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ISPSeminar

(Invited talk)

Title: "Computational Imaging in Atomic Force Microscopy"

Speaker: Thomas Arildsen (TPS/DES, Aalborg U., Denmark)

Location: "Shannon" Seminar Room (a105) Place du Levant 3, Maxwell Building, 1st floor

Date / Time (duration): Thursday 30/11/2017, 11h15 (~ 45')

Abstract:

Atomic force microscopy (AFM) is an imaging technique which can measure the surface structure of a specimen of interest down to nano-scale. It does this by scanning a tiny probe across the surface and thereby measuring a “height map” or other properties of the surface.

In a recent research project at Aalborg University we attempted to speed up imaging or reduce interaction with the sample in AFM. We seek to achieve this by scanning the surface sparsely and thereby reducing the scan time and/or reducing the fraction of the surface area being affected by the probe. This naturally poses some challenges in the imaging process due to the resulting “missing data”.

In this talk I explain how we used computational techniques inspired by compressed sensing, optimisation and inverse problems to reconstruct AFM images from the otherwise insufficient measurements. I explain how we search for and optimise sampling patterns to be better suited for subsequent reconstruction of the images. I present some challenges met in the process of developing the proposed techniques from synthetic numerical experiments to real data from commercial AFM equipment and show examples of the results obtained.




Last updated November 30, 2017, at 10:16 AM