The Theory of SNOM: A Novel Approach

Details The Theory of SNOM: A Novel Approach The Theory of SNOM: A Novel Approach

1997-07-02

arxiv.org/abs/cond-mat/9707025v1

Physics

Condensed Matter

19 pages, 11 figures. To be published in the Journal of Modern Optics

Scientific paper

In this paper we consider the application of electromagnetic theory to the analysis of the Scanning Near-field Optical Microscope (SNOM) in order to predict experimentally observable quantities such as the transmission or reflection coefficients for a particular tip-surface configuration. In particular we present the first application of a transfer matrix based calculation to this challenging problem by using an adaptive co-ordinate transformation to accurately model the shape of the SNOM tip. We also investigate the possibility of increasing the transmitted light through the SNOM tip by introducing a metal wire into the centre of the tip. This converts the tip into a co-axial cable. We show that, in principle, this can dramatically improve the transmission characteristics without having a detrimental effect on the resolution.

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