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Research Article

Silver-coated elevated bowtie nanoantenna arrays: Improving the near-field enhancement of gap cavities for highly active surface-enhanced Raman scattering

Lei Feng§, Renping Ma§, Yandong Wang, Daren Xu, Dongyang Xiao, Lingxiao Liu, Nan Lu( )
State Key Laboratory of Supramolecular Structure and MaterialsJilin UniversityChangchun130012China

§ These authors contributed equally to this work.

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Abstract

Improving hot-spot intensity is a key issue in surface-enhanced Raman scattering (SERS). The bowtie nanoantenna (BNA) is an effective device used to concentrate light energy into a nanoscale volume and produce strong hot spots. Nanosphere lithography (NSL) is a large-area and low-cost technique to produce BNA arrays; however, the SERS activity of NSL-fabricated BNAs is limited. In this paper, we present a simple method to improve the SERS activity of conventional NSL-fabricated BNAs by modifying their geometry. The new configuration is termed "silver-coated elevated bowtie nanoantenna" (SCEBNA). SCEBNAs perform intensive near-field enhancement in the gap cavities owing to the integrated contribution of the "lightning rod" effect, resonance coupling, and the formation of the plasmonic Fabry–Pérot cavity. Experimental measurements and finite-difference time-domain simulations revealed that the hot-spot intensity and the substrate enhancement factor can be optimized by adjusting the silver thickness. The optimal sample has the capability of trace-amount detection with fine reproducibility.

Keywords

surface-enhanced Raman scattering (SERS)surface plasmon resonancebowtie nanoantennananosphere lithographygap cavity

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Nano Research
Volume 8 Issue 11,
November 2015
Pages 3715-3724
DOI: 10.1007/s12274-015-0871-2
Cite this article:
Feng L, Ma R, Wang Y, et al. Silver-coated elevated bowtie nanoantenna arrays: Improving the near-field enhancement of gap cavities for highly active surface-enhanced Raman scattering. Nano Research, 2015, 8(11): 3715-3724. https://doi.org/10.1007/s12274-015-0871-2

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Received: 16 March 2015
Revised: 25 July 2015
Accepted: 30 July 2015
Published: 25 September 2015
© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2015
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