Broadband electromagnetic cloaking with smart metamaterials

Dongheok Shin, Yaroslav Urzhumov, Youngjean Jung, Gumin Kang, Seunghwa Baek, Minjung Choi, Haesung Park, Kyoungsik Kim () and David R. Smith
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Dongheok Shin: School of Mechanical Engineering, Yonsei University
Yaroslav Urzhumov: Center for Metamaterials and Integrated Plasmonics, Duke University
Youngjean Jung: School of Mechanical Engineering, Yonsei University
Gumin Kang: School of Mechanical Engineering, Yonsei University
Seunghwa Baek: School of Mechanical Engineering, Yonsei University
Minjung Choi: School of Mechanical Engineering, Yonsei University
Haesung Park: School of Mechanical Engineering, Yonsei University
Kyoungsik Kim: School of Mechanical Engineering, Yonsei University
David R. Smith: Center for Metamaterials and Integrated Plasmonics, Duke University

Nature Communications, 2012, vol. 3, issue 1, 1-8

Abstract: Abstract The ability to render objects invisible with a cloak that fits all objects and sizes is a long-standing goal for optical devices. Invisibility devices demonstrated so far typically comprise a rigid structure wrapped around an object to which it is fitted. Here we demonstrate smart metamaterial cloaking, wherein the metamaterial device not only transforms electromagnetic fields to make an object invisible, but also acquires its properties automatically from its own elastic deformation. The demonstrated device is a ground-plane microwave cloak composed of an elastic metamaterial with a broad operational band (10–12 GHz) and nearly lossless electromagnetic properties. The metamaterial is uniform, or perfectly periodic, in its undeformed state and acquires the necessary gradient-index profile, mimicking a quasi-conformal transformation, naturally from a boundary load. This easy-to-fabricate hybrid elasto-electromagnetic metamaterial opens the door to implementations of a variety of transformation optics devices based on quasi-conformal maps.

Date: 2012
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DOI: 10.1038/ncomms2219

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