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  • Received: Jul. 30, 2020

    Accepted: Sep. 29, 2020

    Posted: Oct. 1, 2020

    Published Online: Nov. 17, 2020

    The Author Email: Shuping Xu (xusp@jlu.edu.cn)

    DOI: 10.1364/PRJ.404092

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    Yu Tian, Hailong Wang, Yijia Geng, Lili Cong, Yu Liu, Weiqing Xu, Shuping Xu. Boosting a sub-10 nm nanogap array by plasmon-triggered waveguide resonance[J]. Photonics Research, 2020, 8(12): 12001850

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Photonics Research, Vol. 8, Issue 12, 12001850 (2020)

Boosting a sub-10 nm nanogap array by plasmon-triggered waveguide resonance

Yu Tian1, Hailong Wang1, Yijia Geng2, Lili Cong1, Yu Liu2, Weiqing Xu1, and Shuping Xu1,*

Author Affiliations

  • 1State Key Laboratory of Supramolecular Structure and Materials, Institute of Theoretical Chemistry, College of Chemistry, Jilin University, Changchun 130012, China
  • 2State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China

Abstract

Gap-type metallic nanostructures are widely used in catalytic reactions, sensors, and photonics because the hotspot effect on these nanostructures supports giant local electromagnetic field enhancement. To achieve hotspots, researchers devote themselves to reducing gap distances, even to 1 nm. However, current techniques to fabricate such narrow gaps in large areas are still challenging. Herein, a new coupling way to boost the sub-10 nm plasmonic nanogap array is developed, based on the plasmon-triggered optical waveguide resonance via near-field coupling. This effect leads to an amplified local electromagnetic field within the gap regions equivalent to narrower gaps, which is evidenced experimentally by the surface-enhanced Raman scattering intensity of probed molecules located in the gap and the finite-difference time-domain numerical simulation results. This study provides a universal strategy to promote the performance of the existing hotspot configurations without changing their geometries.

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