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Title

Light enhancement in surface-enhanced Raman scattering at oblique incidence

Author(s)

Jayawardhana, Sasani;  Rosa, Lorenzo;  Buividas, Ricardas;  Stoddart, Paul;  Juodkazis, Saulius

Abstract

Surface enhanced Raman scattering (SERS) measurements have been carried out at different focusing conditions using objective lenses of different numerical apertures. The experimentally observed dependence of SERS intensity of thiophenol-coated Ag nano-islands shows a close-to-linear scaling with the collection aperture. The linear relationship breaks down for large numerical apertures, which suggests that the scattering is anisotropic. Numerical simulations of realistically shaped Ag nano-islands were carried out, and the spatial distribution of hot-spots has been revealed at different heights near the nano-islands. Local field enhancements of up to 100 times were estimated. The simulation also suggests an explanation for the anisotropy in the scattering observed for larger numerical aperture objectives. This appears to be due to a reduction in the local field enhancement as the electric field vector component in the plane of the shallow metal islands reduces at larger angles of incidence.

Publication type

Journal article

Research centre

Swinburne University of Technology. Faculty of Engineering and Industrial Sciences. Centre for Atom Optics and Ultrafast Spectroscopy

Research centre

Swinburne University of Technology. Faculty of Engineering and Industrial Sciences. Centre for Micro-Photonics

Source

Photonic Sensors, Vol. 2, no. 3 (Sep 2012), pp. 283-288

Publication year

2012

Keyword(s)

Finite difference time domain;  Metal island films;  Surface-enhanced Raman scattering

Publisher

Springer

ISSN

1674-9251

Publisher URL

http://dx.doi.org/10.1007/s13320-012-0073-4

Copyright

Copyright © The Author(s) 2012. This article is published with open access at Springerlink.com. This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author(s) and source are credited. The published version is reproduced in accordance with this policy.

Research Projects

Opto-microfluidics: a rapid and sensitive platform for biological diagnostics, Australian Research Council grant number DP1092955
Ultra-fast alchemy: a new strategy to synthesise super-dense nanomaterials, Australian Research Council grant number DP120102980

Full text

Peer reviewed