Design of long period fiber grating with optimal sensitivity for detecting adhesion of nano-layer on the fiber surface

Palas Biswas; Tanoy Kumar Dey; Nandini Basumallick; Prasanta Kumar Sinha; Kamal Dasgupta; Somnath Bandyopadhyay

doi:10.1117/12.2059690

2 June 2014 Design of long period fiber grating with optimal sensitivity for detecting adhesion of nano-layer on the fiber surface

Palas Biswas, Tanoy Kumar Dey, Nandini Basumallick, Prasanta Kumar Sinha, Kamal Dasgupta, Somnath Bandyopadhyay

Author Affiliations +

Proceedings Volume 9157, 23rd International Conference on Optical Fibre Sensors; 91573F (2014) https://doi.org/10.1117/12.2059690
Event: OFS2014 23rd International Conference on Optical Fiber Sensors, 2014, Santander, Spain

Abstract

For detecting bio-molecular interaction using long period grating (LPG) we believe that a quantitative data concerning sensitivity for addition of layers on the surface and subsequently to optimize the same appears to be more usefull than defining LPG sensitivity for a surrounding refractive index change in bulk form. For the first time, to the best of our knowledge, we quantify the shift of resonant wavelength (Δλ_res) of the mode of interest around the transition point as a function of unit bi-layer thickness (Δd) of poly-electrolyte, deposited by ionic self assembly, and subsequently optimize the sensitivity Δλ_res/Δd. Experimental result show that a shift of ~12.5 nm/bi-layer is possible with optimum number of bi-layer deposition.

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Palas Biswas, Tanoy Kumar Dey, Nandini Basumallick, Prasanta Kumar Sinha, Kamal Dasgupta, and Somnath Bandyopadhyay "Design of long period fiber grating with optimal sensitivity for detecting adhesion of nano-layer on the fiber surface ", Proc. SPIE 9157, 23rd International Conference on Optical Fibre Sensors, 91573F (2 June 2014); https://doi.org/10.1117/12.2059690

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