Asymmetric spatial power beam splitter based on all dielectric metasurface with transmission phase

In order to freely manipulate electromagnetic beam, a transmissively coded metasurface beam splitter is proposed. The unit structure of the coded metasurface can be constructed by using polyimide as substrate and quadrate silicon column as dielectric scattering resonance cell. By changing the height of the square column of silicon material, the transfer phase of the cell structure can be changed. These unit structures with certain phase difference and large transmission amplitude can be encoded to construct the all dielectric coded metasurface. Based on different coding arrangement, different angles and different numbers of beam splitting can be achieved. By changing the incident angle, multiple beams with different energy distribution ratio can be obtained. Asymmetric spatial power beam splitter can be realized by using these encoding metasurfaces. Based on the phase array antenna principle, the calculated scattering angle agrees well with that of the numerical simulation.