Dresden 2014 – scientific programme
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O: Fachverband Oberflächenphysik
O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures
O 37.5: Poster
Tuesday, April 1, 2014, 18:30–22:00, P2
Advantages of a quantum cascade laser for surface enhanced infrared spectroscopy — •Anton Hasenkampf, Niels Kröger, Annemarie Pucci, and Wolfgang Petrich — Universität Heidelberg, Kirchhoff-Institut für Physik, INF 227, 69120 Heidelberg
The main tool for surface-enhanced infrared spectroscopy (SEIRS) is the Fourier transform infrared (FTIR) spectrometer with a globar source. It allows spectroscopy of a sample over a broad spectral range, which in our case covers 1 µ m to 20 µ m. The disadvantage of this system is very low spectral power density of the globar. This usually is compensated by long measurement times. In this work, we present measurements with an external cavity quantum cascade laser (QCL) with grating in Littrow configuration which is integrated into a scanning microscopy setup. The QCL enables spectral measurements in the range of 1140 to 1430 cm−1. The 108 times higher spectral power density as compared to a globar reduces measurement time drastically. Also the detection with a deuterated triglycine sulfate (DTGS) instead of a nitrogen cooled mercury cadmium telluride (MCT) is possible. The tuning range of the QCL of 290 cm−1 nicely matches the requirements of SEIRS since, for nanoantennas, the enhancement occurs over a limited spectral range of the same order.