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Gradient metasurfaces have been extensively applied in recent years forenabling an unprecedented control of light beam over thin optical components.However, these metasurfaces suffer from low efficiency when it comes to bendinglight with large angle and high fabrication demand when it requires finediscretion. In this work, we investigate the all-dielectric metagrating basedon mie-type resonances interference, allowing extraordinary optical diffractionfor beam steering with ultralarge angle. It is found that the coupling insideand among lattice of metagrating can tune the exciting state of electric andmagnetic resonances including both fundamental dipoles and high-ordermultipoles, leading to ideal asymmetrical scattering pattern for redistributingthe energy between the diffraction channels at will. The participation ofquadrupole and hexapole not only significantly enhance the working efficiency,but also bring distinctive possibilities for wave manipulation which cannot bereached by dipoles. Utilizing a thin array of silicon rods, large-anglenegative refraction and reflection are demonstrated with almost unityefficiency under both polarizations. Compared with conventional metasurfaces,such an all-dielectric mategrating has the merits of high flexibility, highefficiency and low fabrication demand. The strong coupling and prosperousinteractions among multipoles may behave as a cornerstone for broad range ofwavefront control and offer an effective solution for various on-chip opticalwave control such as bending, focusing, filtering and sensing.

High-order multipoles in all-dielectric metagrating enabling ultralarge-angle light bending with unity efficiency