Sensitivity analysis of a square shape apodize fibre Bragg grating chemical sensor assisted by high refractive index bi-directional coupler on both sides

Sanjeev Kumar Raghuwanshi; Yadvendra Singh; Azhar Shadab; Purnendu Shekhar Pandey

doi:10.1117/12.2542890

20 February 2020 Sensitivity analysis of a square shape apodize fibre Bragg grating chemical sensor assisted by high refractive index bi-directional coupler on both sides

Sanjeev Kumar Raghuwanshi, Yadvendra Singh, Azhar Shadab, Purnendu Shekhar Pandey

Author Affiliations +

Proceedings Volume 11233, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XX; 1123319 (2020) https://doi.org/10.1117/12.2542890
Event: SPIE BiOS, 2020, San Francisco, California, United States

Abstract

Special featured Fibre Bragg grating has a great potential to meet the demand of development of highly sensitive optical fibre technology based chemical sensors working in harsh environment. Fibre Bragg grating assisted in between directional coupler could be significantly tuned the power coupling efficiency between two high refractive index layers. In this paper standard si-based FBG has been fabricated with square shape of apodization profile based on Cu-vapour laser and second harmonics generation based technique. Then FBG has been incorporated in between two high refractive index material followed by substrate in either side with low refractive index sensing layer. Finite difference method (FDM) based MATLAB program has been developed to extract the TE/TM modes supported by this proposed composite planar waveguide structure. Sensitivity has been calculated by b − λ graph technique for both angular/wavelength interrogation cases.

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Sanjeev Kumar Raghuwanshi, Yadvendra Singh, Azhar Shadab, and Purnendu Shekhar Pandey "Sensitivity analysis of a square shape apodize fibre Bragg grating chemical sensor assisted by high refractive index bi-directional coupler on both sides", Proc. SPIE 11233, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications XX, 1123319 (20 February 2020); https://doi.org/10.1117/12.2542890

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