Figure 1
From: A visible metamaterial fabricated by self-assembly method

Schematic illustration of an array of three-layer asymmetrical nanostructures and the polarization configuration of an electromagnetic wave.
The geometrical parameters are w = 95 nm, r = 70 nm, t = 30 nm and h = 40 nm and the electromagnetic wave is at normal incidence with the electric field along the y-direction. The rectangular part surrounded with yellow line is the structural unit.