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Control Strategies in Atomic Force Microscopy

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Abstract:
Atomic force microscopes provide unprecedented access to surfaces at the nanometer level both for imaging and for local surface modifications. Precise positioning, accurate control of interaction forces, and speed are critical issues when operating these instruments. Modern model-based control strategies lead to higher permissible imaging speeds, improved control over the interaction forces, and better tracking of surface features compared with conventional proportional-integral-controlled atomic force microscopes. In particular, H- and l1-optimal methods are applied to control both lateral scanning motions and vertical positioning.

Type of Seminar:
Public Seminar
Speaker:
Prof. Andreas Stemmer
Nanotechnology Group, ETH Zurich
Date/Time:
Apr 26, 2006   17:15
Location:

ETH Zentrum, Gloriastr. 35, Zurich, Building ETZ, Room E6
Contact Person:

Prof. M. Morari
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Biographical Sketch:
Andreas Stemmer is Professor of Nanotechnology at ETH Zurich, where in 1995 he founded the Nanotechnology Group. Born 1962 in Basel, Switzerland, he studied at the University of Basel where he obtained his diploma in Physics in 1986. He continued his studies in molecular biology at the M.E. Müller Institute of the Biocenter at the University of Basel and received certification from the Swiss Commission for Molecular Biology (SKMB). In 1990 he earned his doctorate in biophysics working on biological scanning tunneling microscopy. After conducting research as visiting scientist (1990-92) at the Medical Research Council Laboratory of Molecular Biology in Cambridge, UK, he was assistant scientist (1992-95) at the Marine Biological Laboratory in Woods Hole, MA, USA. He was elected to the Faculty of Mechanical and Process Engineering at ETH Zurich in 1995 and was promoted to full professor in 2004. His research focuses on the development of novel tools and processes to create a link as direct as possible between the macro- and the nano-world. His Nanotechnology Group is particularly active in the fields of imaging tools and techniques to expand the limits of scanning probe and light microscopy, and in natural nanofabrication to pattern and assemble nanostructures outside of cleanrooms. Most recently he started a research vector in biological engineering aimed at harvesting electrical energy from living human cells and tissue.