Mid-Infrared Spectroscopy Platform Based on GaAs/AlGaAs Thin-Film Waveguides and Quantum Cascade Lasers
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- 作者：Markus Sieger ; Julian Haas ; Michael Jetter ; Peter Michler ; Matthias Godejohann ; Boris Mizaikoff
- 刊名：Analytical Chemistry
- 出版年：2016
- 出版时间：March 1, 2016
- 年：2016
- 卷：88
- 期：5
- 页码：2558-2562
- 全文大小：272K
- ISSN：1520-6882
文摘
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.