Long-period fiber grating: a specific design for biosensing applications

Sankhyabrata Bandyopadhyay; Palas Biswas; Francesco Chiavaioli; Tanoy Kumar Dey; Nandini Basumallick; Cosimo Trono; Ambra Giannetti; Sara Tombelli; Francesco Baldini; Somnath Bandyopadhyay

doi:10.1364/AO.56.009846

Applied Optics
Vol. 56,
Issue 35,
pp. 9846-9853
(2017)
•https://doi.org/10.1364/AO.56.009846

Long-period fiber grating: a specific design for biosensing applications

Sankhyabrata Bandyopadhyay, Palas Biswas, Francesco Chiavaioli, Tanoy Kumar Dey, Nandini Basumallick, Cosimo Trono, Ambra Giannetti, Sara Tombelli, Francesco Baldini, and Somnath Bandyopadhyay

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Sankhyabrata Bandyopadhyay, Palas Biswas, Francesco Chiavaioli, Tanoy Kumar Dey, Nandini Basumallick, Cosimo Trono, Ambra Giannetti, Sara Tombelli, Francesco Baldini, and Somnath Bandyopadhyay, "Long-period fiber grating: a specific design for biosensing applications," Appl. Opt. 56, 9846-9853 (2017)

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Table of Contents Category
- Fiber Optics and Optical Communications
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About this Article
History
- Original Manuscript: September 18, 2017
- Revised Manuscript: November 13, 2017
- Manuscript Accepted: November 14, 2017
- Published: December 8, 2017
Virtual Issues
Virtual Journal for Biomedical Optics Vol. 13, Iss. 2

Abstract

In this paper, a detailed investigation on the modeling of long-period fiber grating (LPFG) sensors is discussed with the aim of providing a more realistic solution for their use in biosensing. Add-layer sensitivity, i.e., sensitivity of the sensor to an additional layer adhered onto the fiber surface, is quantified and a clear and complete analysis about the influence of the average thickness of the deposited biological sensing layers, as well as the change in refractive index of these layers, on the resonant wavelength of the cladding modes of an LPFG is provided. Add-layer sensitivity of LPFG sensors close to mode transition (MT) and also at turn-around point (TAP) are taken into account. Adsorbed layer thicknesses, as estimated from measured wavelength shifts of the LPFG, are found to have a good match with the values obtained through other measurement techniques.

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RL (nm)	$S$ (nm/RIU) (1.333–1.340)	$S_{h}$ (nm/nm Attachment of AL)	$S_{LRI}$ (nm/Unit Surface RI)
Without BFL and RL ( $Q_{1}$ )	$\sim 2500$	$\sim 4.7$	$\sim 168$
10 ( $Q_{2}$ )	$\sim 2500$	$\sim 4.7$	$\sim 168$
20 ( $Q_{3}$ )	$\sim 2000$	$\sim 3.2$	$\sim 135$
50 ( $Q_{4}$ )	$\sim 400$	$\sim 0.5$	$\sim 28$
100 ( $Q_{5}$ )	$\sim 50$	$\sim 0.02$	$\sim 0.01$

RL (nm)	OOT [ $RI = 1.7$ ] (nm)	OOT [ $RI = 2.0$ ] (nm)
Without BFL and RL	$\sim 150$	$\sim 69$
10	$\sim 143.5$ (a)	$\sim 65$
20	$\sim 137$ (b)	$\sim 61$
50	$\sim 118$ (c)	$\sim 53.5$
100	$\sim 90$ (d)	$\sim 41$

RL (nm)	$S$ (nm/RIU) (1.333–1.340)	$S_{h}$ (nm/nm Attachment of AL)	$S_{LRI}$ (nm/Unit Surface RI)
Without BFL and RL	$\sim 1788$	$\sim 1.93$	$\sim 120$
10	$\sim 1560$	$\sim 1.78$	$\sim 102$
20	$\sim 1105$	$\sim 0.93$	$\sim 78$
50	$\sim 876$	$\sim 0.61$	$\sim 60$
100	$\sim 541$	$\sim 0.22$	$\sim 34$

RL (nm)	$S$ (nm/RIU) (1.333–1.340)	$S_{h}$ (nm/nm Attachment of AL)	$S_{LRI}$ (nm/Unit Surface RI)
Without BFL and RL ( $Q_{1}$ )	$\sim 2500$	$\sim 4.7$	$\sim 168$
10 ( $Q_{2}$ )	$\sim 2500$	$\sim 4.7$	$\sim 168$
20 ( $Q_{3}$ )	$\sim 2000$	$\sim 3.2$	$\sim 135$
50 ( $Q_{4}$ )	$\sim 400$	$\sim 0.5$	$\sim 28$
100 ( $Q_{5}$ )	$\sim 50$	$\sim 0.02$	$\sim 0.01$

RL (nm)	OOT [ $RI = 1.7$ ] (nm)	OOT [ $RI = 2.0$ ] (nm)
Without BFL and RL	$\sim 150$	$\sim 69$
10	$\sim 143.5$ (a)	$\sim 65$
20	$\sim 137$ (b)	$\sim 61$
50	$\sim 118$ (c)	$\sim 53.5$
100	$\sim 90$ (d)	$\sim 41$

Francesco Baldini	https://orcid.org/0000-0002-2689-5952
Somnath Bandyopadhyay	https://orcid.org/0000-0002-9141-8159

Abstract

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Equations (7)

Applied Optics