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Integration of nanostructures and waveguide core for surface enhanced Raman spectroscopy: a novel excitation method

Integration of nanostructures and waveguide core for surface enhanced Raman spectroscopy: a novel excitation method
Integration of nanostructures and waveguide core for surface enhanced Raman spectroscopy: a novel excitation method
Surface Enhanced Raman Spectroscopy (SERS) allows the intensity of Raman scattering to be enhanced by a factor of 106 by placing molecules within a few nm of a rough metal surface. In this paper we investigate a completely different configuration for the excitation mechanism, incorporating an optical waveguide beneath a nano-structured precious metal surface. The pyramidal geometry projects the Plasmon field into free space, thus increasing the cross section of interaction between the analyte molecules and optical fields, thereby increasing device sensitivity. In this arrangement the excitation field comes from underneath and enters the nanostructures at the base. This allows the emission to reach the discrete sensing areas effectively and provides ideal parameters for maximum Raman interactions. Using FDTD modeling methods the waveguide coupled SERS nanostructures were analyzed and its performance at different gold thicknesses was determined. The model investigates efficiency of coupling between the waveguide and surface plasmons, but also investigates spatial localization around sharp features of the geometry. Thin films of aluminum oxide and silicon oxynitride were reactively sputtered and characterized to determine their suitability as the waveguide core material. It was found that silicon oxynitride slab waveguide losses were too high to be considered as the core. The 2D and 3D simulations were based on an aluminum oxide core.
Pearce, S.
54891fdd-25ca-4768-ab4d-27f51be1e3e9
Charlton, M.D.B.
fcf86ab0-8f34-411a-b576-4f684e51e274
Pollard, M.
172acf2b-a2d9-4efb-a3d5-bc3c56b50e89
Oo, Swe Zin
6495f6da-8f17-4484-98fb-6151b4efbd9a
Chen, R.
08f4fdc2-6244-48e5-a642-cb9e2641531c
Pearce, S.
54891fdd-25ca-4768-ab4d-27f51be1e3e9
Charlton, M.D.B.
fcf86ab0-8f34-411a-b576-4f684e51e274
Pollard, M.
172acf2b-a2d9-4efb-a3d5-bc3c56b50e89
Oo, Swe Zin
6495f6da-8f17-4484-98fb-6151b4efbd9a
Chen, R.
08f4fdc2-6244-48e5-a642-cb9e2641531c

Pearce, S., Charlton, M.D.B., Pollard, M., Oo, Swe Zin and Chen, R. (2012) Integration of nanostructures and waveguide core for surface enhanced Raman spectroscopy: a novel excitation method. Photonics West 2012, San Francisco, United States. 21 - 26 Jan 2012. (doi:10.1117/12.910476).

Record type: Conference or Workshop Item (Paper)

Abstract

Surface Enhanced Raman Spectroscopy (SERS) allows the intensity of Raman scattering to be enhanced by a factor of 106 by placing molecules within a few nm of a rough metal surface. In this paper we investigate a completely different configuration for the excitation mechanism, incorporating an optical waveguide beneath a nano-structured precious metal surface. The pyramidal geometry projects the Plasmon field into free space, thus increasing the cross section of interaction between the analyte molecules and optical fields, thereby increasing device sensitivity. In this arrangement the excitation field comes from underneath and enters the nanostructures at the base. This allows the emission to reach the discrete sensing areas effectively and provides ideal parameters for maximum Raman interactions. Using FDTD modeling methods the waveguide coupled SERS nanostructures were analyzed and its performance at different gold thicknesses was determined. The model investigates efficiency of coupling between the waveguide and surface plasmons, but also investigates spatial localization around sharp features of the geometry. Thin films of aluminum oxide and silicon oxynitride were reactively sputtered and characterized to determine their suitability as the waveguide core material. It was found that silicon oxynitride slab waveguide losses were too high to be considered as the core. The 2D and 3D simulations were based on an aluminum oxide core.

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More information

Published date: 9 February 2012
Venue - Dates: Photonics West 2012, San Francisco, United States, 2012-01-21 - 2012-01-26
Organisations: Nanoelectronics and Nanotechnology

Identifiers

Local EPrints ID: 350329
URI: https://eprints.soton.ac.uk/id/eprint/350329
PURE UUID: 2cc069ef-f749-4a77-8633-2dda79bd118e

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Date deposited: 26 Mar 2013 15:04
Last modified: 27 Feb 2019 17:31

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Contributors

Author: S. Pearce
Author: M.D.B. Charlton
Author: M. Pollard
Author: Swe Zin Oo
Author: R. Chen

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