Fig. 4

Arbitrary structured quantum emission with polarising beam-splitting metalenses. A Schematics of different metalens functionalities. The circles represent desired positions for orthogonal linear polarisations in the K space. The doughnut-shaped spots indicate the generation of OAM. B Far-field optical images of the fabricated metalens. Scale bar is 30 μm. C Experimental (top) and numerically calculated (bottom) results of the SPE far-field back focal imaging. Curves in c represent the vertically accumulated PL intensity of the LPx (filled with red) and LPy (filled with blue). The red and blue circles are zoomed-in insets for highlighting the intensity distributions of the orthogonal polarisations