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Proceedings Paper

Heater integrated nanopatterned optical fiber-tip to realize a reusable gas sensor
Author(s): Shawana Tabassum; Liang Dong; Ratnesh Kumar
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Paper Abstract

We present the first heater integrated nanostructured optical fiber of 200 μm diameter to realize a high-sensitivity and reusable fiber-optic gas sensor. In our guided mode resonance-enabled fiber-optic gas sensor, resonance shifts upon the adsorption of the analytes on the graphene oxide (GO) coated sensor surface. For repeated use of this sensor, a regeneration of the sensor surface is required by a complete desorption of the analyte molecules from the GO layer. In our presented design, this has been achieved by the integration of a controllable heater at the fiber tip. The heater was fabricated by embedding a helical thin nichrome wire wrapped along a cylindrical rod into a precursor solution of polydimethylsiloxane, and subsequently removing the rod from the cured elastomer and leaving the helical wire inside the elastomer. Thus, a cylindrical cavity of length 16 mm and diameter 4 mm surrounded by the helical wire was formed that then contains the fiber-tip sensor. For the ethylene gas analyte, we demonstrated the reversibility of the heater integrated fiber-tip sensor, with a tunable recovery time. Owing to the rapid heat transfer from the helical wire to the encased fiber-tip sensor, the heater integrated fiber-tip sensor responds to heating in only about 2.5 min. The high resonance sensitivity of the nanopatterned fiber-tip to its surrounding refractive index, in conjunction with excellent repeatability through integrated heating for surface regeneration, enables a practical fiber-tip based remote sensing.

Paper Details

Date Published: 4 September 2018
PDF: 8 pages
Proc. SPIE 10755, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XII, 107550G (4 September 2018); doi: 10.1117/12.2319440
Show Author Affiliations
Shawana Tabassum, Iowa State Univ. (United States)
Liang Dong, Iowa State Univ. (United States)
Ratnesh Kumar, Iowa State Univ. (United States)

Published in SPIE Proceedings Vol. 10755:
Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications XII
Shizhuo Yin; Ruyan Guo, Editor(s)

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