Nano Research

, Volume 10, Issue 9, pp 2934–2943 | Cite as

Active coherent control of nanoscale light confinement: Modulation of plasmonic modes and position of hotspots for surface-enhanced Raman scattering detection

Research Article

Abstract

Multistep plasmonic nanostructures can induce the deep modulation of electromagnetic-field interactions on the nanoscale for positioning hotspots, and this generation of enhanced fields is important in many optical applications. In this article, a new strategy is proposed for fabricating a plasmonic doublestacked nanocone (DSC) nanostructure. In the DSC structure, a tunable plasmonic hybrid mode proceeds from the strong coupling of the plasmonic resonance of a fundamental cavity mode with a localized surface plasmon gap mode. In the nanostructure, the far-field response is deeply modulated and the hottest spots can be effectively positioned on the top surface of the DSC nanostructure. A controllable and cost-effective mask-reconfiguration technique for manufacturing the multiscale nanostructure is developed, which guarantees the generation of the introduced crucial stage on the DSC nanostructure. To evaluate the features of the plasmonic resonance, the DSC nanostructure is used as a surface-enhanced Raman scattering (SERS) substrate for detecting 4-mercaptopyridine molecules under specific excitation conditions. Its good performance, with an average measured SERS enhancement factor as high as 108, demonstrates its strong plasmonic-mode hybridization and extreme field enhancement.

Keywords

surface plasmons mode hybridization positioning hotspot double-stacked nanocone (DSC) nanostructure surface-enhanced Raman scattering (SERS) 

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Copyright information

© Tsinghua University Press and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Zhendong Zhu
    • 1
    • 2
    • 3
  • Qixia Wang
    • 2
  • Fa Zeng
    • 2
    • 4
  • Oubo You
    • 2
  • Sitian Gao
    • 1
  • Benfeng Bai
    • 2
  • Qiaofeng Tan
    • 2
  • Guofan Jin
    • 2
  • Qunqing Li
    • 3
  • Shoushan Fan
    • 3
  • Wei Li
    • 1
  • Yushu Shi
    • 1
  • Xueshen Wang
    • 1
  1. 1.Division of Nano Metrology and Materials MeasurementNational Institute of MetrologyBeijingChina
  2. 2.State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision InstrumentTsinghua UniversityBeijingChina
  3. 3.Tsinghua–Foxconn Nanotechnology Research CenterTsinghua UniversityBeijingChina
  4. 4.Laser Fusion Research CenterChina Academic of Engineering PhysicsMianyangChina

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