Journal
ANALYTICAL CHEMISTRY
Volume 88, Issue 5, Pages 2558-2562Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.5b04144
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Funding
- European Union [314018]
- Kompetenznetz Funktionelle Nanostrukturen Baden Wuerttemberg, Germany
- Center for Integrated Quantum Science and Technology (IQST), University of Ulm
- University of Stuttgart, Germany
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The performance and versatility of GaAs/AlGaAs thin-film waveguide technology in combination with quantum cascade lasers for mid-infrared spectroscopy in comparison to conventional FTIR spectroscopy is presented. Infrared radiation is provided by a quantum cascade laser (QCL) spectrometer comprising four tunable QCLs providing a wavelength range of 5-11 mu m (1925-885 cm(-1)) within a single collimated beam. Epitaxially grown GaAs slab waveguides serve as optical transducer for tailored evanescent field absorption analysis. A modular waveguide mounting accessory specifically designed for on-chip thin-film GaAs waveguides is presented serving as a flexible analytical platform in lieu of conventional attenuated total reflection (ATR) crystals uniquely facilitating macroscopic handling and alignment of such microscopic waveguide structures in real-world application scenarios.
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