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Tale of Two Resonances: Waveguide–Plasmon Coupling and High Q-Factor Engineering on the Nanoscale

  • Yang Fu
    Yang Fu
    Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR999077, China
    More by Yang Fu
  • Ye Ming Qing
    Ye Ming Qing
    Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR999077, China
    More by Ye Ming Qing
  • Zhiyong Li
    Zhiyong Li
    Department of Electronic Engineering and Materials Science and Technology Research Center, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong SAR999077, China
    More by Zhiyong Li
  • Anatoly V. Zayats
    Anatoly V. Zayats
    Department of Physics and London Centre for Nanotechnology, King’s College London, Strand, LondonWC2R 2LS, United Kingdom
  • , and 
  • Dangyuan Lei*
    Dangyuan Lei
    Department of Materials Science and Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon, Hong Kong SAR999077, China
    *E-mail: [email protected]
    More by Dangyuan Lei
Cite this: ACS Photonics 2023, 10, 1, 2–12
Publication Date (Web):December 5, 2022
https://doi.org/10.1021/acsphotonics.2c01271
Copyright © 2022 American Chemical Society

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    Abstract

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    Localized surface plasmon (LSP) excitations provide an efficient strategy for advancing nanophotonic designs and applications where strong field enhancement and confinement are often required on the nanoscale. They represent an important plasmonic paradigm for achieving strong light–matter interactions in both linear and nonlinear regimes, enabling the development of high-performance chemical and biological sensing approaches and nonlinear optics with low light intensities. However, the LSP resonance line width, limited by both radiative and resistive losses of metallic nanostructures, is significantly larger than the line width of the waveguided modes supported by low-loss dielectric microcavities with a significantly lower field confinement. Hybrid microcavity–plasmonic systems are, therefore, often used to reduce the resonant line width which improves the detection spectral resolution while maintaining strong confinement. Employing the remarkable quality factors of whispering gallery mode (WGM) microresonators, the hybrid LSP-WGM systems demonstrate sensing capabilities down to the single-molecule level. In this Perspective, we review the recent advances in the hybridization of LSPs and WGMs, focusing on the fundamental understanding of the underlying coupling mechanisms and corresponding mode hybridization regimes. We further discuss opportunities for applying heterogeneous plasmonic–photonic integration to tailor the nanoscale light–matter interactions and realize novel waveguide–plasmon coupling based nontrivial responses and highlight their prospective applications in quantum optics, chiral spin-optics, nonlinear nanophotonics, and sensing.

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    Cited By

    This article is cited by 1 publications.

    1. Yiru Wang, Qingzhang You, Ze Li, Lisheng Zhang, Duan Zhang, Peijie Wang. Strong Coupling of Plasmonic Nanorods with a MoSe2 Monolayer in the Near-Infrared Shortwave Region. The Journal of Physical Chemistry C 2024, 128 (12) , 5280-5287. https://doi.org/10.1021/acs.jpcc.3c07873

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