Abstract Surface plasmon polaritons (SPPs) are special electromagnetic modes propagating along the metal-dielectric interfaces, which have attracted widespread attention in various scientific communities due to well-confined surface waves and enhanced optical fields. Therefore, the effective directional excitation and control of SPPs are research hotspots in the field of nanophotonics and plasmonics, and the most extreme challenges. Herein, we demonstrate a metasurface for phase modulation and effective directional excitation of the SPPs. The dynamic control of phase is realized by appropriately arranging rectangular apertures in a gold film. By carving a periodic array of grooves on one side of the rectangle apertures, Bragg reflection increases the intensity of SPPs propagated to the other side, enabling directional and efficient excitation.

中文翻译：

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用于表面等离子体激元极化控制相位定向耦合的超表面

摘要 表面等离子体激元（SPPs）是一种沿金属-电介质界面传播的特殊电磁模式，由于其严格限制的表面波和增强的光场引起了各个科学界的广泛关注。因此，SPPs的有效定向激发和控制是纳米光子学和等离子体学领域的研究热点，也是最极端的挑战。在此，我们展示了用于 SPP 的相位调制和有效定向激发的超表面。相位的动态控制是通过在金膜中适当排列矩形孔来实现的。通过在矩形孔的一侧刻上周期性的凹槽阵列，布拉格反射增加了传播到另一侧的 SPP 的强度，从而实现了定向和有效的激发。