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Broadband electromagnetic cloaking with smart metamaterials

Author

Listed:
  • 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)

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.

Suggested Citation

  • Dongheok Shin & Yaroslav Urzhumov & Youngjean Jung & Gumin Kang & Seunghwa Baek & Minjung Choi & Haesung Park & Kyoungsik Kim & David R. Smith, 2012. "Broadband electromagnetic cloaking with smart metamaterials," Nature Communications, Nature, vol. 3(1), pages 1-8, January.
    • Handle: RePEc:nat:natcom:v:3:y:2012:i:1:d:10.1038_ncomms2219
    DOI: 10.1038/ncomms2219
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