期刊
PHYSICAL REVIEW B
卷 79, 期 24, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.245127
关键词
anisotropic media; metamaterials; nanowires; optical materials; refractive index; slabs
资金
- Department of Energy (Basic Energy Science) [DE-ACD2-07CH11358]
- AFOSR [FA 9550-06-10337]
- European Community project ENSEMBLE
We design three-dimensional (3D) metallic nanowire media with different structures and numerically demonstrate that they can be homogeneous effective indefinite anisotropic media by showing that their dispersion relations are hyperbolic. For a finite slab, a nice fitting procedure is exploited to obtain the dispersion relations from which we retrieve the effective permittivities. The pseudo focusing for the real 3D wire medium agrees very well with the homogeneous medium having the effective permittivity tensor of the wire medium. Studies also show that in the long-wavelength limit, the hyperbolic dispersion relation of the 3D wire medium can be valid even for evanescent modes.
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