Fig. 2: Design and fabrication of geometric metasurfaces and LCP OAM sorting at a wavelength of 633 nm. | Light: Science & Applications

Fig. 2: Design and fabrication of geometric metasurfaces and LCP OAM sorting at a wavelength of 633 nm.

From: Spin-decoupled metasurface for simultaneous detection of spin and orbital angular momenta via momentum transformation

Fig. 2

a Simulated polarization conversion ratio (PCR) of the unit cell. Inset: Schematic diagram of the unit cell, which is composed of TiO2 nanopillars on a SiO2 substrate in a hexagonal lattice. H = 800 nm, P = 300 nm, L = 240 nm, and W = 100 nm. b Top-view and perspective-view scanning electron microscopy (SEM) images of the fabricated geometric metasurfaces. c Measured and simulated focusing patterns for different OAM modes with the topological charge increasing from 1 to 10. d Theoretical and measured azimuthal coordinates of the focus peak versus the topological charge. e OAM prediction results based on the measured azimuthal coordinates in (d)

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