Nondiffracting Bessel surface plasmon polariton (SPP) beams, which have unique self-healing, non-divergence, and linear transmission properties, have charming applications in plasmonic devices and on-chip interconnection circuits. Here we first realize, to the best of our knowledge, the ultrafast control and imaging of the Bessel SPP pulse on the nano-femto scale in the experiment. We demonstrate ultrafast control of Bessel SPP pulse switching by controlling the instantaneous polarization state of the excitation light. Moreover, this variation process is directly mapped on the nano-femto scale by time-resolved two-color photoemission electron microscopy. The results are well reproduced by the finite-difference time-domain (FDTD) method. The current study of ultrafast control and spatiotemporally imaging the switching process establishes an experimental paradigm for revealing the complex mechanisms in ultrafast control of nondiffracting SPP and are useful for developing high-speed, highly-integrated nanophotonic devices, and on-chip circuits.

中文翻译：

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非衍射表面等离子体激元超快控制的高时空分辨率成像

非衍射贝塞尔表面等离子体激元(SPP)光束具有独特的自愈、无发散和线性传输特性，在等离子体器件和片上互连电路中具有迷人的应用。在这里，据我们所知，我们首先在实验中实现了纳米飞秒级 Bessel SPP 脉冲的超快控制和成像。我们通过控制激发光的瞬时偏振态来展示对贝塞尔 SPP 脉冲切换的超快控制。此外，这种变化过程通过时间分辨双色光电子显微镜直接映射到纳米飞秒尺度上。时域有限差分 (FDTD) 方法很好地再现了结果。