Berlin 2008 – scientific programme
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O: Fachverband Oberflächenphysik
O 43: Poster Session II - MA 141/144 (Surface Spectroscopy on Kondo Systems; Frontiers of Surface Sensitive Electron Microscopy; Methods: Scanning Probe Techniques+Electronic Structure Theory+Other; Time-Resolved Spectroscopy of Surface Dynamics with EUV and XUV Radiation; joined by SYNF posters)
O 43.27: Poster
Tuesday, February 26, 2008, 18:30–19:30, Poster F
Construction of a Fibre-Tip SNOM for Investigation of Soft Organic Materials — •Philipp Lange2, Omar Al-Khatib1, Dörthe M. Eisele1, Mario Dähne2, Jürgen P. Rabe1, and Stefan Kirstein1 — 1HU-Berlin, Institut für Physik, Newtonstr. 15, 12489 Berlin — 2TU Berlin, Institut für Physik, Hardenbergstr. 36, 10623 Berlin
The setup of a fibre-tip scanning near field optical microscope (SNOM) is presented that was specially designed for the investigation of soft organic materials in air providing low tip-sample interaction, low thermal drift, and high topographic resolution. For topographic scanning the shear force of a fibre probe is detected. For this a tapered glass fibre probe is mounted on a tuning fork piezo which is forced to oscillate above the resonance frequency. The phase shift induced by the tuning fork is taken as a sensitive signal for damping of the tip oscillation due to tip-sample interaction and used for distance control. A dye laser is coupled into the fibre for near field optical excitation of the sample. The scanning unit is mounted on top of an inverted fluorescence microscope that allows comfortable adjustment and micro-positioning of tip and sample, preselection of scan areas of prior interest, and very efficient far-field detection of the luminescence. First images of fluorescent nano-particles and dye aggregates on solid surface are presented.