Angle control of far-field scattering based on all dielectric transmissive geometric phase metasurface in near-infrared region

Abstract

For a common metasurface with gradual phase, once the metasurface element structure is designed, we can only obtain a limited number of abnormal deflection angles based on the different arrangement characteristics of the metasurface element structure. In order to obtain continuously varying anomalous deflection angles, we propose addition and subtraction operations for coded metasurface sequences. In order to simplify the design process, we use geometric phase coding units to construct coded metasurface sequences. We can perform the addition and subtraction operations for two initial encoding metasurface sequences, and a new encoding sequence can be obtained. And a new corresponding scattering angle can be achieved. One do not need to redesign the size of the coding unit, and a continuous variation of deflection angles can be realized.