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Tunable graphene metasurfaces by discontinuous Pancharatnam-Berry phase shift

机译：不连续的Pancharatnam-Berry相移可调谐的石墨烯超表面

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摘要

Metal-dielectric-graphene three-layer structures are proposed to improve the interaction of graphene micro- and nanostructures with incident waves, as the upper graphene cut-wire layer introduces a discontinuous Pancharatnam-Berry phase profile. A semi-analytical method based on the Jones calculus is conducted to investigate the conversion efficiency of cross-polarized light on this graphene metasurface for circularly polarized wave incidence, which predicts that the physical constraint (25%) of cross-coupling conversion efficiency for individual graphene layers can be overcome. Numerical simulations confirm the conclusion and demonstrate an efficiency as high as 60%. Based on this mechanism, high-efficiency anomalous reflection surfaces and flat focal mirrors are designed with the tunability of reflection angles and one order of magnitude improved focusing intensity. This method paves the way to engineering high-efficiency graphene metasurfaces for tunable electromagnetic wave manipulation.
机译：提出了金属-介电-石墨烯三层结构，以改善石墨烯微结构和纳米结构与入射波的相互作用，因为上部石墨烯切割线层引入了不连续的Pancharatnam-Berry相轮廓。进行了基于琼斯演算的半解析方法，研究了在该石墨烯超表面上对于圆偏振波入射的交叉偏振光的转换效率，该方法预测了单个交叉耦合转换效率的物理限制（25％）。可以克服石墨烯层。数值模拟证实了这一结论，并证明了高达60％的效率。基于这种机制，设计了高效反常反射面和平面聚焦镜，具有反射角的可调性和提高了一个数量级的聚焦强度。此方法为工程化可调节电磁波的高效石墨烯超表面铺平了道路。

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