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Title: Fluctuation in surface enhanced Raman scattering intensity due to plasmon related heating effect
Authors: Soudamini, D.U.
Fu, C.Y.
Kho, K.W.
Thoniyot, P.
Agarwal, A.
Olivo, M. 
Keywords: Bi-metallic SERS substrates
Plasmonic heating
Raman Scattering
Surface Enhanced
Issue Date: 2009
Citation: Soudamini, D.U.,Fu, C.Y.,Kho, K.W.,Thoniyot, P.,Agarwal, A.,Olivo, M. (2009). Fluctuation in surface enhanced Raman scattering intensity due to plasmon related heating effect. Proceedings of SPIE - The International Society for Optical Engineering 7394 : -. ScholarBank@NUS Repository.
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. © 2009 SPIE.
Source Title: Proceedings of SPIE - The International Society for Optical Engineering
ISBN: 9780819476845
ISSN: 0277786X
DOI: 10.1117/12.827234
Appears in Collections:Staff Publications

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