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Coding metasurfaces, as a new type of design concept, have provided many attractive functionalities for manipulating the wave fronts of light. Previous research only focused on linear coding metasurfaces; however, with the increasing demand for highly integrated and compact multifunctional chips, the drawbacks of linear coding metasurfaces, the constraints on information capacity and operating frequency...
Optical vortices have emerged as a potential approach to enhance data capacity for its extra degree of freedom of orbital angular momentum. Although linear metasurfaces have been used to generate optical vortices, their capacity can be further increased by involving nonlinear frequency conversions, providing new channels for data storage. Here, by introducing second harmonic Pancharatnam–Berry phase,...
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