High sensitivity of dual resonant peaks of long-periodfibre grating to surrounding refractive index changes
Chester Shu(Fiberhome Technology Group (China)), Li Kuo Zhu(Fiberhome Technology Group (China)), Jiang Jiang(Fiberhome Technology Group (China)), Yun‐Bo Shi(Fiberhome Technology Group (China)), Hao Huang(Huazhong University of Science and Technology)
Cited by 63
Abstract
The spectral response of the dual resonant peaks of a 100 µm period fibre grating to surrounding refractive index (SRI) from n = 1 to 1.74 has been investigated. The two peaks were found to shift in opposite directions over –180 and +300 nm, respectively, as the SRI changed. A novel chemical sensing scheme with enhanced sensitivity based on the measurement of the separation of the two peaks instead of a shift in a single peak is also presented.
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