Figure 1
(a) Schematic of the proposed the metamaterial structure. (b) The front view (indicated by red arrow above) of the structure. The geometric parameters are h = 20 nm, l 1 = 220 nm, and l 2 = 210 nm. The d 1 varies with d 2. The vertical height of unit cell satisfies 2d 1 + 2d 2 + 2h = 800 nm. The periods in both x and y directions are l = 400 nm. The incident radiation is along + z direction or −z direction and the polarization of them is both along x direction. Here, the polarization angle is marked by θ, that is, θ = 0(θ = 90°) represent the electric field along x(y) direction.
