Fano resonance boosted cascaded optical field enhancement in a plasmonic nanoparticle-in-cavity nanoantenna array and its SERS application

Zhendong Zhu; Benfeng Bai; Oubo You; Qunqing Li; Shoushan Fan

doi:10.1038/lsa.2015.69

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Fano resonance boosted cascaded optical field enhancement in a plasmonic nanoparticle-in-cavity nanoantenna array and its SERS application

Original Articles

- Fano resonance boosted cascaded optical field enhancement in a plasmonic nanoparticle-in-cavity nanoantenna array and its SERS application
- Light: Science & Applications Vol. 4, Issue 3, (2015)
- Affiliations：
  
  1.State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
  2.TsinghuaFoxconn Nanotechnology Research Center, Department of Physics, Tsinghua University, Beijing 100084, China
- Author bio：
  
  Dr Benfeng Bai, Department of Precision Instrument, Tsinghua University, Beijing 100084, China E-mail: baibenfeng@mail.tsinghua.edu.cn
- Funds：
- DOI：10.1038/lsa.2015.69
  CLC：
- Published：2015-09，
  
  Published Online：07 March 2015，
  
  Received：10 November 2014，
  
  Revised：10 February 2015，
  
  Accepted：03 March 2015
- Accepted：
Scan QR Code
Zhu, Z. D. et al. Fano resonance boosted cascaded optical field enhancement in a plasmonic nanoparticle-in-cavity nanoantenna array and its SERS application. Light: Science & Applications, 4, e296 (2015).
DOI：

Zhu, Z. D. et al. Fano resonance boosted cascaded optical field enhancement in a plasmonic nanoparticle-in-cavity nanoantenna array and its SERS application. Light: Science & Applications, 4, e296 (2015). DOI： 10.1038/lsa.2015.69.

摘要

Abstract

Cascaded optical field enhancement (CFE) can be realized in some specially designed multiscale plasmonic nanostructures

in which the generation of extremely strong fields at nanoscale volume is crucial for many applications

for example

surface-enhanced Raman spectroscopy (SERS). In this paper

we propose a strategy for realizing a high-quality plasmonic nanoparticle-in-cavity (PIC) nanoantenna array

in which strong coupling between a nanoparticle (NP) dark mode with a high-order nanocavity bright mode can produce strong Fano resonance at the target wavelength. The Fano resonance can effectively boost the CFE in a PIC. A cost-effective and reliable nanofabrication method is developed using room temperature nanoimprinting lithography to manufacture high-quality PIC arrays. This technique guarantees the generation of only one gold NP at the bottom of each nanocavity

which is crucial for the generation of the expected CFE. To demonstrate the performance and application of the PIC array

the PIC array is employed as an

active SERS substrate for detecting 4-aminothiophenol molecules. An experimental SERS enhancement factor of 2 × 10

is obtained

which verifies the field enhancement and the potential of this device.

关键词

Keywords

cascaded optical field enhancementFano resonancelocalized surface plasmonplasmonic nanoantennasurface-enhanced Raman spectroscopy

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