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Scanning probe energy loss spectroscopy (SPELS) of structured surfaces

Bauer, Karl (2015)
Ph.D. thesis, University of Birmingham.

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Abstract

In scanning probe energy loss spectroscopy (SPELS) an STM tip is used as a localised source of field emitted electrons by applying a high voltage. Energy loss measurements of the backscattered electrons provide spectroscopic information from the sample. The energy resolution is ≈0.3eV. In principle, a raster scan provides a spatially resolved image of these excitations. In this work, a new generation instrument is employed and developed in which the electrons are captured by an electrostatic lens system and focussed onto a multichannel detector using a 127° cylindrical-sector analyser. Additionally, a compact retarding field analyser has been built, which can be placed within 20mm of the tip position. Both detectors have been positioned at an angle of 7° to the surface plane, as most of the backscattered electrons are expected to emerge near the surface plane due to the high electric field between tip and sample. Ag and Au nanostructures on graphite designed for the SPELS instrument covering a large sample area have been prepared by electron beam lithography. The characteristics of the instrument have been measured, with high spatial resolution (down to 25nm) images showing various contrast mechanisms. Spatially resolved silver surface plasmon maps are presented.

Type of Work:Ph.D. thesis.
Supervisor(s):Palmer, Richard E.
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Physics and Astronomy
Subjects:QC Physics
Institution:University of Birmingham
ID Code:6103
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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