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4 January 2008 Single-negative negative index metamaterials with broad bandwidth
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The theoretical method to design negative refractive index metamaterials by single negative permittivity metamaterials is presented. By designing the electric and magnetic response metamaterials separately, the complexity of the design work can be simplified a lot. For the magnetic response metamaterials, the metallic post structure is adopted. Varying the height of the post, the response wavelength can be adjusted linearly. For electric metamaterials, wire-mesh structure is adopted. The effective material parameters, including refractive index, impedance, permittivity and permeability are given. Such a structure has negative refractive index during a broad frequency band and easy to design.
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Jianjun Chen, Zhongchao Fan, and Fuhua Yang "Single-negative negative index metamaterials with broad bandwidth", Proc. SPIE 6831, Nanophotonics, Nanostructure, and Nanometrology II, 683109 (4 January 2008);

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