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Proceedings Paper

Nonlinear response of 2D plasmonic gold patches for SERS applications
Author(s): M. Grande; V. Petruzzelli; A. D'Orazio; M. A. Vincenti; D. de Ceglia; G. V. Bianco; G. Bruno; T. Stomeo; M. De Vittorio; M. Scalora
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Paper Abstract

In this paper we describe the fabrication of a periodic, two-dimensional arrangement of gold square patches on a Silicon substrate, and highlight technological limitations due to the roughness of the metal layer. Scanning Electron Microscope (SEM) and Atomic Force Microscope analyses are also reported showing that the geometrical parameters obtained are almost identical to the nominal parameters of the simulated structure. The device is functionalized by means of a conjugated rigid thiol forming a very dense, closely packed, reproducible 18 Å–thick, self-assembled monolayer. The nonlinear response of the 2D array is characterized by means of a micro-Raman spectrometer and it is compared with a conventional plasmonic platform consisting of a gold nano-particles ensemble on Silicon substrate, revealing a dramatic improvement in the Raman signal. The SERS response is empirically investigated using a laser source operating in the visible range at 633 nm. SERS mapping and estimation of the provided SERS enhancement factor (EF) are carried out to evaluate their effectiveness, stability and reproducibility as SERS substrate. Moreover, we take advantage of the simple geometry of this 2D array to investigate the dependence of the SERS response on the number of total illuminated nano-patches.

Paper Details

Date Published: 9 October 2012
PDF: 7 pages
Proc. SPIE 8457, Plasmonics: Metallic Nanostructures and Their Optical Properties X, 845727 (9 October 2012); doi: 10.1117/12.929474
Show Author Affiliations
M. Grande, Politecnico di Bari (Italy)
V. Petruzzelli, Politecnico di Bari (Italy)
A. D'Orazio, Politecnico di Bari (Italy)
M. A. Vincenti, The AEgis Technologies Group, Inc. (United States)
D. de Ceglia, The AEgis Technologies Group, Inc. (United States)
G. V. Bianco, Istituto di Metodologie Inorganiche e Dei Plasmi, CNR (Italy)
G. Bruno, Istituto di Metodologie Inorganiche e Dei Plasmi, CNR (Italy)
T. Stomeo, Istituto Italiano di Tecnologia (Italy)
M. De Vittorio, Istituto Italiano di Tecnologia (Italy)
National Nanotechnology Lab., CNR, Univ. Del Salento (Italy)
M. Scalora, U.S. Army Aviation and Missile Command (United States)

Published in SPIE Proceedings Vol. 8457:
Plasmonics: Metallic Nanostructures and Their Optical Properties X
Mark I. Stockman, Editor(s)

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