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

I. M.E. Butler, W. Li, S. A. Sobhani, N. Babazadeh, I. M. Ross, K. Nishi, K. Takemasa, M. Sugawara, D. T.D. Childs, R. A. Hogg

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We describe a high angle annular dark field scanning transmission electron microscopy study of a 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, and 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 the micro-structure and optical properties allows 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.

Original languageEnglish
Article number012105
JournalApplied Physics Letters
Issue number1
Publication statusPublished - 05 Jul 2018

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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