3D Reconfigurable Vectorial Holography via a Dual-Layer Hybrid Metasurface Device

Metasurface-based vectorial holography manifests itself as an advanced platform for large-capacity information storage, holographic display, and cryptography. However, a convenient and effective reconfigurable vectorial hologram generation mechanism still remains a challenge. Here, a rotation-driven reconfigurable vectorial holography scheme is developed via a dual-layer hybrid metasurface device, in which radiation-type and birefringent metasurfaces are cascaded hybridly. Thus, reconfigurable and highly customizable intensity and polarization response of holograms in the 3D space is achieved. Rotatable radiation-type metasurface (RTM) serves as an incidence-wavefront modulator to excite the non-rotatable birefringent metasurface (BM). The gradient descent optimization inverse design method is introduced to achieve the high-efficiency reconstruction of the Jones vector and Jones matrix distribution on both RTM and BM. On this basis, numerical analysis and experimental verification of 3-D reconfigurable vectorial holography are demonstrated in the microwave region. This scheme implies a new paradigm for 3-D reconfigurable vectorial holography and can lead to advances in high-capacity optical display, switchable meta-devices, and cryptography.