FIG. 4. Performance of the combined metacoupler. (a) Top view of the combined waveguide metacoupler. (b)–(g) Color map of the intensity in the center of the PMMA layer for the metacoupler in (a) when the incident light is a Gaussian beam with the beam radius of 6 μm. The polarization state jui of the beam is displayed in the upper-right corner. Note that the scale bar is chosen to better highlight weak intensity features, while (b) shows the numbering of the six ports marked with gray lines. (h) Circles and asterisks indicate retrieved and exact polarization states, respectively, of the incident beam for 42 different SOPs, plotted in the (s1, s2, s3) space together with the Poincaré sphere. Colors are used as an aid to differentiate between the different circle-asterisk pairs.
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