Abstract
We investigate the properties of near-field reflection spectroscopy in different polarization and detection modes using uncoated fiber probes. The results show, that cross-polarized detection suppresses to a large extent far-field contributions. Using the fiber dithering as a modulation source for the optical signal, the signal background and topographical artifacts are also strongly suppressed. This technique allows for a very sensitive and essentially artifact-free near-field imaging of the susceptibility contrast. A spatial resolution better than 150 nm is achieved in near-field imaging. We show optical images corresponding to purely topographical contrast and purely optical contrast.
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