Omnidirectional surface wave cloak using an isotropic homogeneous dielectric coating
Nature Publishing Group
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Reason for embargo
This is the author accepted manuscript. it is currently under an indefinite embargo pending publication by Nature Publishing Group.
The field of transformation optics owes a lot of its fame to the concept of cloaking. While some experimental progress has been made towards free-space cloaking in three dimensions, the material properties required are inherently extremely difficult to achieve. The approximations that then have to be made to allow fabrication produce unsatisfactory device performance. In contrast, when surface wave systems are the focus, it has been shown that a route distinct from those used to design free-space cloaks can be taken. This results in very simple solutions that take advantage of the ability to incorporate surface curvature. Here, we provide a demonstration in the microwave regime of cloaking a bump in a surface. The distortion of the shape of the surface wave fronts due to the curvature is corrected with a suitable refractive index profile. The surface wave cloak is fabricated from a metallic backed homogenous dielectric waveguide of varying thickness, and exhibits omnidirectional operation.
This work was funded by the Engineering and Physical Sciences Research Council (EPSRC), UK under a Programme Grant (EP/I034548/1) ‘‘The Quest for Ultimate Electromagnetics using Spatial Transformations (QUEST).”
This is the author accepted manuscript. The final version is available from the publisher via the DOI in this record.
Vol 6, Article number: 30984