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Updated: Jul 7, 2026

Assembly, Tuning and Use of an Apertureless Near Field Infrared Microscope for Protein Imaging
Published on: November 25, 2009
Beyond lock-in analysis for volumetric imaging in apertureless scanning near-field optical microscopy
R Vogelgesang1, R Esteban, K Kern
1Max Planck Institut für Festkörperforschung, 70569 Stuttgart, Germany. r.vogelgesang@fkf.mpg.de
Abstract:
Conventional apertureless scanning near-field optical microscopy uses lock-in demodulation techniques to filter higher harmonics from the periodically modulated optical signal. On the one hand, this signal notoriously may contain contaminating mechanical contributions; on the other, it reduces the available data to one number per pixel. Realizing that the vertically oscillating near-field probe actually traverses a whole volume above the sample surface, we discuss a model to extend the data analysis in an attempt to better extract the optical information and to recover its three-dimensional spatial distribution.
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