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Proceedings Paper

New planar waveguide attenuated total reflectance techniques for organic thin film spectroscopy and chemical sensing
Author(s): Darren R. Dunphy; Sergio Brito Mendes; Lifeng Li; James J. Burke; John E. Lee; Neal R. Armstrong; S. Scott Saavedra
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Paper Abstract

The planar integrated optical waveguide (IOW) is an inherently sensitive geometry for attenuated total reflection (ATR) spectroscopy of interfacial samples. A major disadvantage that has limited its wider use is the difficulty of measuring broadband spectra. Due to the quantized nature of light propagation in a planar IOW, conventional grating and prism couplers are efficient only over a narrow (less than 5 nm) spectral range at a given launch angle. We have developed a multichannel spectrometer capable of measuring a broadband visible ATR spectrum at the surface of a single mode, planar waveguide. The bandwidth is greater than 150 nm, which makes it possible to measure spectra of very weakly absorbing molecular films. We have also developed an electrochemically- active, planar IOW (EA-IOW) that combines the information content of spectroelectrochemistry with the sensitivity of the single mode planar waveguide geometry. An evaluation of this device has demonstrated that highly sensitive spectroelectrochemistry of surface confined films can be performed; the estimated pathlength enhancement is ca. 4,000 relative to a transmission geometry.

Paper Details

Date Published: 3 May 1999
PDF: 9 pages
Proc. SPIE 3602, Advances in Fluorescence Sensing Technology IV, (3 May 1999); doi: 10.1117/12.347515
Show Author Affiliations
Darren R. Dunphy, Univ. of Arizona (United States)
Sergio Brito Mendes, Optical Sciences Ctr./Univ. of Arizona (United States)
Lifeng Li, Optical Sciences Ctr./Univ. of Arizona (United States)
James J. Burke, Optical Sciences Ctr./Univ. of Arizona (United States)
John E. Lee, Univ. of Arizona (United States)
Neal R. Armstrong, Optical Sciences Ctr./Univ. of Arizona and Univ. of Arizona (United States)
S. Scott Saavedra, Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 3602:
Advances in Fluorescence Sensing Technology IV
Joseph R. Lakowicz; Steven A. Soper; Richard B. Thompson, Editor(s)

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