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23 November 2009 Characteristics analysis of cascaded long-period gratings with nm-thick film coating
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Abstract
Cascaded long period grating with film coating is sensitive to the thickness and refractive index of the film material and the surrounding refractive index, so it can be used in the applications such as gas sensing, liquid concentration sensing and bio-sensing. In this paper, the characteristic of cascaded long period grating coating with higher refractive index nanostructured film overlay is investigated theoretically by using coupled-mode theory and transfer matrix method. The responses of interference fringe peak wavelength to the thickness and refractive index of the film and the surrounding refractive index are numerical calculated. The theoretical simulation results show that the minima wavelength of the interference fringes within the long period gratings attenuation bands are sensitive to the thickness and refractive index of the film coating and the refractive index of the surrounding environment. By choosing these parameters optimally, the sensitivity of the peak wavelength shift of the interference fringes can be enhanced. The theoretical analysis can provide guidance to the application of the nanostructured film coated cascaded long period grating sensor.
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Xiujuan Yu, Min Zhang, Paul Childs, Liwei Wang, Shurong Lai, and Yanbiao Liao "Characteristics analysis of cascaded long-period gratings with nm-thick film coating", Proc. SPIE 7508, 2009 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications, 75081N (23 November 2009); https://doi.org/10.1117/12.839550
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