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Short range interaction in tunneling near-field optical microscopy

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2 Author(s)
Flaxer, E. ; School of Chemistry, The Sackler Faculty of Exact Sciences, Tel-Aviv University, 69978 Tel-Aviv, Israel ; Palachi, E.

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We use a modulation technique to detect a short-range interaction between a probe and a sample of a tunneling near-field optical microscope. This interaction might explain the resolution enhancement of the apertureless near-field techniques compared with conventional aperture near-field ones. To detect this interaction we measure approach curves of the modulating probe towards the sample and fit the experimental data with a simulation of the intensity, where a coupled dipoles interaction is added to the conventional near-field interaction. While the effect of the coupled dipoles interaction is negligible in conventional near-field microscopes, it dominates the modulated signal at scanning distances. Thus better resolution can be achieved, even in an aperture near-field microscope, by vibrating the tip vertically over the sample.

Published in:

Journal of Applied Physics  (Volume:97 ,  Issue: 2 )