Fig. 2

Normal-incidence absorption (a) and reflection (b) spectra of metamaterials schematically shown in Fig. 1, in the wavelength range from 550 to 1000 nm. The array period p _x along the x-axis direction is varied from 550 to 900 nm in steps of 50 nm. The other geometrical parameters: d = 150 nm, h = 50 nm, t = 30 nm, and p _y  = 500 nm. For clarity, individual spectra in a and b are vertically offset by 90 and 60% from one another, respectively