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摘要
We report the dual refractions in the metamaterials composed of metal nanorod arrays and alumina at visible wavelengths. By simulating the energy stream distributions of the nanorod arrays for H-polarized waves, we find that the dual refractions exist in the transition region starting from a critical ratio of the wavelength in free space to the neighbor nanorod distance. The critical ratio is a function of the radius of nanorods and the material used but does not vary with incident wavelengths. The dual refractions can serve as a criterion for applicability of the effective medium theory in the metamaterials based on nanorod arrays.
- 出版日期2010-6
- 单位南阳理工学院
