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Proceedings Paper

Fluctuation in surface enhanced Raman scattering intensity due to plasmon related heating effect
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Paper Abstract

Temporal changes in signal intensity of Surface Enhanced Raman Scattering (SERS) upon laser excitation is an interesting phenomenon in plasmonics. In-depth understanding of the phenomena is highly important especially when developing a SERS sensor based on the intensity variation of particular Raman peak/band. One of the main challenges in such a technique is the intensity reduction at a given location upon consecutive measurements. Previously, signal loss in SERS measurement was attributed to the electric-field induced roughness relaxations in the SERS active surface. In such cases, as the surface is smoothened out, signals are completely lost. In our observation, the reduction in the spectral intensity is irreversible but never completely lost and a major part of it can be attributed to the plasmon induced heating effect. Here, we experimentally demonstrate this effect by studying the SERS signal from four different Raman active molecules adsorbed onto substrates that contain uniform nano-roughened bi-metallic silver/gold coating. Possible mechanism that leads to irreversible signal loss is explained. Moreover, solutions for minimising such plasmonic heating when developing a biosensor are also discussed.

Paper Details

Date Published: 3 September 2009
PDF: 9 pages
Proc. SPIE 7394, Plasmonics: Metallic Nanostructures and Their Optical Properties VII, 73940T (3 September 2009); doi: 10.1117/12.827234
Show Author Affiliations
Dinish U. Soudamini, A*STAR- Agency for Science Technology and Research (Singapore)
Chit Yaw Fu, A*STAR- Agency for Science Technology and Research (Singapore)
Kiang Wei Kho, National Cancer Ctr. of Singapore (Singapore)
Praveen Thoniyot, A*STAR- Agency for Science Technology and Research (Singapore)
Ajay Agarwal, A*STAR- Agency for Science Technology and Research (Singapore)
Malini Olivo, A*STAR- Agency for Science Technology and Research (Singapore)
National Cancer Ctr. of Singapore (Singapore)
National Univ. of Singapore (Singapore)


Published in SPIE Proceedings Vol. 7394:
Plasmonics: Metallic Nanostructures and Their Optical Properties VII
Mark I. Stockman, Editor(s)

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