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Integrated waveguide and nanostructured sensor platform for surface-enhanced Raman spectroscopy

Integrated waveguide and nanostructured sensor platform for surface-enhanced Raman spectroscopy
Integrated waveguide and nanostructured sensor platform for surface-enhanced Raman spectroscopy
Limitations of current sensors include large dimensions, sometimes limited sensitivity and inherent single-parameter measurement capability. Surface-enhanced Raman spectroscopy can be utilized for environment and pharmaceutical applications with the intensity of the Raman scattering enhanced by a factor of 106. By fabricating and characterizing an integrated optical waveguide beneath a nanostructured precious metal coated surface a new surface-enhanced Raman spectroscopy sensing arrangement can be achieved. Nanostructured sensors can provide both multiparameter and high-resolution sensing. Using the slab waveguide core to interrogate the nanostructures at the base allows for the emission to reach discrete sensing areas effectively and should provide ideal parameters for maximum Raman interactions. Thin slab waveguide films of silicon oxynitride were etched and gold coated to create localized nanostructured sensing areas of various pitch, diameter, and shape. These were interrogated using a Ti:Sapphire laser tuned to 785-nm end coupled into the slab waveguide. The nanostructured sensors vertically projected a Raman signal, which was used to actively detect a thin layer of benzyl mercaptan attached to the sensors.
1934-2608
83989
Pearce, S.
54891fdd-25ca-4768-ab4d-27f51be1e3e9
Pollard, M.
172acf2b-a2d9-4efb-a3d5-bc3c56b50e89
Oo, Swe Zin
6495f6da-8f17-4484-98fb-6151b4efbd9a
Chen, R.
a4296b4e-7693-4e5f-b3d5-27b617bb9d67
Kalsi, S.
e5a6be0f-5060-4bce-a272-4faa34f01cd1
Charlton, M.D.B
388d72a8-13be-4bf7-8291-52d7a51d3c3d
Pearce, S.
54891fdd-25ca-4768-ab4d-27f51be1e3e9
Pollard, M.
172acf2b-a2d9-4efb-a3d5-bc3c56b50e89
Oo, Swe Zin
6495f6da-8f17-4484-98fb-6151b4efbd9a
Chen, R.
a4296b4e-7693-4e5f-b3d5-27b617bb9d67
Kalsi, S.
e5a6be0f-5060-4bce-a272-4faa34f01cd1
Charlton, M.D.B
388d72a8-13be-4bf7-8291-52d7a51d3c3d

Pearce, S., Pollard, M., Oo, Swe Zin, Chen, R., Kalsi, S. and Charlton, M.D.B (2014) Integrated waveguide and nanostructured sensor platform for surface-enhanced Raman spectroscopy. Journal of Nanophotonics, 8 (1), 83989. (doi:10.1117/1.JNP.8.083989).

Record type: Article

Abstract

Limitations of current sensors include large dimensions, sometimes limited sensitivity and inherent single-parameter measurement capability. Surface-enhanced Raman spectroscopy can be utilized for environment and pharmaceutical applications with the intensity of the Raman scattering enhanced by a factor of 106. By fabricating and characterizing an integrated optical waveguide beneath a nanostructured precious metal coated surface a new surface-enhanced Raman spectroscopy sensing arrangement can be achieved. Nanostructured sensors can provide both multiparameter and high-resolution sensing. Using the slab waveguide core to interrogate the nanostructures at the base allows for the emission to reach discrete sensing areas effectively and should provide ideal parameters for maximum Raman interactions. Thin slab waveguide films of silicon oxynitride were etched and gold coated to create localized nanostructured sensing areas of various pitch, diameter, and shape. These were interrogated using a Ti:Sapphire laser tuned to 785-nm end coupled into the slab waveguide. The nanostructured sensors vertically projected a Raman signal, which was used to actively detect a thin layer of benzyl mercaptan attached to the sensors.

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More information

Accepted/In Press date: 20 March 2014
Published date: 11 April 2014
Organisations: Nanoelectronics and Nanotechnology

Identifiers

Local EPrints ID: 370437
URI: https://eprints.soton.ac.uk/id/eprint/370437
ISSN: 1934-2608
PURE UUID: fa9a2f6e-aaef-4d69-8158-9a811a9a0684

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Date deposited: 29 Oct 2014 12:25
Last modified: 19 Jul 2019 20:59

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