研究目的
To generate multiple polarization-controllable OAM vortex beams at microwave frequencies using a reflective-type metasurface constituted by anisotropic elements.
研究成果
The proposed anisotropic coding metasurface can generate multiple OAM vortex beams with different polarizations, beneficial for the application of polarization division multiplexing for OAM communication system.
研究不足
The polarization state of OAM is highly dependent on that of incident light, indicating that it remains a great challenge to control the polarization status of the beams freely and independently.
1：Experimental Design and Method Selection:
The study employs a phase compensation theory to determine the array pattern of the metasurface for generating vortex beams with arbitrary polarization.
2：Sample Selection and Data Sources:
The metasurface is composed of anisotropic elements, with reflection phases engineered and encoded separately along different polarization directions.
3：List of Experimental Equipment and Materials:
A cross-shaped element is selected as the unit cell of the anisotropic metasurface, standing on the substrate F4B backed by an ultrathin copper ground layer.
4：Experimental Procedures and Operational Workflow:
The phase distribution of the meta-atoms is determined with predesigned propagation direction and polarization status for multiple OAM vortex beams.
5：Data Analysis Methods:
Numerical simulations are performed to validate the design procedure.
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