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

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• 作者：Lei Feng ; Renping Ma ; Yandong Wang ; Daren Xu ; Dongyang Xiao ; Lingxiao Liu…
• 关键词：surface ; enhanced Raman scattering (SERS) ; surface plasmon resonance ; bowtie nanoantenna ; nanosphere lithography ; gap cavity
• 刊名：Nano Research
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：8
• 期：11
• 页码：3715-3724
• 全文大小：2,393 KB
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• 作者单位：Lei Feng (1)
  Renping Ma (1)
  Yandong Wang (1)
  Daren Xu (1)
  Dongyang Xiao (1)
  Lingxiao Liu (1)
  Nan Lu (1)
  
  1. State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun, 130012, China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chinese Library of Science
  Chemistry
  Nanotechnology
  
• 出版者：Tsinghua University Press, co-published with Springer-Verlag GmbH
• ISSN：1998-0000

文摘

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.