Metasurface polarization optics—platforms that can structure light’s polarization point-by-point at the nanoscale—have enabled compact polarization imaging and characterization systems. However, so far these schemes (and conventional polarization optics) can only control incoming polarization in one plane, transverse to the propagation direction. In a recent effort, we have introduced a new class of metasurface polarization optics which can perform parallel processing on incoming light over multiple planes along the propagation direction. After a single interaction with our new devices,...
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