期刊
ADVANCED FUNCTIONAL MATERIALS
卷 30, 期 21, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201910610
关键词
full-color vectorial holograms; metasurfaces; multi-dimensional manipulation
Phase, polarization, amplitude, and frequency represent the basic dimensions of light, playing crucial roles for both fundamental light-material interactions and all major optical applications. Metasurfaces have emerged as a compact platform to manipulate these knobs, but previous metasurfaces have limited flexibility to simultaneous control them. A multi-freedom metasurface that can simultaneously and independently modulate phase, polarization, and amplitude in an analytical form is introduced, and frequency multiplexing is further realized by a k-space engineering technique. The multi-freedom metasurface seamlessly combines geometric Pancharatnam-Berry phase and detour phase, both of which are frequency independent. As a result, it allows complex-amplitude vectorial hologram at various frequencies based on the same design strategy, without sophisticated nanostructure searching of massive geometric parameters. Based on this principle, full-color complex-amplitude vectorial meta-holograms in the visible are experimentally demonstrated with a metal-insulator-metal architecture, unlocking the long-sought full potential of advanced light field manipulation through ultrathin metasurfaces.
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