Due to their subwavelength thickness, light weight and easy fabrication, metasurfaces show obvious advantages over 3D metamaterials. Among this, a new concept so-called digital coding metasurfaces which are described in a direct manner by quantized reflection or refraction phases was proposed. This paper proposes a scheme to achieve simultaneous and independent control of phase and amplitude responses via a reflective coding metasurface as it would be beneficial for full control of propagation of electromagnetic waves. The deflection of the reflected beam is dominated by designed coding patterns of digital unit cells while the amplitude adjustment depends on tuning values of loaded resistances on the unit cells. The simulation and experimental results confirm the function of the metasurface proposed above. The independent control of both phase and amplitude profiles of EM waves implies the potential application in beam shaping and high-quality holography.

由于其亚波长厚度、重量轻且易于制造，超表面显示出优于 3D 超材料的明显优势。其中，提出了一种新概念，即所谓的数字编码超表面，它通过量化的反射或折射相位以直接方式描述。本文提出了一种通过反射编码超表面实现对相位和幅度响应的同步和独立控制的方案，因为它有利于完全控制电磁波的传播。反射光束的偏转由数字单元的设计编码模式决定，而幅度调整取决于单元上加载电阻的调谐值。模拟和实验结果证实了上述超表面的功能。