Size Anisotropy inhomogeneity effects in state-of-the-art quantum dot lasers

Butler, I.M.E., Li, W., Sobhani, S.A., Babazadeh, N., Ross, I.M., Nishi, K., Takemasa, K., Sugawara, M., Childs, D.T.D. and Hogg, R.A. (2018) Size Anisotropy inhomogeneity effects in state-of-the-art quantum dot lasers. Applied Physics Letters, 113(1), 012105. (doi:10.1063/1.5021774)

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Abstract

We describe a high angle annular dark field scanning transmission electron microscopy (HAADF STEM) study of self-assembled InAs-GaAs quantum dot (QD) laser sample, providing insight into the micro-structure of the QD ensemble. A size distribution anisotropy of the QDs is observed in the two orthogonal (110) planes, this structural information is used to develop a density of states model for the QD ensemble which is shown to be in strong agreement with a range of optical spectroscopic measurements. This link between micro-structure and optical properties allow routes to QD device simulation. We go on to discuss how changes to the micro-structure would affect the density of states and hence laser performance.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Butler, Iain and Childs, Dr David and Hogg, Professor Richard and Babazadeh, Dr Nasser
Authors: Butler, I.M.E., Li, W., Sobhani, S.A., Babazadeh, N., Ross, I.M., Nishi, K., Takemasa, K., Sugawara, M., Childs, D.T.D., and Hogg, R.A.
College/School:College of Science and Engineering > School of Engineering
College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering
Journal Name:Applied Physics Letters
Publisher:AIP Publishing
ISSN:0003-6951
ISSN (Online):1077-3118
Published Online:05 July 2018
Copyright Holders:Copyright © 2018 The Authors
First Published:First published in Applied Physics Letters 113(1):012105
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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