𝔖 Bobbio Scriptorium
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Scanning Near-field Optical Microscope Designed for Operation in Liquids

✍ Scribed by Mertesdorf, M.; Sch�nhoff, M.; Lohr, F.; Kirstein, S.

Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
348 KB
Volume
25
Category
Article
ISSN
0142-2421

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✦ Synopsis

We report on the construction of a scanning near-Ðeld optical microscope (SNOM), which has been designed to permit imaging at the solid/liquid interface. The probe consists of a tapered Ðbre tip and the so called lateral shear force is used for the tip-sample distance regulation. The liquid environment causes damping of the tip vibration and lowering of the resonance frequency by approx. 20% which can not be explained by the model of a harmonic oscillator. We demonstrate the optical and topographical resolution of the instrument utilizing test grids for atomic force microscopy. First results of in-situ observation of adsorption of human serum albumin proteins at a thin Ðlm of polystyrene from aqueous bu †er solution are presented.

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