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Metagratings have been shown to form an agile and efficient platform forextreme wavefront manipulation, going beyond the limitations of gradientmetasurfaces. Previous approaches for transmissive metagratings have resortedon compound asymmetric inclusions to achieve single-channel near-perfectdiffraction. However, such complex inclusions are sensitive to geometricparameters and lack the flexibility for arbitrary phase modulation, restrictingapplications to beam deflection. Here, we show perfect unitary diffraction inall-dielectric transmissive metagratings using rectangular inclusions bytailoring their multipole interferences. Using this principle, weexperimentally demonstrate analog phase profile encoding of a hologram throughdisplacement modulation of CMOS-compatible silicon nitride nanobars,manifesting broadband and wide-angle high diffraction efficiencies for bothpolarizations and across the entire visible range. Featured with extremeangle/wavelength/polarization tolerance and alleviated structural complexityfor both design and fabrication, our demonstration unlocks the full potentialof metagrating-based wavefront manipulation for a variety of practicalapplications.

Transmissive Metagrating for Arbitrary Wavefront Shaping Over the Full Visible Spectrum