Grapefruit photonic crystal fiber sensor for gas sensing application

Chuanyi Tao; Heming Wei; Yinian Zhu; Sridhar Krishnaswamy

doi:10.1117/1.OE.55.5.057103

27 May 2016 Grapefruit photonic crystal fiber sensor for gas sensing application

Chuanyi Tao, Heming Wei, Yinian Zhu, Sridhar Krishnaswamy

Author Affiliations +

Optical Engineering, Vol. 55, Issue 5, 057103 (May 2016). https://doi.org/10.1117/1.OE.55.5.057103

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 ppb_v at 25°C, and a sensitivity of 2 pm ppb_v⁻¹ can be achieved.

Citation Download Citation

Chuanyi Tao, Heming Wei, Yinian Zhu, and 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

Published: 27 May 2016

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