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Proceedings Paper

Photonic sensors for explosive detection
Author(s): Ulrike Willer; Rozalia Orghici; Peter Lützow; Wolfgang Schade
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Paper Abstract

A microring resonator is used as a photonic sensor device for the detection of the explosive trinitrotoluene (TNT). Selectivity is achieved by coating the sensor chip with specially designed receptor molecules. The measurand is the shift in resonance frequency of the microring resonator induced by the change in effective index of refraction of the waveguide materials due to adsorption/intercalation of the analyte. The response is linear with concentration and reversible, i.e. the TNT molecules desorb from the sensor surface when it is flushed with carrier gas. This enables online measurements since the sensor can be used again after flushing and no sampling is needed. Insensitivity to other substances is demonstrated. Some chemically similar molecules induce a shift also, but the sensitivity is much lower. The sensing limit for TNT is determined to be 0.5ppb. Simultaneous operation of two ring resonators is demonstrated, proving the capability of a multi species monitoring when the rings are coated with different receptor molecules.

Paper Details

Date Published: 24 January 2011
PDF: 8 pages
Proc. SPIE 7945, Quantum Sensing and Nanophotonic Devices VIII, 79452D (24 January 2011); doi: 10.1117/12.872856
Show Author Affiliations
Ulrike Willer, Clausthal Univ. of Technology (Germany)
Rozalia Orghici, Fraunhofer Heinrich Hertz Institute (Germany)
Peter Lützow, Fraunhofer Heinrich Hertz Institute (Germany)
Wolfgang Schade, Clausthal Univ. of Technology (Germany)
Fraunhofer Heinrich Hertz Institute (Germany)

Published in SPIE Proceedings Vol. 7945:
Quantum Sensing and Nanophotonic Devices VIII
Manijeh Razeghi; Rengarajan Sudharsanan; Gail J. Brown, Editor(s)

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