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Proceedings Paper

Optical sensor based on the single-arm dual-mode polymeric waveguide interferometer
Author(s): Sergey S. Sarkisov; Michael J. Curley; Darnell E. Diggs; Huaisong Guo; Ronald D. Clark; Grigory Adamovsky
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Paper Abstract

Single arm dual mode optical waveguide interferometer utilizes interference between two modes of different order. Sensing effect results from the change in traveling conditions of the modes caused by the environment. The waveguide is made as an open asymmetric structure containing a dye-doped high temperature polyimide film onto a silica substrate. It is more sensitive to the change of environment than its conventional polarimetric analog using orthogonal modes (TE and TM) of the same order. The sensor still preserves the option of operating in polarimetric regime using a variety of mode combinations such as TE0/TM0 (conventional), TE0/TM1, TE1/TM0, or TE1/TM1 but can also work in nonpolarimetric regime using combinations TE0/TE1 or TM0/TM1. Experimental temperature sensor based on TE0/TE1 combination demonstrates 2(pi) -phase shift between interfering modes in response to 2 degree Celsius-change of the ambient temperature. Utilization of different mode combinations simultaneously makes the device more versatile. Application of the sensor to gas sensing is based on doping polymer film with an organic indicator dye targeting a particular gaseous reagent. Change of the optical absorption spectrum of the dye caused by the gas results in change of the reactive index of the dye-doped polymer film which is detected by the sensor. We propose to use indicator dyes based on temperature durable metal substituted phthalocyanines (such as Octadecyloxy copper phthalocynaine) which demonstrates a significant change of the absorption spectrum being exposed to acidulous or alkaline atmosphere. We discuss the design of the experimental gas chamber for testing the interferometer as a NOX sensor.

Paper Details

Date Published: 17 April 1998
PDF: 11 pages
Proc. SPIE 3281, Polymer Photonic Devices, (17 April 1998); doi: 10.1117/12.305432
Show Author Affiliations
Sergey S. Sarkisov, Alabama A&M Univ. (United States)
Michael J. Curley, Alabama A&M Univ. (United States)
Darnell E. Diggs, Alabama A&M Univ. (United States)
Huaisong Guo, New Mexico Highlands Univ. (United States)
Ronald D. Clark, New Mexico Highlands Univ. (United States)
Grigory Adamovsky, NASA Lewis Research Ctr. (United States)

Published in SPIE Proceedings Vol. 3281:
Polymer Photonic Devices
Bernard Kippelen; Donal D. C. Bradley, Editor(s)

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