Fig. 1. Rectangular dielectric metagrating for nearly unity anomalous diffraction. (a) A schematic illustration of the dielectric metagrating with a periodicity of

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Fig. 2. Mode dispersions of the rectangular dielectric metagrating. (a) A sketch of the mode expansion and coupling mechanism of the metagrating. (b) Wavevector components of the diffraction orders or waveguide-array-modes. Here, *z*-orientation wave vector of the incidence/exit ambient (regions I and III). (c)

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Fig. 3. Interferences of the modes and their contributions to the diffraction efficiencies with an incident angle of

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Fig. 4. Interferences of the modes and their contributions to the diffraction efficiencies with

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Fig. 5. Analysis of the anomalous refraction by mode decomposition. (a) The simulation result of the

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Fig. 6. Influence of material loss, material dispersion, and the substrate on the performance of the metagrating. (a) and (b) The

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