FIG. 2. Design of metacouplers. (a) Sketch of the unit cell of a GSP-based metacoupler. (b) Calculated reflection coefficient as a function of nanobrick widths (Lx, Ly) for x-polarized normal incident light and geometrical parameters Λ ¼ 470 nm, ts ¼ 70 nm, tPMMA ¼ 400 nm, t ¼ 50 nm, and wavelength λ ¼ 800 nm. The color map shows the reflection amplitude, whereas the solid lines represent contour lines of the reflection phase for both x- and y-polarized light.
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