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Fig. 1 | PhotoniX

Fig. 1

From: Dielectric metasurface zone plate for the generation of focusing vortex beams

Fig. 1

Metasurface zone plate and the optical properties of the dielectric meta-atoms. a Schematic of a metasurface zone plate. b Side and top view of a single SiNx meta-atom, which is arranged in a square lattice. c The calculated phase-retardation and transmittance of a single meta-atom in a unit cell with H = 1 μm, L = 400 nm as a function of the radius R at the incident light wavelength of 633 nm

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