27 May 2016 Grapefruit photonic crystal fiber sensor for gas sensing application
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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.
© 2016 Society of Photo-Optical Instrumentation Engineers (SPIE)
Chuanyi Tao, Heming Wei, Yinian Zhu, Sridhar Krishnaswamy, "Grapefruit photonic crystal fiber sensor for gas sensing application," Optical Engineering 55(5), 057103 (27 May 2016). https://doi.org/10.1117/1.OE.55.5.057103 . Submission:
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