Directional whispering gallery mode emission from Limacon-shaped electrically pumped quantum dot micropillar lasers

F. Albert; C. Hopfmann; A. Eberspaecher; F. Arnold; M. Emmerling; C. Schneider; Sven Höfling; A. Forchel; M. Kamp; J. Wiersig; S. Reitzenstein

doi:10.1063/1.4733726

Directional whispering gallery mode emission from Limacon-shaped electrically pumped quantum dot micropillar lasers

F. Albert^*, C. Hopfmann, A. Eberspaecher, F. Arnold, M. Emmerling, C. Schneider, Sven Höfling, A. Forchel, M. Kamp, J. Wiersig, S. Reitzenstein

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

Abstract

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]

Original language	English
Article number	021116
Number of pages	4
Journal	Applied Physics Letters
Volume	101
Issue number	2
DOIs	https://doi.org/10.1063/1.4733726
Publication status	Published - 9 Jul 2012

Keywords

MICROCAVITIES

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10.1063/1.4733726

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title = "Directional whispering gallery mode emission from Limacon-shaped electrically pumped quantum dot micropillar lasers",

abstract = "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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day = "9",

doi = "10.1063/1.4733726",

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volume = "101",

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TY - JOUR

T1 - Directional whispering gallery mode emission from Limacon-shaped electrically pumped quantum dot micropillar lasers

AU - Albert, F.

AU - Hopfmann, C.

AU - Eberspaecher, A.

AU - Arnold, F.

AU - Emmerling, M.

AU - Schneider, C.

AU - Höfling, Sven

AU - Forchel, A.

AU - Kamp, M.

AU - Wiersig, J.

AU - Reitzenstein, S.

PY - 2012/7/9

Y1 - 2012/7/9

N2 - 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]

AB - 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]

KW - MICROCAVITIES

U2 - 10.1063/1.4733726

DO - 10.1063/1.4733726

M3 - Article

SN - 0003-6951

VL - 101

JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 2

M1 - 021116

ER -

Directional whispering gallery mode emission from Limacon-shaped electrically pumped quantum dot micropillar lasers

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