Abstract
Hexagonal arrays of gold triangular nanoprisms are studied as a metamaterial slab. Tri-dimensional (3D) finite-difference time domain (FDTD) simulations are used to calculate the reflected and transmitted electromagnetic fields and the S-parameter method is used to retrieve the constitutive parameters. One layer metamaterial slab presents an electric resonance, leading to negative values of permittivity, due to the dipolar plasmonic resonance of the constituent nanoprisms. Using two shifted layers of triangular nanoprisms a negative refractive index metamaterial is obtained in the visible range of the spectrum (430–450 THz) as a result of hybridized plasmonic states inversion.
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