[Zurück]

G. Ramer, M. Brandstetter, J. Kasberger, A. Saeed, B. Lendl:
"Highly Sensitive Waveguide Sensor Facilitated By A Broadly Tunable Quantum Cascade Laser";
Poster: Transducers´13 & Eurosensors XXVII, Barcelona; 16.06.2013 - 20.06.2013; in: "Transducers´13 & Eurosensors XXVII", (2013), ISBN: 978-1-4673-5981-8; Paper-Nr. M3P.064, 4 S.

We present a mid-infrared spectroscopic sensor based
on a planar waveguide for highly sensitive and label-free
chemical measurements in liquids, solids and paste-like
materials.
Our sensor design uses integrated grating couplers for
stable coupling of intense mid-infrared radiation provided
by an external cavity-quantum cascade laser to achieve
extended interaction pathlengths and thus high
sensitivities. In this work the sensor´s design and
fabrication are outlined. Additionally, measurements for
the characterization of the laser are shown. A first sample
measurement was performed to demonstrate the
sensitivity of the sensor in comparison with attenuated
total reflection FTIR spectroscopy.