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Optical Engineering

Grapefruit photonic crystal fiber sensor for gas sensing application
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Paper Abstract

Use of long period gratings (LPGs) formed in grapefruit photonic crystal fiber (PCF) with thin-film overlay coated on the inner surface of air holes for gas sensing is demonstrated. The finite-element method was used to numerically simulate the grapefruit PCF–LPG modal coupling characteristics and resonance spectral response with respect to the refractive index of thin-film inside the holey region. A gas analyte-induced index variation of the thin-film immobilized on the inner surface of the holey region of the fiber can be observed by a shift of the resonance wavelength. As an example, we demonstrate a 2,4-dinitrotoluene (DNT) sensor using grapefruit PCF–LPGs. The sensor exhibits a wavelength blue-shift of ∼820  pm as a result of exposure to DNT vapor with a vapor pressure of 411  ppbv at 25°C, and a sensitivity of 2  pm ppbv−1 can be achieved.

Paper Details

Date Published: 27 May 2016
PDF: 8 pages
Opt. Eng. 55(5) 057103 doi: 10.1117/1.OE.55.5.057103
Published in: Optical Engineering Volume 55, Issue 5
Show Author Affiliations
Chuanyi Tao, Chongqing Univ. of Technology (China)
Northwestern Univ. (United States)
Heming Wei, Northwestern Univ. (United States)
Yinian Zhu, Northwestern Univ. (United States)
Sridhar Krishnaswamy, Northwestern Univ. (United States)

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