Noninterleaved Metasurface for Full‐Polarization Three‐Dimensional Vectorial Holography
Hui Yang, Yuting Jiang, Yueqiang Hu, Kai Ou, Huigao Duan
Abstract
Abstract Metasurface‐enabled full‐polarization vectorial holography has attracted numerous attention due to the promising applications for multichannel displays, enhanced information capacity, and optical encryption. However, recently showcased design strategies suffer from undesirable cross‐talk resulting from interleaved meta‐atoms and are restricted to a two‐dimensional plane. This work presents a general approach for full‐polarization beam shaping in three‐dimensional space by completely exploiting the capacity of a noninterleaved metasurface. The noninterleaved metasurface is spin‐decoupled, which is capable of achieving independent phase control for the two orthogonal circular polarizations by combining both propagation and geometric phases. As a proof‐of‐concept, a three‐dimensional vectorial holography capable of converting the linear polarized light to holographic images with arbitrary spatial polarization distributions is experimentally demonstrated. Taking use of the extended dimension, the z ‐axis distance, which provides a new degree of flexibility for boosting information capacity and security, a double‐level optical encryption scheme is implemented. This work provides a compact and general scheme for full‐polarization channel wavefront steering, unlocking a new door for designing planar polarization functionality devices.