Abstract
Artificial sheet materials, known as MetaSurfaces, have been applied to fully control both space and surface waves due to their exceptional abilities to dynamically tailor wave fronts and polarization states, while maintaining small footprints. However, previous and current designs and manufactured MetaSurfaces are limited to specific types of surfaces. There exists no general but rigorous design methodology for MetaSurfaces with generic curvature. The aim of this paper is to develop an analytical approach to characterize the wave behavior over arbitrary curvilinear MetaSurfaces. The proposed method allows us to fully characterize all propagating and evanescent wave modes from the MetaSurfaces. We will validate the proposed technique by designing, realizing and testing an ultrathin MetaSurface cloak for surface waves. Good results are obtained in terms of bandwidth, polarization independence and fabrication simplicity.
Highlights
There have been increasingly renewed interests in the study of electromagnetics based on applications of metamaterials which possess extraordinary properties not existing in nature[1,2]
In the previous paragraph we have found out the Impedance Z(r) profile of a generic curvilinear MetaSurface structure
It is known that electromagnetic surface waves are strictly confined to the interface, traveling in a direction parallel to the interface itself, its amplitude decreases with the distance[34]
Summary
There have been increasingly renewed interests in the study of electromagnetics based on applications of metamaterials which possess extraordinary properties not existing in nature[1,2] In addition to those conceptual designs such as perfect lens and invisibility cloaks, metamaterials have been used in manipulating electromagnetic waves by controlling their amplitude and phase ranging from microwaves to optics for engineering applications: telecommunications[3,4], computing and data[5,6], sensing and medicine[7,8]. In addition to conventional design approaches traditionally used at RF and microwaves, novel techniques were recently introduced to design MetaSurfaces at optical frequencies such as Bouguer theorem[16], carpet-cloak[17] and metamaterials for surface plasmon manipulations[18,19,20,21] All such methods are valid only for specific shape, geometries, excitation source, and polarization of the impinging electromagnetic wave. The entire path will be defined, from specifications and structure design to its manufacturing
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