Enhanced spectral sensitivity of fibre long period gratings to refractive index of aqueous solutions utilising copper patterned coatings

Thomas D.P. Allsop; Helen L. Dobb; Ron Neal; Kyriacos Kalli; Christos Themistos; B.M.A. Rahman; David Webb; Des J. Mapps; Ian Bennion

doi:10.1117/12.647515

Enhanced spectral sensitivity of fibre long period gratings to refractive index of aqueous solutions utilising copper patterned coatings

Thomas D.P. Allsop^*, Helen L. Dobb, Ron Neal, Kyriacos Kalli, Christos Themistos, B.M.A. Rahman, David Webb, Des J. Mapps, Ian Bennion

^*Corresponding author for this work

Aston Institute of Photonic Technologies (AiPT)

Research output: Chapter in Book/Published conference output › Conference publication

Abstract

A set of long period grating devices have been fabricated in photosensitive single mode fibre coated with a series of copper rings (period of 380μm, 50% duty cycle and length of 4cm). The long period gratings were inscribed with a uniform UV-laser exposure across the entire length of the copper ring patterned coating. The devices ranged in copper thickness from 0.5μm to 1.5μm. In addition, a control long period grating was fabricated in the same type of fibre with the same period for comparison. The refractive index and temperature spectral sensitivity of these devices were investigated and it was found that the index and temperature sensitivity is a function of the thickness of the copper rings, as supported by theoretical modelling. Furthermore, the index sensitivity of these devices in the 1.333 index region is greater than the control long period grating. The patterned 0.5μm coated long period grating gave a sensitivity of Δλ/Δn = -74 nm leading to a resolution of 1.4×10^-3 compared to the control which had a sensitivity of Δλ/Δn = -32 nm with a resolution of 3.2×10^-3 in the index region of 1.320 to 1.380 (aqueous solution regime). This demonstrates a two fold increase in the sensitivity. This novel fibre long period grating device shows potential for increasing the resolution of measurements of the index of aqueous solutions.

Original language	English
Title of host publication	Optical fibers and sensors for medical diagnostics and treatment applications VI
Editors	Israel Gannot
Publisher	SPIE
Number of pages	9
Volume	6083
ISBN (Print)	0-8194-6125-3, 978-0-8194-6125-4
DOIs	https://doi.org/10.1117/12.647515
Publication status	Published - 8 May 2006
Event	Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications VI - San Jose, CA, United States Duration: 21 Jan 2006 → 22 Jan 2006

Conference

Conference	Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications VI
Country/Territory	United States
City	San Jose, CA
Period	21/01/06 → 22/01/06

Bibliographical note

Allsop, Thomas; Dobb, Helen L.; Neal, Ron; Kalli, Kyriacos; Themistos, Christos; Rahman, B.M.A.; Webb, David; Mapps, Des J.; Bennion, Ian, "Enhanced spectral sensitivity of fibre long period gratings to refractive index of aqueous solutions utilising copper patterned coatings." Optical fibers and sensors for medical diagnostics and treatment applications VI. ed. / Israel Gannot. Vol. 6083 SPIE, 2006.

Copyright 2006 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.

http://dx.doi.org/10.1117/12.647515

Keywords

index sensing
long period gratings
coatings

Access to Document

10.1117/12.647515

Enhanced spectral sensitivity of fibre long period gratings
Allsop, Thomas; Dobb, Helen L.; Neal, Ron; Kalli, Kyriacos; Themistos, Christos; Rahman, B.M.A.; Webb, David; Mapps, Des J.; Bennion, Ian, "Enhanced spectral sensitivity of fibre long period gratings to refractive index of aqueous solutions utilising copper patterned coatings." Optical fibers and sensors for medical diagnostics and treatment applications VI. ed. / Israel Gannot. Vol. 6083 SPIE, 2006. Copyright 2006 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. http://dx.doi.org/10.1117/12.647515
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Cite this

