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Title: Generation and performance of localised surface plasmons utilising nano-scale structured multi-layered thin films deposited upon Dshaped optical fiber
Authors: Allsop, Thomas P. 
Neal, Ron M. 
Mou, Chengbo 
Dvorak, Martin 
Rozhin, Aleksey 
Kalli, Kyriacos 
Webb, David J. 
Keywords: Localised surface plasmons;Structured thin films;Nano-scale;Optical fibre;Optical fibre sensing
Category: Electrical Engineering - Electronic Engineering - Information Engineering
Field: Engineering and Technology
Issue Date: 4-Nov-2013
Publisher: SPIE
Source: Proceedings of SPIE - The International Society for Optical Engineering, 8816, art. no. 881613; Nanoengineering: Fabrication, Properties, Optics, and Devices X, 2013, San Diego, CA, United States
Journal: Proceedings of SPIE - The International Society for Optical Engineering 
Conference: Nanoengineering: Fabrication, Properties, Optics, and Devices 
Abstract: A new generation of surface plasmonic optical fibre sensors is fabricated using multiple coatings deposited on a lapped section of a single mode fibre. Post-deposition UV laser irradiation using a phase mask produces a nano-scaled surface relief grating structure, resembling nano-wires. The overall length of the individual corrugations is approximately 14 μm with an average full width half maximum of 100 nm. Evidence is presented to show that these surface structures result from material compaction created by the silicon dioxide and germanium layers in the multi-layered coating and the surface topology is capable of supporting localised surface plasmons. The coating compaction induces a strain gradient into the D-shaped optical fibre that generates an asymmetric periodic refractive index profile which enhances the coupling of the light from the core of the fibre to plasmons on the surface of the coating. Experimental data are presented that show changes in spectral characteristics after UV processing and that the performance of the sensors increases from that of their pre-UV irradiation state. The enhanced performance is illustrated with regards to change in external refractive index and demonstrates high spectral sensitivities in gaseous and aqueous index regimes ranging up to 4000 nm/RIU for wavelength and 800 dB/RIU for intensity. The devices generate surface plasmons over a very large wavelength range, (visible to 2 μm) depending on the polarization state of the illuminating light.
ISBN: 978-081949666-9
ISSN: 0277-786X
DOI: 10.1117/12.2023926
Rights: © 2013 SPIE.
Type: Conference Papers
Appears in Collections:Δημοσιεύσεις σε συνέδρια/Conference papers

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