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Randomization of gold nano-brick arrays: a tool for SERS enhancement

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Title: Randomization of gold nano-brick arrays: a tool for SERS enhancement
Authors: Nishijima, Yoshiaki Browse this author
Khurgin, Jacob B. Browse this author
Rosa, Lorenzo Browse this author
Fujiwara, Hideki Browse this author →KAKEN DB
Juodkazis, Saulius Browse this author →KAKEN DB
Issue Date: 3-Jun-2013
Publisher: Optical Society of America
Journal Title: Optics Express
Volume: 21
Issue: 11
Start Page: 13502
End Page: 13514
Publisher DOI: 10.1364/OE.21.013502
Abstract: 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 ∼ 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.
Rights: © 2013 Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.
Type: article
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 藤原 英樹

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