Backward spoof surface wave in plasmonic metamaterial of ultrathin metallic structure.

Abstract:

:Backward wave with anti-parallel phase and group velocities is one of the basic properties associated with negative refraction and sub-diffraction image that have attracted considerable interest in the context of photonic metamaterials. It has been predicted theoretically that some plasmonic structures can also support backward wave propagation of surface plasmon polaritons (SPPs), however direct experimental demonstration has not been reported, to the best of our knowledge. In this paper, a specially designed plasmonic metamaterial of corrugated metallic strip has been proposed that can support backward spoof SPP wave propagation. The dispersion analysis, the full electromagnetic field simulation and the transmission measurement of the plasmonic metamaterial waveguide have clearly validated the backward wave propagation with dispersion relation possessing negative slope and opposite directions of group and phase velocities. As a further verification and application, a contra-directional coupler is designed and tested that can route the microwave signal to opposite terminals at different operating frequencies, indicating new application opportunities of plasmonic metamaterial in integrated functional devices and circuits for microwave and terahertz radiation.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Liu X,Feng Y,Zhu B,Zhao J,Jiang T

doi

10.1038/srep20448

subject

Has Abstract

pub_date

2016-02-04 00:00:00

pages

20448

issn

2045-2322

pii

srep20448

journal_volume

6

pub_type

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