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Seminar organised by EMAT
Subject : 3D structure determination of amorphous objects using electron wave tomography
Speaker: C. Tang, EMAT, University of Antwerp
Abstract:
At present it is possible to retrieve the electron wave in a plane of projection of an object. The basic idea of wave tomography is to backpropagate this electron wave through the object. By repeating this over several projection angles the usual “filtered backprojection algorithm” can be replaced by a “filtered backpropagation algorithm”.
It is the ultimate goal of the project to apply these ideas to reconstruct the 3D structure of an amorphous object. In the first phase of this project we analysed the possibility to use a single graphene sheet as support of a small object such as a nanoparticle. Therefore we started from simulations in which a single atom was positioned on top of a graphene sheet and we tried to reconstruct the position of the atom from the knowledge of the exit wave. In a sense the graphene support was “peeled off”. Next, we could study the precision of this reconstruction as a function of the weight of the atom, the resolution and the noise.
When and where: Friday, March 9, 2012 at 11.30 h in room X.009, Campus Groenenborger
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