Special Section on Nanostructured Thin Films: Latest Developments in Theory and Practice

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

[+] Author Affiliations
Stuart J. Pearce

University of Southampton, Electronics and Computer Science, Southampton, SO171BJ, United Kingdom

Michael E. Pollard

University of Southampton, Electronics and Computer Science, Southampton, SO171BJ, United Kingdom

SweZin Oo

University of Southampton, Electronics and Computer Science, Southampton, SO171BJ, United Kingdom

Ruiqi Chen

University of Southampton, Electronics and Computer Science, Southampton, SO171BJ, United Kingdom

Sumit Kalsi

University of Southampton, Electronics and Computer Science, Southampton, SO171BJ, United Kingdom

Martin D. B. Charlton

University of Southampton, Electronics and Computer Science, Southampton, SO171BJ, United Kingdom

J. Nanophoton. 8(1), 083989 (Apr 11, 2014). doi:10.1117/1.JNP.8.083989
History: Received October 29, 2013; Revised March 19, 2014; Accepted March 20, 2014
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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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© 2014 Society of Photo-Optical Instrumentation Engineers

Citation

Stuart J. Pearce ; Michael E. Pollard ; SweZin Oo ; Ruiqi Chen ; Sumit Kalsi, et al.
"Integrated waveguide and nanostructured sensor platform for surface-enhanced Raman spectroscopy", J. Nanophoton. 8(1), 083989 (Apr 11, 2014). ; http://dx.doi.org/10.1117/1.JNP.8.083989


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