Ultra-Low-Loss High-Contrast Gratings Based Spoof Surface Plasmonic Waveguide

Liangliang Liu, Zhuo Li, Bingzheng Xu, Changqing Gu, Xinlei Chen, Hengyi Sun, Yongjin Zhou, Quan Qing, Ping Shum, Yu Luo

    Research output: Contribution to journalArticle

    18 Citations (Scopus)

    Abstract

    Large metallic losses and short propagation lengths associated with surface plasmons (SPs) have long been considered as the obstacles which severely limit the practical applications of surface plasmonic waveguides. In this paper, we introduce the concept of dielectric spoof SPs (SSPs) and show that subwavelength high-contrast gratings (HCGs) offer a route to effectively suppress the losses and hence dramatically increase the propagation length of surface electromagnetic waves. We experimentally realized a wideband ultra-low-loss high-confinement plasmonic waveguide constructed by a high refractive-index dielectric array with deep-subwavelength periodicity on a metal substrate. Simulation and measurement results on the near-field distributions and S-parameters at microwave frequencies provide explicit evidences of strong field localization and show excellent transmission efficiency of HCGs-based SSPs across a broad frequency band. More importantly, the propagation length of the HCGs-based SSPs is proved to be at least more than one order of magnitude larger than that of metallic gratings-based SSPs at the same or even higher level of field confinement. Thus, the SSPs as experimentally realized in this paper hold great promise for numerous practical applications in ultra-low-loss and long-range transmission SP devices and circuits and may open up new vistas in SP optics.

    Original languageEnglish (US)
    JournalIEEE Transactions on Microwave Theory and Techniques
    DOIs
    StateAccepted/In press - Feb 20 2017

    Fingerprint

    Plasmons
    Waveguides
    plasmons
    gratings
    waveguides
    propagation
    electromagnetic surface waves
    transmission efficiency
    Microwave frequencies
    Scattering parameters
    microwave frequencies
    Electromagnetic waves
    Surface waves
    Wave propagation
    Frequency bands
    periodic variations
    Optics
    Refractive index
    near fields
    routes

    ASJC Scopus subject areas

    • Radiation
    • Condensed Matter Physics
    • Electrical and Electronic Engineering

    Cite this

    Ultra-Low-Loss High-Contrast Gratings Based Spoof Surface Plasmonic Waveguide. / Liu, Liangliang; Li, Zhuo; Xu, Bingzheng; Gu, Changqing; Chen, Xinlei; Sun, Hengyi; Zhou, Yongjin; Qing, Quan; Shum, Ping; Luo, Yu.

    In: IEEE Transactions on Microwave Theory and Techniques, 20.02.2017.

    Research output: Contribution to journalArticle

    Liu, Liangliang ; Li, Zhuo ; Xu, Bingzheng ; Gu, Changqing ; Chen, Xinlei ; Sun, Hengyi ; Zhou, Yongjin ; Qing, Quan ; Shum, Ping ; Luo, Yu. / Ultra-Low-Loss High-Contrast Gratings Based Spoof Surface Plasmonic Waveguide. In: IEEE Transactions on Microwave Theory and Techniques. 2017.
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    AU - Chen, Xinlei

    AU - Sun, Hengyi

    AU - Zhou, Yongjin

    AU - Qing, Quan

    AU - Shum, Ping

    AU - Luo, Yu

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