Berlin 2005 – scientific programme

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Q: Quantenoptik und Photonik

Q 39: Nichtlineare optische Effekte & Lichtquellen

Q 39.4: Talk

Tuesday, March 8, 2005, 11:30–11:45, HU 2014a

Nanostructures observation with Near-field microscop in the finger print region (1500-4000 cm-1) — •Jean-Sébastien Samson, Andreas Bergner, Götz Wollny, Erik Brundermann, and Martina Havenith — Ruhr-Universität-Bochum, Physikalische Chemie 2,NC 2/72, 44780 Bochum

In contrast to optical techniques the middle infrared which is able to characterize different functional groups by their chemical fingerprint allows label free detection. the laser source we use is a high power optical parametric oscillator (OPO) made with a periodically polled Lithium Niobate crystal. This laser source is tunable between 1500 and 4000 cm-1 and is stable in wavelength and intensity. We use the cantilever of an AFM as a nanoemitter. first measurements were performed on a gallium implanted nanostructure that prooved that we are able to scan the chemical composition of a absolutly flat surface. The lateral resolution is 30 nm which correspond to lambda/100 and is far below the Rayleigh limit. this Set-up is very attractive for observation of surface plasmon in the infrared and imaging of functional group in living cells.