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Sensors 2017, 17(11), 2459;

Waveguide Bragg Gratings in Ormocer®s for Temperature Sensing

Applied Laser and Photonics Group, University of Applied Sciences Aschaffenburg, 63743 Aschaffenburg, Germany
Chair of Electron Devices, Friedrich-Alexander University Erlangen, 91058 Erlangen, Germany
Fraunhofer Institute for Integrated Systems and Device Technology (IISB) Erlangen, 91058 Erlangen, Germany
Author to whom correspondence should be addressed.
Received: 28 September 2017 / Revised: 17 October 2017 / Accepted: 20 October 2017 / Published: 26 October 2017
(This article belongs to the Special Issue Fiber Bragg Grating Based Sensors)
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Embedded channel waveguide Bragg gratings are fabricated in the Ormocer® hybrid polymers OrmoComp®, OrmoCore, and OrmoClad by employing a single writing step technique based on phase mask technology and KrF excimer laser irradiation. All waveguide Bragg gratings exhibit well-defined reflection peaks within the telecom wavelengths range with peak heights of up to 35 dB and −3 dB-bandwidths of down to 95 pm. Furthermore, the dependency of the fabricated embedded channel waveguide Bragg gratings on changes of the temperature and relative humidity are investigated. Here, we found that the Bragg grating in OrmoComp® is significantly influenced by humidity variations, while the Bragg gratings in OrmoCore and OrmoClad exhibit linear and considerably high temperature sensitivities of up to −250 pm/ C and a linear dependency on the relative humidity in the range of −9 pm/%. View Full-Text
Keywords: Bragg grating; temperature; humidity; hybrid polymer; Ormocer® Bragg grating; temperature; humidity; hybrid polymer; Ormocer®

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Girschikofsky, M.; Rosenberger, M.; Förthner, M.; Rommel, M.; Frey, L.; Hellmann, R. Waveguide Bragg Gratings in Ormocer®s for Temperature Sensing. Sensors 2017, 17, 2459.

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