Tunable Double Negative Band Structure from Non-Magnetic Coated Rods

Details Tunable Double Negative Band Structure from Non-Magnetic Coated Rods Tunable Double Negative Band Structure from Non-Magnetic Coated Rods

2010-05-12

arxiv.org/abs/1005.2178v2

Physics

Optics

Scientific paper

A system of periodic poly-disperse coated nano-rods is considered. Both the coated nano-rods and host material are non-magnetic. The exterior nano-coating has a frequency dependent dielectric constant and the rod has a high dielectric constant. A negative effective magnetic permeability is generated near the Mie resonances of the rods while the coating generates a negative permittivity through a field resonance controlled by the plasma frequency of the coating and the geometry of the crystal. The explicit band structure for the system is calculated in the sub-wavelength limit. Tunable pass bands exhibiting negative group velocity are generated and correspond to simultaneously negative effective dielectric permittivity and magnetic permeability. These can be explicitly controlled by adjusting the distance between rods, the coating thickness, and rod diameters.

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