by patterning micropillars with Limacon-shaped cross-section and an upper air-bridge contact for current injection. The micropillar lasers with radii R-0 down to 4.5 mu m show Q-factors of 40 000 and threshold currents of 40 mu A at low temperature. We achieved a far field divergence of about 30 degrees and a directionality of 1.67 +/- 0.15 for an optimal Limacon deformation factor epsilon approximate to 0.5. Parameter dependent studies of the directional emission as a function of epsilon reveal good qualitative agreement with theoretical predictions. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4733726]
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