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Proceedings Paper

New optical detection techniques for chemical sensors
Author(s): Sergio Brito Mendes; Seppo Honkanen; Mahmoud Fallahi; Nasser Peyghambarian
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Paper Abstract

In this work we present three novel optical approaches towards the implementation of bio-and chemical sensors. First we describe an absorbance spectroscopic techniques developed on a waveguide platform that features a sensitivity enhancement of 4 orders of magnitude compared to the conventional transmission measurements of ultra-thin films. Next we show a waveguide Zeeman interferometric technique, which is based on the relative phase change between the TE and TM waveguide modes, applied as a sensor platform. Finally an external-cavity laser, a semiconductor laser combined with a single mode optical fiber and a Bragg grating reflector, was built to work as an active sensor where the analyte species were incorporated inside the resonant cavity to increase sensitivity.

Paper Details

Date Published: 15 May 1998
PDF: 8 pages
Proc. SPIE 3270, Methods for Ultrasensitive Detection, (15 May 1998); doi: 10.1117/12.308385
Show Author Affiliations
Sergio Brito Mendes, Optical Sciences Ctr./Univ. of Arizona (United States)
Seppo Honkanen, Optical Sciences Ctr./Univ. of Arizona (United States)
Mahmoud Fallahi, Optical Sciences Ctr./Univ. of Arizona (United States)
Nasser Peyghambarian, Optical Sciences Ctr./Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 3270:
Methods for Ultrasensitive Detection
Bryan L. Fearey, Editor(s)

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