Abstract
Spoof surface plasmon polaritons (SPPs) are highly localized surface waves that can be supported on metal surfaces with subwavelength decorations. Mode matching and momentum matching have been investigated so as to efficiently excite the spoof SPPs through conventional planar waveguides (WGs) such as the microstrip (MS) line and the co-planar waveguide (CPW). In this work, a smooth and wideband bridge between the conventional rectangular waveguide and the plasmonic waveguide of spoof SPPs has been proposed and experimentally demonstrated. High efficiency is achieved in both simulation and experiment in a wide frequency range from 12 to 18 GHz. The high-efficiency and broadband excitation of spoof SPPs through rectangular waveguide has great potentials in microwave, millimeter-wave and terahertz circuits and systems.
Highlights
INTRODUCTIONSurface plasmon polaritons (SPPs) exist on the interface of two media (e.g., metal and the air) with opposite permittivities at optical frequencies [1]
Surface plasmon polaritons (SPPs) exist on the interface of two media with opposite permittivities at optical frequencies [1]
High-efficiency transition between the rectangular waveguide and the spoof surface plasmon polaritons (SPPs) TL is significant for plasmonic circuits in microwave, millimeter wave, and even Terahertz
Summary
Surface plasmon polaritons (SPPs) exist on the interface of two media (e.g., metal and the air) with opposite permittivities at optical frequencies [1]. The SPPs possess some inherent characteristics such as strong confinement of EM field and sub-wavelength resolution, and have been developed in surface plasmon-based circuits for the purpose of biosensing, microscopy, extraordinary optical transmissions, near-field optics, etc. At lower frequencies such as terahertz and microwave, metals behave close to perfectly electric conductors (PECs) rather than plasmas Due to this fact, “spoof ” (or “designer”) surface plasmon polaritons, which could be considered as one special type of metamaterials, have been created below the far-infrared frequency so as to obtain the SPP-like dispersion and propagation properties. High-efficiency transition between the rectangular waveguide and the spoof SPP TL is significant for plasmonic circuits in microwave, millimeter wave, and even Terahertz. This kind of excitation could be adopted in plasmonic circuits at millimeter wave and Terahertz
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