Journal
OPTICS EXPRESS
Volume 21, Issue 11, Pages 13502-13514Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.21.013502
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Funding
- Research Foundation for Opt-Science and Technology
- Australian Research Council [DP130101205]
- Grants-in-Aid for Scientific Research [24651111] Funding Source: KAKEN
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Surface enhanced Raman scattering (SERS) was measured on periodic and randomly arranged patterns of Au nano-bricks (rectangular parallelepipeds). Resonant SERS conditions were investigated of a near-IR dye deposited on nanoparticles. Random mixtures of Au nano-bricks with different aspect ratio R showed stronger SERS enhancement as compared to periodic patterns with constant aspect ratio (R varies from 1 to 4). SERS mapping revealed up to similar to 4 times signal increase at the hot-spots. Experimental observation is verified by numerical modeling and is qualitatively consistent with generic scaling arguments of interaction between plasmonic nanoparticles. The effect of randomization on the polarization selectivity for the transverse and longitudinal modes of nano-bricks is shown. (C) 2013 Optical Society of America
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