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Proceedings Paper

Application of a silica-on-silicon planar optical waveguide Bragg grating sensor for organic liquid compound detection
Author(s): S. Scheurich; S. Belle; R. Hellmann; S. So; I. J. G. Sparrow; G. Emmerson
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Paper Abstract

An evanescent field refractive index sensor consisting of a Bragg grating that is written into a silica-on-silicon planar optical waveguide structure by UV laser radiation is utilized to monitor the composition of liquid binary chemical systems. We have investigated various selected liquid compounds that are commonly used in the pharmaceutical and chemical industry, finding sensitivities on the order of 100nm/RIU and minimum detectable index resolution on the order of 5•10-6 fulfilling industrial demands on detection limits and partly being superior to other electrical transducer systems. The planar structure of the sensor chip allows on chip integration of fluidic structures that we have generated by laser ablation using a pulsed fiber laser, enabling connection to the adjacencies.

Paper Details

Date Published: 18 May 2009
PDF: 8 pages
Proc. SPIE 7356, Optical Sensors 2009, 73561B (18 May 2009); doi: 10.1117/12.820484
Show Author Affiliations
S. Scheurich, Univ. of Applied Sciences (Germany)
S. Belle, Univ. of Applied Sciences (Germany)
R. Hellmann, Univ. of Applied Sciences (Germany)
S. So, Stratophase Ltd. (United Kingdom)
I. J. G. Sparrow, Stratophase Ltd. (United Kingdom)
G. Emmerson, Stratophase Ltd. (United Kingdom)

Published in SPIE Proceedings Vol. 7356:
Optical Sensors 2009
Francesco Baldini; Jiri Homola; Robert A. Lieberman, Editor(s)

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