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Proceedings Paper

Experimental demonstration of broadband perfect invisibility cloak composed of all-dielectric materials
Author(s): Zeki Hayran; Ramon Herrero; Muriel Botey; Hamza Kurt; Kestutis Staliunas
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Paper Abstract

With the development of various recent tools to control electromagnetic wave propagation, such as transformation optics, the long-sought dream of rendering objects invisible has become a matter of practical implementation. However, the required index profile derived with such techniques leads to material properties that are not readily available in nature and, hence, various experimental simplifications and performance scarifications are inevitable. Therefore, it has been a widespread belief that perfect cloaking cannot be achieved with conventional materials. Here, we follow a different direction and provide a unique method based on scattering cancellation rather than conventional coordinate transformations, and show that perfect invisibility can be indeed achieved for any specified angular range and operational bandwidth by employing merely all-dielectric materials. The presented method is based on our recently proposed generalized Hilbert-like transform [1] that is able to eliminate the undesired scattered waves for any type of object, regardless of its shape/size, by directly tailoring the object’s scattering potential. In this direction, we show that the impinging wave on an object can be perfectly restored owing to the effective cancellation of the scattered waves emanating from the object and the surrounding index profile. We demonstrate this effect by experimental analyses conducted at the gigahertz regime. The proposed method represents an important step towards the ultimate goal of cloaking arbitrarily large objects at various wavelength regimes and may have profound implications especially in noninvasive near-field probing applications, where conventional transformation optics based cloaks fail to provide the interaction of the wave with the object.

Paper Details

Date Published: 21 February 2018
PDF: 8 pages
Proc. SPIE 10541, Photonic and Phononic Properties of Engineered Nanostructures VIII, 105410Y (21 February 2018);
Show Author Affiliations
Zeki Hayran, TOBB Univ. of Economics and Technology (Turkey)
Ramon Herrero, Univ. Politècnica de Catalunya (Spain)
Muriel Botey, Univ. Politècnica de Catalunya (Spain)
Hamza Kurt, TOBB Univ. of Economics and Technology (Turkey)
Kestutis Staliunas, Univ. Politècnica de Catalunya (Spain)
Institució Catalana de Recerca i Estudis Avançats (Spain)

Published in SPIE Proceedings Vol. 10541:
Photonic and Phononic Properties of Engineered Nanostructures VIII
Ali Adibi; Shawn-Yu Lin; Axel Scherer, Editor(s)

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