Abstract
Microwave metasurfaces comprising overlapping layers of circular patches arranged in a hexagonal array are found to support edge modes akin to edge plasmons. The coupling of these edge modes across small gaps between two such arrays is explored. This phenomenon, well known at optical frequencies, is verified here for the first time, to the best of our knowledge, at microwave frequencies.
Highlights
Localized electromagnetic surface waves can propagate at the interface between a conductor and an insulator
This results in an edge mode at much higher frequency which was not observed in the experiments as being distinct from the light line
The number of supported surface modes is dictated by the number of metaatoms in the transverse direction that comprise the structure [16]
Summary
Localized electromagnetic surface waves can propagate at the interface between a conductor and an insulator. At visible frequencies they are known as surface plasmons and have widely been studied since the 1950s, e.g., [1]. When a surface pattern on a scale-length similar or smaller than the excitation wavelength is introduced, a mode similar in dispersion to a surface plasmon is found. This concept has been known since the mid-twentieth century [2, 3], and was readdressed theoretically and experimentally [4, 5] more recently. Pendry et al [4] showed that the dispersion of the modes supported on perfect conductors perforated with an array of subwavelength holes
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