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Omnidirectional surface wave cloak using an isotropic homogeneous dielectric coating

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 b...

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Autores principales: Mitchell-Thomas, R. C., Quevedo-Teruel, O., Sambles, J. R., Hibbins, A. P.
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4974505/
https://www.ncbi.nlm.nih.gov/pubmed/27492929
http://dx.doi.org/10.1038/srep30984
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author Mitchell-Thomas, R. C.
Quevedo-Teruel, O.
Sambles, J. R.
Hibbins, A. P.
author_facet Mitchell-Thomas, R. C.
Quevedo-Teruel, O.
Sambles, J. R.
Hibbins, A. P.
author_sort Mitchell-Thomas, R. C.
collection PubMed
description 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 homogeneous dielectric waveguide of varying thickness, and exhibits omnidirectional operation.
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spelling pubmed-49745052016-08-12 Omnidirectional surface wave cloak using an isotropic homogeneous dielectric coating Mitchell-Thomas, R. C. Quevedo-Teruel, O. Sambles, J. R. Hibbins, A. P. Sci Rep Article 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 homogeneous dielectric waveguide of varying thickness, and exhibits omnidirectional operation. Nature Publishing Group 2016-08-05 /pmc/articles/PMC4974505/ /pubmed/27492929 http://dx.doi.org/10.1038/srep30984 Text en Copyright © 2016, The Author(s) http://creativecommons.org/licenses/by/4.0/ This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Mitchell-Thomas, R. C.
Quevedo-Teruel, O.
Sambles, J. R.
Hibbins, A. P.
Omnidirectional surface wave cloak using an isotropic homogeneous dielectric coating
title Omnidirectional surface wave cloak using an isotropic homogeneous dielectric coating
title_full Omnidirectional surface wave cloak using an isotropic homogeneous dielectric coating
title_fullStr Omnidirectional surface wave cloak using an isotropic homogeneous dielectric coating
title_full_unstemmed Omnidirectional surface wave cloak using an isotropic homogeneous dielectric coating
title_short Omnidirectional surface wave cloak using an isotropic homogeneous dielectric coating
title_sort omnidirectional surface wave cloak using an isotropic homogeneous dielectric coating
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4974505/
https://www.ncbi.nlm.nih.gov/pubmed/27492929
http://dx.doi.org/10.1038/srep30984
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