Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 36: Poster Session II (Organic films and electronics, photoorganics; Nanostructures; Plasmonics and nanooptics, Surface chemical reactions and heterogeneous catalysis, Surface dynamics )

O 36.33: Poster

Dienstag, 12. März 2013, 18:15–21:45, Poster B2

Integration of a QCL in a SEIRA setup — •Anton Hasenkampf, Niels Kröger, Annemarie Annemarie Pucci, and Wolfgang Petrich — Kirchhoff-Institute for Physics Im Neuenheimer Feld 227 D-69120 Heidelberg

The main tool for surface-enhanced infrared absorption (SEIRA) for 60 years was the Fourier transform infrared (FTIR) spectrometer with a globar source. It allows spectroscopy of a sample with a spectral band width of 750 nm-100 000 nm. The disadvantage of this system is very low intensity of the used globar light source. This usually is compensated by long measurement times. In this work, we present an approach to combine a laser scanning microscopy setup with an external cavity quantum cascade laser (QCL) with grating in Littrow configuration. This enables a spectral measurement in the range of 7000 to 9000 nm. The 10^9 times higher spectral intensity compared to a globar can be used to reduce measurement time drastically and allows detection with a deuterated triglycine sulfate (DTGS). Since the spectral band width is limited, applications of the method are beyond broadband spectroscopy.