Polarization conversion by an all-dielectric metasurface of a linear polarization mode to vector modes a) radial polarization b) azimuthal polarization c,d) a superposition of radial and azimuthal modes. Image taken from Tongming Liu et al 2017 J. Phys. D: Appl. Phys. 50 334001, © IOP Publishing, All Rights Reserved.
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