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Proceedings Paper

Metamaterial-based cloaking with sparse distribution of spiral resonators
Author(s): K. Guven; E. Saenz; R. Gonzalo; E. Ozbay; S. Tretyakov
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Paper Abstract

We investigate the application of a metamaterial that is formed by the sparse distribution of spiral resonators as an optical transformation medium is in order to achieve electromagnetic cloaking. The well-known Clausius-Mossotti formula relates the microscopic polarizability of a single resonant particle to the macroscopic permittivity and permeability of the effective medium. By virtue of transformation optics, the permittivity and permeability of the medium, in turn, can be designed according to a coordinate transformation that maps a certain region of space to its surrounding. As a result, the mapped region can be cloaked from electromagnetic waves. In this study, the spirals are optimized to exhibit equal permittivity and permeability response so that the cloak formed by these spirals will work for both the TE and TM polarizations. An experimental setup is developed to visualize the steady state propagation of electromagnetic waves within a parallel plate waveguide including the cloaking structure. The measured and simulated electromagnetic field image indicates that the forward scattering of a metal cylinder is significantly reduced when placed within the cloak.

Paper Details

Date Published: 29 April 2010
PDF: 14 pages
Proc. SPIE 7711, Metamaterials V, 771111 (29 April 2010); doi: 10.1117/12.855099
Show Author Affiliations
K. Guven, Koç Univ. (Turkey)
E. Saenz, Public Univ. of Navarra (Spain)
R. Gonzalo, Public Univ. of Navarra (Spain)
E. Ozbay, Bilkent Univ. (Turkey)
S. Tretyakov, Aalto Univ. School of Science and Technology (Finland)

Published in SPIE Proceedings Vol. 7711:
Metamaterials V
Nigel P. Johnson; Ekmel Özbay; Richard W. Ziolkowski; Nikolay I. Zheludev, Editor(s)

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