Suspended ring-core photonic crystal fiber gas sensor with high sensitivity and fast response

Kassani, Sahar Hosseinzadeh, Khazaeinezhad, Reza, Jung, Yongmin, Kobelke, Jens and Oh, Kyunghwan (2015) Suspended ring-core photonic crystal fiber gas sensor with high sensitivity and fast response. IEEE Photonics Journal, 7 (1), 1-9. (doi:10.1109/JPHOT.2015.2396121).

Abstract

We demonstrate the design and fabrication of an in-line evanescent field gas sensor based on a novel suspended ring-core photonic crystal fiber (PCF) to further overcome limitations in sensing capability. The suspended ring-core PCF is made by the stack-and-draw technique with a large central capillary of ~60µm and adapted small capillaries in a larger cladding tube. Sensing capabilities of two variations of the proposed suspended ring-core PCFs were investigated experimentally by detecting absorption lines of acetylene gas. The sensitivity of the two PCF structures was also numerically analyzed using a full-vectorial finite-element method. The dynamic response of the sensors was quantified in detail. The results demonstrated significant improvement in both sensitivity and response time of the suspended ring-core PCF as this special PCF can provide larger gas diffusion and higher overlap between the sensing species and the guided light than either a Ge-doped ring defect PCF or a conventional index-guided PCF.

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Contributors

Author: Yongmin Jung

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