10 September 2010 A three-dimensional negative refractive index medium operated at multiple-angle incidences
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Abstract
We present a negative refractive index medium (NRIM) operating at multiple-angle incidences by expanding a conventional planar metamaterial to a three-dimensional (3D) structure. The proposed 3D NRIM is comprised of semi-spherical metal shells and planar plamonic wires, thus giving rise to negative magnetic permeability and negative electric permittivity, respectively. Our results show that reflectance (transmittance) peaks slightly which locate the region of negative refraction index are insensitive to the incident angles from 0° to 45° and the polarization of the excitation wave at a certain range of frequencies. Such pseudo-isotropic NRIM may be exploited for superlens and antenna applications.
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Ting-Tzuo Yeh, Ting-Tzuo Yeh, Ta-Jen Yen, Ta-Jen Yen, "A three-dimensional negative refractive index medium operated at multiple-angle incidences", Proc. SPIE 7754, Metamaterials: Fundamentals and Applications III, 77541U (10 September 2010); doi: 10.1117/12.862500; https://doi.org/10.1117/12.862500
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