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We numerically demonstrate a highly efficient optica huygens metagrating withunprecedentedly simple structure (only one meta-atom per period) designed viaaggressively discretized method which initially originated from discretizedmetasurface design, performing nearly lossless anomalous refraction underTM-polarized incident light. A 2D full-wave floquet simulation shows that theproposed metagrating anomalously transmits and incident light of 800 nmwavelength with up to 94% power efficiency, where the specular 2transmission issubstantially suppressed. our findings can also help demarcate the boundarybetween metagrating and metasurface.

Optical dielectric huygens metagrating performing near unity anomalous refraction at TM mode with extremely simple design