Dual-peak long-period fiber gratings with enhanced refractive index sensitivity by finely tailored mode dispersion that uses the light cladding etching technique


We have experimentally investigated the mode dispersion property and refractive index sensitivity of dual-peak long-period fiber gratings (LPGs) that were sensitized by hydrofluoric acid (HF) etching. The nature of the coupled cladding modes close to the dispersion turning point makes the dual-peak LPGs ultrasensitive to cladding property, permitting a fine tailoring of the mode dispersion and index sensitivity by the light cladding etching method using HF acid of only 1% concentration. As an implementation of an optical biosensor, the etched device was used to detect the concentration of hemoglobin protein in a sugar solution, showing a sensitivity as high as 20 nm/1%.

Uncontrolled Keywords: mode dispersion, refractive index sensitivity, dual-peak long-period fiber gratings, LPGs, sensitized, hydrofluoric acid etching, coupled cladding modes, dispersion turning point, cladding property, light cladding etching, cocentration, hemoglobin protein, sugar solution
Publication ISSN: 0003-6935
Last Modified: 23 Oct 2019 11:36
Date Deposited: 14 Apr 2011 10:34
Published Date: 2007-02
Authors: Chen, Xianfeng F.
Zhou, Kaiming
Zhang, Lin
Bennion, Ian


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