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Optical fibre-tip probes for SERS: numerical study for design considerations

Optical fibre-tip probes for SERS: numerical study for design considerations
Optical fibre-tip probes for SERS: numerical study for design considerations
Enhancement of sub-wavelength optical fields using sub-micron plasmonic probes has found many applications in chemical, material, biological and medical sciences. The enhancement is via localised surface-plasmon resonance (LSPR) which enables the highly sensitive vibrational-spectroscopy technique of surface-enhanced Raman scattering (SERS). Combining SERS with optical fibres can allow the monitoring of biochemical reactions in-situ with high resolution. Here, we study the electromagnetic-field enhancement of a tapered optical fibre-tip coated with gold nanoparticles (AuNPs) using finite-element simulations. We investigate the electric-field enhancement associated with metallic NPs and study the effect of parameters such as tip-aperture radius, cone angle, nanoparticle size and gaps between them. Our study provides an understanding for the design and application of metal-nanoparticle-coated optical-fibre-tip probes for SERS. The approach of using fibre-coupled delivery adds flexibility and simplifies the system requirements in SERS, making it suitable for cellular imaging and mapping bio-interfaces.
1094-4087
15539-15550
Hutter, Tanya
b9494787-9ae0-4887-b4ee-dbe0a0b774b1
Elliott, Stephen R.
e4a646fb-2898-422a-994d-5c6e166cb4b6
Mahajan, Sumeet
b131f40a-479e-4432-b662-19d60d4069e9
Hutter, Tanya
b9494787-9ae0-4887-b4ee-dbe0a0b774b1
Elliott, Stephen R.
e4a646fb-2898-422a-994d-5c6e166cb4b6
Mahajan, Sumeet
b131f40a-479e-4432-b662-19d60d4069e9

Hutter, Tanya, Elliott, Stephen R. and Mahajan, Sumeet (2018) Optical fibre-tip probes for SERS: numerical study for design considerations. Optics Express, 26 (12), 15539-15550. (doi:10.1364/OE.26.015539).

Record type: Article

Abstract

Enhancement of sub-wavelength optical fields using sub-micron plasmonic probes has found many applications in chemical, material, biological and medical sciences. The enhancement is via localised surface-plasmon resonance (LSPR) which enables the highly sensitive vibrational-spectroscopy technique of surface-enhanced Raman scattering (SERS). Combining SERS with optical fibres can allow the monitoring of biochemical reactions in-situ with high resolution. Here, we study the electromagnetic-field enhancement of a tapered optical fibre-tip coated with gold nanoparticles (AuNPs) using finite-element simulations. We investigate the electric-field enhancement associated with metallic NPs and study the effect of parameters such as tip-aperture radius, cone angle, nanoparticle size and gaps between them. Our study provides an understanding for the design and application of metal-nanoparticle-coated optical-fibre-tip probes for SERS. The approach of using fibre-coupled delivery adds flexibility and simplifies the system requirements in SERS, making it suitable for cellular imaging and mapping bio-interfaces.

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Optical Express-full_Fibre_tip_revised - Accepted Manuscript
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oe-26-12-15539 - Version of Record
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More information

Accepted/In Press date: 24 April 2018
e-pub ahead of print date: 6 June 2018
Published date: 11 June 2018

Identifiers

Local EPrints ID: 421774
URI: http://eprints.soton.ac.uk/id/eprint/421774
ISSN: 1094-4087
PURE UUID: 16602eeb-27e3-4bfc-9396-c0a712712108
ORCID for Sumeet Mahajan: ORCID iD orcid.org/0000-0001-8923-6666

Catalogue record

Date deposited: 27 Jun 2018 16:30
Last modified: 22 Nov 2021 02:55

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Contributors

Author: Tanya Hutter
Author: Stephen R. Elliott
Author: Sumeet Mahajan ORCID iD

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