Berlin 2012 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 35: Poster Session II (Polymeric biomolecular films; Nanostructures; Electronic structure; Spin-orbit interaction; Phase transitions; Surface chemical reactions; Heterogeneous catalysis; Particles and clusters; Surface magnetism; Electron and spin dynamics; Surface dynamics; Methods; Electronic structure theory; Functional molecules)
O 35.104: Poster
Dienstag, 27. März 2012, 18:15–21:45, Poster B
Nano-Raman Microscope with Novel Probe Design for High-Resolution Surface Investigations — •Christoph Zeh1, Daria Kovalenko1, Martin Küttner1, Bernd Köhler1, Jörg Opitz1, and Lukas M. Eng2 — 1Fraunhofer Institut für Zerstörungsfreie Prüfverfahren, Institutsteil Dresden, Maria-Reiche-Str. 2, 01109 Dresden — 2Institut für Angewandte Photophysik, TU Dresden, 01069 Dresen
Optical Raman signals contain a wealth of information about the physical and chemical properties of many different substances. In this work, we demonstrate our home-built Nano-Raman microscope (NRM) and special optical fiber probes. The NRM comprises a standard microscope as optical detection system and a scanning near-field optical (SNOM) head. It is intended for investigations of nano-structured materials for novel industrial applications. The probe acts as a nanoscale light source and locally illuminates the sample. In each examined point of the sample, light scattered from the surface is collected through the microscopes objective lens and sent to an optical detector, e.g. spectrometer. The smaller the light source is, the higher is the resolution. To achieve a small spot size and high light intensities at the same time, we use sharp optical fiber tips prepared from a special optical fiber. The fiber has a refractive index profile allowing better polarization control, especially for circular light distributions. These modes of the optical field allow for a higher efficiency of the fiber probe. We will present recent results on the fabrication of suitable fiber tips.