Research Article

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2017, 10(9): 2934–2943

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https://doi.org/10.1007/s12274-017-1503-9

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

Zhendong Zhu1,2,3,§, Qixia Wang2,§, Fa Zeng2,4, Oubo You2, Sitian Gao1 (*), Benfeng Bai2, Qiaofeng Tan2 (*), Guofan Jin2, Qunqing Li3 (*), Shoushan Fan3, Wei Li1, Yushu Shi1, and Xueshen Wang1

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1 Division of Nano Metrology and Materials Measurement, National Institute of Metrology, Beijing 100028, China
2 State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China
3 Tsinghua–Foxconn Nanotechnology Research Center, Tsinghua University, Beijing 100084, China
4 Laser Fusion Research Center, China Academic of Engineering Physics, Sichuan 621900, China
§ Zhendong Zhu and Qixia Wang contributed equally to this work.

Keywords: surface plasmons, mode hybridization, positioning hotspot, double-stacked nanocone (DSC) nanostructure, surface-enhanced Raman scattering (SERS)
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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.
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Active coherent control of nanoscale light confinement: Modulation of plasmonic modes and position of hotspots for surface-enhanced Raman scattering detection. Nano Res. 2017, 10(9): 2934–2943 https://doi.org/10.1007/s12274-017-1503-9

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