Turn-Around Point Long-Period Fiber Grating Fabricated by CO₂ Laser for Refractive Index Sensing
Turn-around point long period fiber gratings (TAP-LPFG) are designed by simulations and fabricated by CO2 laser point-to-point irradiations. It is found that the transmission power of a TAP-LPFG exhibits a large linear range with high sensitivity in response to the surrounding refractive index change. The linear power-refractive index relation enables an intensity based refractive index sensor with significantly simplified calibration and instrumentation. By choosing the grating period, the TAP-LPFG can be designed to operate in different refractive index ranges. The TAP-LPFG sensors are demonstrated for detection of sucrose solutions, refractive index matching liquids and low concentration glucose solutions. Compared with the traditional wavelength-shift based measurement method, intensity based TAP-LPFG sensors may provide a cost effective solution for fast and in situ detection of refractive index changes.
X. Lan et al., "Turn-Around Point Long-Period Fiber Grating Fabricated by CO₂ Laser for Refractive Index Sensing," Sensors and Actuators B: Chemical, vol. 177, pp. 1149-1155, Elsevier, Feb 2013.
The definitive version is available at http://dx.doi.org/10.1016/j.snb.2012.12.006
Electrical and Computer Engineering
United States. Department of Energy
National Science Foundation (U.S.)
Keywords and Phrases
Cost-effective solutions; Glucose solution; Grating periods; High sensitivity; Intensity-based; Linear range; Long period fiber grating; Low concentrations; Measurement methods; Optical fiber sensor; Refractive index changes; Refractive index matching; Refractive index sensing; Refractive index sensor; Sucrose solution; Surrounding refractive indices (SRI); Transmission power; Turn-arounds, Carbon dioxide; Glucose; Glucose sensors; Lasers; Refractometers; Semiconductor quantum wells; Sensors; Sugar (sucrose), Refractive index; Intensity based measurement; Turn-around point long period fiber gratings
International Standard Serial Number (ISSN)
Article - Journal
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