Bandyopadhyay, SankhyabrataDel Villar, IgnacioBasumallick, NandiniBiswas, PalasDey, Tanoy KumarBandyopadhyay, Somnath2018-03-272018-03-272018S. Bandyopadhyay, I. Del Villar, N. Basumallick, P. Biswas, T. K. Dey and S. Bandyopadhyay, "Long Period Fiber Grating for Biosensing: An Improved Design Methodology to Enhance Add-Layer Sensitivity," in Journal of Lightwave Technology, vol. 36, no. 4, pp. 1178-1184, Feb.15, 15 2018. doi: 10.1109/JLT.2017.27545490733-8724 (Print)1558-2213 (Electronic)10.1109/JLT.2017.2754549https://academica-e.unavarra.es/handle/2454/28093We present our theoretical study on the design of LPFG sensor where its add-layer sensitivity is enhanced. addlayer sensitivity quantifies the sensitivity of the sensor to the changes taking place within few tens of nanometers around the receptor molecules. Two different methodologies: the use of dual overlay layer and tailoring of the intermodal separation between two cladding modes, have been used to enhance the add-layer sensitivity. Using coupled mode analysis we compute several examples to carry out a detailed comparative analysis between the results obtained, focusing on the cladding mode near mode transition.application/pdfeng© 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.Long period fiber gratingCouple mode theoryCladding modesAdd-layer sensingBio-sensinginfo:eu-repo/semantics/articleinfo:eu-repo/semantics/openAccess