title: Mid-Infrared Spectroscopy Platform Based on GaAs/AlGaAs Thin-Film Waveguides and Quantum Cascade Lasers.
abstract: 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 μm (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.
authors: Institute of Analytical and Bioanalytical Chemistry, Ulm University , Albert-Einstein-Allee 11, 89081 Ulm, Germany.
authors: Markus
authors: M
authors: Sieger
authors: Institute of Analytical and Bioanalytical Chemistry, Ulm University , Albert-Einstein-Allee 11, 89081 Ulm, Germany.
authors: Julian
authors: J
authors: Haas
authors: Institut für Halbleiteroptik und Funktionelle Grenzflächen, Universität Stuttgart , Allmandring 3, 70565 Stuttgart, Germany.
authors: Michael
authors: M
authors: Jetter
authors: Institut für Halbleiteroptik und Funktionelle Grenzflächen, Universität Stuttgart , Allmandring 3, 70565 Stuttgart, Germany.
authors: Peter
authors: P
authors: Michler
authors: MG Optical Solutions GmbH, Industriestr. 23, 86919 Utting/Ammersee, Germany.
authors: Matthias
authors: M
authors: Godejohann
authors: Institute of Analytical and Bioanalytical Chemistry, Ulm University , Albert-Einstein-Allee 11, 89081 Ulm, Germany.
authors: Boris
authors: B
authors: Mizaikoff