Allsop, T. D. P., Dobb, H. L., Neal, R., Kalli, K., Themistos, C., Rahman, B. M. A., Webb, D., Mapps, D. J., & Bennion, I. (2006). Enhanced spectral sensitivity of fibre long period gratings to refractive index of aqueous solutions utilising copper patterned coatings. In I. Gannot (Ed.), Optical fibers and sensors for medical diagnostics and treatment applications VI (Vol. 6083). Article 60830S SPIE. https://doi.org/10.1117/12.647515

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title = "Enhanced spectral sensitivity of fibre long period gratings to refractive index of aqueous solutions utilising copper patterned coatings",

abstract = "A set of long period grating devices have been fabricated in photosensitive single mode fibre coated with a series of copper rings (period of 380μm, 50% duty cycle and length of 4cm). The long period gratings were inscribed with a uniform UV-laser exposure across the entire length of the copper ring patterned coating. The devices ranged in copper thickness from 0.5μm to 1.5μm. In addition, a control long period grating was fabricated in the same type of fibre with the same period for comparison. The refractive index and temperature spectral sensitivity of these devices were investigated and it was found that the index and temperature sensitivity is a function of the thickness of the copper rings, as supported by theoretical modelling. Furthermore, the index sensitivity of these devices in the 1.333 index region is greater than the control long period grating. The patterned 0.5μm coated long period grating gave a sensitivity of Δλ/Δn = -74 nm leading to a resolution of 1.4×10-3 compared to the control which had a sensitivity of Δλ/Δn = -32 nm with a resolution of 3.2×10-3 in the index region of 1.320 to 1.380 (aqueous solution regime). This demonstrates a two fold increase in the sensitivity. This novel fibre long period grating device shows potential for increasing the resolution of measurements of the index of aqueous solutions.",

keywords = "index sensing, long period gratings, coatings",

author = "Allsop, {Thomas D.P.} and Dobb, {Helen L.} and Ron Neal and Kyriacos Kalli and Christos Themistos and B.M.A. Rahman and David Webb and Mapps, {Des J.} and Ian Bennion",

note = "Allsop, Thomas; Dobb, Helen L.; Neal, Ron; Kalli, Kyriacos; Themistos, Christos; Rahman, B.M.A.; Webb, David; Mapps, Des J.; Bennion, Ian, {"}Enhanced spectral sensitivity of fibre long period gratings to refractive index of aqueous solutions utilising copper patterned coatings.{"} Optical fibers and sensors for medical diagnostics and treatment applications VI. ed. / Israel Gannot. Vol. 6083 SPIE, 2006. Copyright 2006 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. http://dx.doi.org/10.1117/12.647515; Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications VI ; Conference date: 21-01-2006 Through 22-01-2006",

year = "2006",

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doi = "10.1117/12.647515",

language = "English",

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Allsop, TDP, Dobb, HL, Neal, R, Kalli, K, Themistos, C, Rahman, BMA, Webb, D, Mapps, DJ & Bennion, I 2006, Enhanced spectral sensitivity of fibre long period gratings to refractive index of aqueous solutions utilising copper patterned coatings. in I Gannot (ed.), Optical fibers and sensors for medical diagnostics and treatment applications VI. vol. 6083, 60830S, SPIE, Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications VI, San Jose, CA, United States, 21/01/06. https://doi.org/10.1117/12.647515

Enhanced spectral sensitivity of fibre long period gratings to refractive index of aqueous solutions utilising copper patterned coatings. / Allsop, Thomas D.P.; Dobb, Helen L.; Neal, Ron et al.
Optical fibers and sensors for medical diagnostics and treatment applications VI. ed. / Israel Gannot. Vol. 6083 SPIE, 2006. 60830S.

Research output: Chapter in Book/Published conference output › Conference publication

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T1 - Enhanced spectral sensitivity of fibre long period gratings to refractive index of aqueous solutions utilising copper patterned coatings

AU - Allsop, Thomas D.P.

