A Quad-band Meta-hologram Based on Reflective Metasurface with Complex-amplitude Control

Metasurface has been widely used to manipulate electromagnetic wave. To achieve better performance, it is essential to achieve multi-band metasurface with both phase and amplitude controls. In this work, a quad-band reflective meta-atom is proposed with independent complex-amplitude controls at four operation frequencies. In addition, a quad-band meta-hologram is demonstrated to reconstruct the circularly polarized incident wave into different images. The proposed method shows great potential in multifunctional meta-devices with enhanced performance.