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

作者：Butler I M E^*; Li W; Sobhani S A; Babazadeh N; Ross I M; Nishi K; Takemasa K; Sugawara M; Childs D T D; Hogg R A

来源：Applied Physics Letters, 2018, 113(1): 012105.

DOI：10.1063/1.5021774

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 microstructure 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. Published by AIP Publishing.

• 出版日期2018-7-2