Efficient spatial redistribution of quantum dot spontaneous emission from two-dimensional photonic crystals

被引：31

作者：

Kaniber, M.

Kress, A.

Laucht, A.

Bichler, M.

Meyer, R.

Amann, M.-C.

Finley, J. J.

机构：

[1] Tech Univ Munich, Walter Schottky Inst, D-85748 Garching, Germany

[2] Tech Univ Munich, Dept Phys, D-85748 Garching, Germany

来源：

APPLIED PHYSICS LETTERS | 2007年 / 91卷 / 06期

关键词：

D O I：

10.1063/1.2757134

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The authors investigate the modification of the spontaneous emission dynamics and the external quantum efficiency for self-assembled InGaAs quantum dots coupled to extended and localized photonic states in GaAs two-dimensional photonic crystals. The photonic band gap is shown to give rise to a five to ten times enhancement of the external quantum efficiency, while the spontaneous emission rate is simultaneously reduced by a comparable factor. The findings are quantitatively explained by a modal redistribution of spontaneous emission due to the modified local density of photonic states. The results suggest that quantum dots embedded within photonic crystals are suitable for practical single photon sources with high external efficiency. (c) 2007 American Institute of Physics.

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页数：3

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