Beanland, R., Sanchez, A. M., Hernandez-Garrido, J. C., Wolf, D. and Midgley, P. A.. (2010) Electron tomography of III-V quantum dots using dark field 002 imaging conditions. Journal of Microscopy, Vol.237 (No.2). pp. 148-154. ISSN 0022-2720

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Abstract

We present an evaluation of electron tomography of buried InAs quantum dots using dark field 002 imaging conditions. The compositional sensitivity of this imaging condition gives strong contrast among III-V materials of differing compositions and, in principle, should allow an accurate 3D model of the buried structures to be produced. The large extinction distance allows specimens several hundred nanometres in thickness to be examined and reduces the effect of strain contrast in the images, with the advantage that it can be performed using conventional transmission electron microscopy techniques. A two-beam condition must be maintained for all images, and the presence of other strong diffraction effects at certain specimen orientation results reduces the number of orientations available for tomography by approximately 10%. The data presented here are limited due to a lack of angular range in the data set but we find that an acceptable 3D model of a buried quantum dot may be produced by imposing cylindrical symmetry on the data set.

Item Type:	Journal Article
Subjects:	Q Science > QH Natural history
Divisions:	Faculty of Science > Physics
Journal or Publication Title:	Journal of Microscopy
Publisher:	Wiley-Blackwell Publishing, Inc
ISSN:	0022-2720
Date:	February 2010
Volume:	Vol.237
Number:	No.2
Number of Pages:	7
Page Range:	pp. 148-154
Identification Number:	10.1111/j.1365-2818.2009.03318.x
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
URI:	http://wrap.warwick.ac.uk/id/eprint/16587

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