AU - Dobb, Helen L.

AU - Neal, Ron

AU - Kalli, Kyriacos

AU - Themistos, Christos

AU - Rahman, B.M.A.

AU - Webb, David

AU - Mapps, Des J.

AU - Bennion, Ian

N1 - Allsop, Thomas; Dobb, Helen L.; Neal, Ron; Kalli, Kyriacos; Themistos, Christos; Rahman, B.M.A.; Webb, David; Mapps, Des J.; Bennion, Ian, "Enhanced spectral sensitivity of fibre long period gratings to refractive index of aqueous solutions utilising copper patterned coatings." Optical fibers and sensors for medical diagnostics and treatment applications VI. ed. / Israel Gannot. Vol. 6083 SPIE, 2006. Copyright 2006 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. http://dx.doi.org/10.1117/12.647515

PY - 2006/5/8

Y1 - 2006/5/8

N2 - A set of long period grating devices have been fabricated in photosensitive single mode fibre coated with a series of copper rings (period of 380μm, 50% duty cycle and length of 4cm). The long period gratings were inscribed with a uniform UV-laser exposure across the entire length of the copper ring patterned coating. The devices ranged in copper thickness from 0.5μm to 1.5μm. In addition, a control long period grating was fabricated in the same type of fibre with the same period for comparison. The refractive index and temperature spectral sensitivity of these devices were investigated and it was found that the index and temperature sensitivity is a function of the thickness of the copper rings, as supported by theoretical modelling. Furthermore, the index sensitivity of these devices in the 1.333 index region is greater than the control long period grating. The patterned 0.5μm coated long period grating gave a sensitivity of Δλ/Δn = -74 nm leading to a resolution of 1.4×10-3 compared to the control which had a sensitivity of Δλ/Δn = -32 nm with a resolution of 3.2×10-3 in the index region of 1.320 to 1.380 (aqueous solution regime). This demonstrates a two fold increase in the sensitivity. This novel fibre long period grating device shows potential for increasing the resolution of measurements of the index of aqueous solutions.

AB - A set of long period grating devices have been fabricated in photosensitive single mode fibre coated with a series of copper rings (period of 380μm, 50% duty cycle and length of 4cm). The long period gratings were inscribed with a uniform UV-laser exposure across the entire length of the copper ring patterned coating. The devices ranged in copper thickness from 0.5μm to 1.5μm. In addition, a control long period grating was fabricated in the same type of fibre with the same period for comparison. The refractive index and temperature spectral sensitivity of these devices were investigated and it was found that the index and temperature sensitivity is a function of the thickness of the copper rings, as supported by theoretical modelling. Furthermore, the index sensitivity of these devices in the 1.333 index region is greater than the control long period grating. The patterned 0.5μm coated long period grating gave a sensitivity of Δλ/Δn = -74 nm leading to a resolution of 1.4×10-3 compared to the control which had a sensitivity of Δλ/Δn = -32 nm with a resolution of 3.2×10-3 in the index region of 1.320 to 1.380 (aqueous solution regime). This demonstrates a two fold increase in the sensitivity. This novel fibre long period grating device shows potential for increasing the resolution of measurements of the index of aqueous solutions.

KW - index sensing

KW - long period gratings

KW - coatings

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U2 - 10.1117/12.647515

DO - 10.1117/12.647515

M3 - Conference publication

SN - 0-8194-6125-3

SN - 978-0-8194-6125-4

VL - 6083

BT - Optical fibers and sensors for medical diagnostics and treatment applications VI

A2 - Gannot, Israel

PB - SPIE

T2 - Optical Fibers and Sensors for Medical Diagnostics and Treatment Applications VI

Y2 - 21 January 2006 through 22 January 2006

ER -

Enhanced spectral sensitivity of fibre long period gratings to refractive index of aqueous solutions utilising copper patterned coatings

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Bibliographical note

Keywords

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