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Visible negative refraction in natural indefinite material: MgB2
Jingo Sun, Bo Li, Ji Zhou

Last modified: 2012-01-02


In this work, we report a nature indefinite permittivity in crystalline MgB2 that exhibits negative group refraction for blue-purple light. Based on the ellipsometry data reported in literature, the equifrequency contour (EFC) is verified to be hyperbolic which enables a negative refraction for all incident angles. The indefinite dielectric tensor is attributed to the two Drude dispersions with different plasma frequencies between two crystal directions, which are derived from the strong anisotropic crystal structure. Numerical simulations are performed to demonstrate the negative refraction behaviour and the focusing property as a hyperlens.


MgB2, indefinite medium, negative refraction, ellipsometry