Fabrication and Characterization of Molecular Beam Epitaxy Grown Thin-Film GaAs Waveguides for Mid-Infrared Evanescent Field Chemical Sensing
Authors:
- 17 May 2006
- journal article
- research article
- Published by American Chemical Society (ACS) in Analytical Chemistry
- Vol. 78 (12) , 4224-4227
Abstract
Thin-film GaAs waveguides were designed and fabricated by molecular beam epitaxy for use in mid-infrared (MIR) evanescent field liquid sensing. Waveguides were designed to facilitate the propagation of a single mode at a wavelength of 10.3 μm emitted from a distributed feedback quantum cascade laser, which overlaps with molecular selective absorption features of acetic anhydride. The characterization of the waveguides shows transmission across a broad MIR band. Evanescent field absorption measurements indicate a significant sensitivity enhancement in contrast to multimode planar silver halide waveguides.Keywords
This publication has 22 references indexed in Scilit:
- Infrared Evanescent Field Sensing with Quantum Cascade Lasers and Planar Silver Halide WaveguidesAnalytical Chemistry, 2005
- Optical analysis of infrared spectra recorded with tapered chalcogenide glass fibersOptical Materials, 2004
- Direct Analysis of Oxidizing Agents in Aqueous Solution with Attenuated Total Reflectance Mid-Infrared Spectroscopy and Diamond-like Carbon Protected WaveguidesAnalytical Chemistry, 2003
- Symmetrically Tapered <30-μm-thick Quasi-Planar Germanium Waveguides as Chemical Sensors for MicroanalysisApplied Spectroscopy, 2002
- Chemical sensors based on quantum cascade lasersIEEE Journal of Quantum Electronics, 2002
- Distributed feedback quantum cascade lasersApplied Physics Letters, 1997
- Quantum Cascade LaserScience, 1994
- In situ attenuated total reflectance FT-IR analysis of an enzyme-modified mid-infrared fiber surface using crystalline bacterial surface proteinsAnalytical Chemistry, 1994
- Evanescent wave absorption spectroscopy using multimode fibersJournal of Applied Physics, 1990
- Attenuated total reflectionSpectrochimica Acta, 1961