Plasmonic metasurfaces show great potential to manipulate the wavefront of surface plasmons (SPs) and enable realization of various chip‐level photonic devices. However, the current configurations can merely operate under specific incident polarization state and/or have limitation in independently tuning the phase and amplitude of SPs, although arbitrary incident polarization state is allowed. There is still the lack of a metasurface scheme that not only can couple spatial light waves into SPs under arbitrary polarization states, but also can independently modulate the amplitude and phase of the generated SPs. Here, it is proposed and experimentally demonstrated that double‐lined metallic nanoslits can be well designed to overcome these limitations. Practical metadevices are designed and fabricated for generating polarization‐independent plasmonic Airy beams, near‐field focusing, and intensity‐preserved “lossless” beams, and their excellent performances at 633 nm are characterized with near‐field scanning optical microscope. The presented results will offer opportunities for the practical plasmonic devices and applications based on the plasmonic metasurfaces.

中文翻译：

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具有等离子后表面的表面等离激元的偏振无关波前操纵

等离子体等离子表面显示出巨大的潜力来操纵表面等离激元（SP）的波前，并实现各种芯片级光子器件。然而，尽管允许任意入射偏振态，但是当前配置仅可以在特定的入射偏振态下操作和/或在独立地调节SP的相位和幅度方面具有局限性。仍然缺少超表面方案，该方案不仅可以将空间光波在任意偏振态下耦合到SP中，而且可以独立地调制所生成SP的幅度和相位。在此提出并通过实验证明，可以很好地设计双衬金属纳米缝，以克服这些限制。设计并制造了实用的元设备，用于生成与偏振无关的等离激元Airy光束，近场聚焦和强度保持的“无损”光束，并通过近场扫描光学显微镜表征了它们在633 nm处的出色性能。提出的结果将为基于等离子超表面的实际等离子设备和应用提供机会。