Materials, Photonic Devices, and Sensors

Grapefruit photonic crystal fiber sensor for gas sensing application

[+] Author Affiliations
Chuanyi Tao

Chongqing University of Technology, Department of Applied Physics, 69 Hongguang Avenue, Banan District, Chongqing 400054, China

Northwestern University, Center for Smart Structures and Materials, 2137 Tech Drive, Evanston, Illinois 60208, United States

Heming Wei, Yinian Zhu, Sridhar Krishnaswamy

Northwestern University, Center for Smart Structures and Materials, 2137 Tech Drive, Evanston, Illinois 60208, United States

Opt. Eng. 55(5), 057103 (May 27, 2016). doi:10.1117/1.OE.55.5.057103
History: Received March 4, 2016; Accepted May 10, 2016
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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  pmppbv1 can be achieved.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Chuanyi Tao ; Heming Wei ; Yinian Zhu and Sridhar Krishnaswamy
"Grapefruit photonic crystal fiber sensor for gas sensing application", Opt. Eng. 55(5), 057103 (May 27, 2016). ; http://dx.doi.org/10.1117/1.OE.55.5.057103


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