Berlin 2015 – scientific programme

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O: Fachverband Oberflächenphysik

O 90: Sensing, Active Structures and other Applications

O 90.14: Talk

Thursday, March 19, 2015, 18:15–18:30, MA 144

Fast SEIRA Detection on Nanoantenna Arrays with Various Geometry on One Chip — •Anton Hasenkampf, Niels Kröger, Arthur Schönhals, Wolfgang Petrich, and Annemarie Pucci — Universität of Heidelberg, Kirchhoff-Institut für Physik, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany

The main tool for surface-enhanced infrared absorption (SEIRA) spectroscopy was 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 µm to 20 µm. The disadvantage of this system is very low spectral power density of the globar. This can be partially compensated by long measurement times. In this work, we present a setup with a tunable quantum cascade laser as the light source in mid-infrared range. The 10⁸ times higher spectral power density as compared to a globar reduces measurement time drastically. The combination of the quantum cascade laser with a microbolometer array for infrared light enables to map an area 2.8 * 3.1 mm² with a spatial resolution of about 9 µm, a bandwidth from 1170 to 1300 cm⁻¹, and a spectral resolution of 2.5 cm⁻¹ within 5 minutes versus 16 hours using the conventional FTIR microscope with a comparable spatial and spectral resolution.