Dresden 2009 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 40: POSTERS Electronic and Optical Properties

CPP 40.6: Poster

Donnerstag, 26. März 2009, 17:00–19:30, P3

Chemical etching of the tips for SNOM-Raman Microscope — •Daria Kovalenko, Martin Küttner, and Jörg Opitz — Fraunhofer Institut IZFP Dresden Deutschland

In this paper we will present our results concerning tip preparation for an instrument combining the SNOM and the Raman techniques of probe analysis. Like in SNOM and other kinds of optical microscopy, the resolution depends on the shape and properties of the tip. There are different ways of the tip preparation. In our case the etching is used. The tip etching was held in a two-layer solution: the lower layer consisted of 40 % hydrofluoric acid (HF), the upper layer was an organic solvent, such as toluol or cyclohexane. The time and the temperature of etching were varied. The dependences between the tip shape and the parameters of the etching were carried out. The optimal time of etching the fiber ranges from 90 to 120 min. The temperature of the etching depends strongly on the physical properties of the solvent. Typically a temperature of abut 15-25 oC is used. For higher temperatures of the etching solution a faster etching is observed. The density of the solvent influences the lubricity of the surface and also the tip angle. The best results (tip angle equals 90o) are able to obtain in the solvent with density of about 0,90 * 1,05 g/cm3.