Highly Sensitive Photonic Crystal Fiber-Based Refractive Index Sensing Using Mechanical Long-Period Grating

We experimentally demonstrate a novel refractive index (RI) sensor with the measurand infiltrated into the air channels of a single mode photonic crystal fiber (PCF). A tunable long-period grating is formed in a short length of PCF by use of the periodic mechanical pressure. Resonance shift with the...

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Bibliographic Details
Published in:IEEE photonics technology letters 2008-10, Vol.20 (20), p.1688-1690
Main Authors: Yu, X., Shum, P., Ren, G.B.
Format: Article
Language:English
Subjects:
Channels
Crystal fibers
Devices
Fiber gratings
Fiber sensor
Liquids
Mechanical sensors
Mechanical variables measurement
Optical fiber sensors
Optoelectronic and photonic sensors
photonic crystal fiber
Photonic crystal fibers
Photonic crystals
Photonics
Refractive index
refractive index sensor
Refractivity
Resonance
Thermal stability
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Summary:We experimentally demonstrate a novel refractive index (RI) sensor with the measurand infiltrated into the air channels of a single mode photonic crystal fiber (PCF). A tunable long-period grating is formed in a short length of PCF by use of the periodic mechanical pressure. Resonance shift with the change of the infiltrated liquid is observed with a sensitivity of 4.1times 10 -6 RI unit in a refractive index range from 1.32 to 1.39. The thermal stability of the pure-silica-based PCF device shows a three times better performance compared with conventional single mode fiber.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2008.2003376