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30 September 2005 Negative permittivity and permeability in the infrared due to dielectric spheres
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In this paper we consider the effective electric and magnetic properties of a three-dimensional collection of non-magnetic spheres. Polaritonic materials are used, so that the Mie resonances of the spheres are excited in the long-wavelength regime of the surrounding medium. We consider a simple cubic lattice based on LiTaO3 and find that it is possible to engineer a fundamental resonant magnetic response. The effective media parameters derived by this approach are isotropic, and closely match those obtained by band structure calculations. Frequency ranges with either negative permittivity or negative permeability are found. Within these ranges a negative group velocity is observed. Coated spheres with a negative index of refraction are also presented.
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Mark S. Wheeler, J. Stewart Aitchison, and Mohammad Mojahedi "Negative permittivity and permeability in the infrared due to dielectric spheres", Proc. SPIE 5971, Photonic Applications in Nonlinear Optics, Nanophotonics, and Microwave Photonics, 597113 (30 September 2005);

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