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Title: Near-infrared spectroscopy with a dispersive waveguide device

Abstract

Miniature, low-cost sensors are in demand for a variety of applications in industry, medicine, and environmental sciences. As a first step in developing such a sensor, we have etched a grating into a GaAs rib waveguide to serve as a wavelength-dispersive element. The device was fabricated with the techniques of metal-organic chemical vapor deposition, electron-beam lithography, optical lithography, and reactive ion-beam etching. While full integration is the eventual goal of this work, for the present, a functional spectrometer was constructed with the addition of a discrete source, sample cell, lenses, and detector. The waveguide spectrometer has a spectral resolution of 7.5 nm and a spectral dispersion of 0.11{degree}/nm. As presently configured, it functions in the spectral range of 1500 to 1600 nm. A demonstration of the analytical capability of the waveguide spectrometer is presented. The problem posed is the determination of diethanol amine in an ethanol solution (about 10 to 100 g/L). This procedure involves the detection of the first overtone of the NH stretch at 1545 nm in a moderately absorbing solvent background. The standard error of prediction for the determination was 5.4 g/L. {copyright} {ital 1997} {ital Society for Applied Spectroscopy}

Authors:
; ; ; ; ; ;  [1]
  1. Sandia National Laboratories, Albuquerque, New Mexico 87185-1411 (United States)
Publication Date:
Research Org.:
Sandia National Laboratory
OSTI Identifier:
538388
DOE Contract Number:  
AC04-94AL85000
Resource Type:
Journal Article
Journal Name:
Applied Spectroscopy
Additional Journal Information:
Journal Volume: 51; Journal Issue: 6; Other Information: PBD: Jun 1997
Country of Publication:
United States
Language:
English
Subject:
44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; INFRARED SPECTROMETERS; PERFORMANCE; WAVEGUIDES; INFRARED RADIATION; MULTIPLEXERS; CONCENTRATION RATIO

Citation Formats

Stallard, B R, Rowe, R K, Howard, A J, Hadley, G R, Vawter, G A, Wendt, J R, and Fritz, I J. Near-infrared spectroscopy with a dispersive waveguide device. United States: N. p., 1997. Web. doi:10.1366/0003702971941179.
Stallard, B R, Rowe, R K, Howard, A J, Hadley, G R, Vawter, G A, Wendt, J R, & Fritz, I J. Near-infrared spectroscopy with a dispersive waveguide device. United States. doi:10.1366/0003702971941179.
Stallard, B R, Rowe, R K, Howard, A J, Hadley, G R, Vawter, G A, Wendt, J R, and Fritz, I J. Sun . "Near-infrared spectroscopy with a dispersive waveguide device". United States. doi:10.1366/0003702971941179.
@article{osti_538388,
title = {Near-infrared spectroscopy with a dispersive waveguide device},
author = {Stallard, B R and Rowe, R K and Howard, A J and Hadley, G R and Vawter, G A and Wendt, J R and Fritz, I J},
abstractNote = {Miniature, low-cost sensors are in demand for a variety of applications in industry, medicine, and environmental sciences. As a first step in developing such a sensor, we have etched a grating into a GaAs rib waveguide to serve as a wavelength-dispersive element. The device was fabricated with the techniques of metal-organic chemical vapor deposition, electron-beam lithography, optical lithography, and reactive ion-beam etching. While full integration is the eventual goal of this work, for the present, a functional spectrometer was constructed with the addition of a discrete source, sample cell, lenses, and detector. The waveguide spectrometer has a spectral resolution of 7.5 nm and a spectral dispersion of 0.11{degree}/nm. As presently configured, it functions in the spectral range of 1500 to 1600 nm. A demonstration of the analytical capability of the waveguide spectrometer is presented. The problem posed is the determination of diethanol amine in an ethanol solution (about 10 to 100 g/L). This procedure involves the detection of the first overtone of the NH stretch at 1545 nm in a moderately absorbing solvent background. The standard error of prediction for the determination was 5.4 g/L. {copyright} {ital 1997} {ital Society for Applied Spectroscopy}},
doi = {10.1366/0003702971941179},
journal = {Applied Spectroscopy},
number = 6,
volume = 51,
place = {United States},
year = {1997},
month = {6}
}