Suspended Ring-Core Photonic Crystal Fiber Gas Sensor With High Sensitivity and Fast Response

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 capill...

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Bibliographic Details
Published in:IEEE photonics journal 2015-02, Vol.7 (1), p.1-9
Main Authors: Kassani, Sahar Hosseinzadeh, Khazaeinezhad, Reza, Yongmin Jung, Kobelke, Jens, Kyunghwan Oh
Format: Article
Language:English
Subjects:
fiber optics systems
Gas detectors
Gases
Optical fiber sensors
Optical fibers
photonic crystal fiber
Sensitivity
Sensors
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Summary: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 ~60 μm 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.
ISSN:1943-0655
1943-0647
DOI:10.1109/JPHOT.2015.2396121