Figure 1

(a) Schematic view of the CPC. (b) Top view of the CPC. (c) Simulated scattering amplitudes and phases of the cross-polarized radiation from the individual CPCs. The amplitude is normalized to the incident x-polarized light. The silicon layer thickness D is 80 μm, while the thicknesses of both the grating layer and the antenna layer are represented by d with a value of 40 nm. The spacing between two neighboring CPC units is also 80 μm. The eight CPC units are composed of selected C-shaped antennas and identical gratings. The period Λ and width W of the grating are 10 μm and 4 μm, respectively. The first four antennas have opening angles of 2α = 50°, 37°, 15°, and 95°, with corresponding widths of l = 10, 3, 3, and 10 μm and angles of θ = −25°, −18.5°, −17.5°, and 37.5°, respectively. The other four antennas are mirror images of the first four antennas.