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Virtual Journal for Biomedical Optics

Virtual Journal for Biomedical Optics

| EXPLORING THE INTERFACE OF LIGHT AND BIOMEDICINE

  • Editors: Andrew Dunn and Anthony Durkin
  • Vol. 8, Iss. 7 — Aug. 1, 2013

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

Yoshiaki Nishijima, Jacob B. Khurgin, Lorenzo Rosa, Hideki Fujiwara, and Saulius Juodkazis  »View Author Affiliations


Optics Express, Vol. 21, Issue 11, pp. 13502-13514 (2013)
http://dx.doi.org/10.1364/OE.21.013502


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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.

© 2013 osa

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(290.4210) Scattering : Multiple scattering
(160.4236) Materials : Nanomaterials
(220.4241) Optical design and fabrication : Nanostructure fabrication
(250.5403) Optoelectronics : Plasmonics
(310.6628) Thin films : Subwavelength structures, nanostructures

ToC Category:
Optics at Surfaces

History
Original Manuscript: March 26, 2013
Revised Manuscript: May 17, 2013
Manuscript Accepted: May 19, 2013
Published: May 29, 2013

Virtual Issues
Vol. 8, Iss. 7 Virtual Journal for Biomedical Optics

Citation
Yoshiaki Nishijima, Jacob B. Khurgin, Lorenzo Rosa, Hideki Fujiwara, and Saulius Juodkazis, "Randomization of gold nano-brick arrays: a tool for SERS enhancement," Opt. Express 21, 13502-13514 (2013)
http://www.opticsinfobase.org/vjbo/abstract.cfm?URI=oe-21-11-13502


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