飞秒等离激元结构阵列辐射的纳米尺度超短电子脉冲将在下一代自由电子激光、光阴极、光辐射基础的超快微电子器件以及电子显微术中发挥重要的作用。迄今为止，尚未有等离激元纳米结构阵列辐射电子脉冲特性高空间分辨研究的报道。本项目采用具有测量电子能量功能的光辐射电子显微镜（其空间分辨率好于20nm，能量分辨率优于50meV），首次提出对飞秒激光作用金属纳米结构阵列的电子辐射过程及其特性进行高空间-能量分辨研究，并对出射的电子脉冲进行全光控制。研究结构参数，飞秒光场参数等对电子辐射机制以及相应的电子产额、能谱（主要是电子能量分布及截止能量）的影响，并掌握其电子辐射过程的调节控制方法。进一步通过改变单束飞秒光脉冲偏振方向以及双束飞秒光脉冲间的延时等方法，实现对等离激元金属结构阵列所辐射出飞秒-纳米时空尺度电子脉冲的出射位置、开关切换以及具有亚飞秒延时精度双电子脉冲形成等过程的全光控制。

Nanoscale ultrashort electron pulse from femtosecond plasmonic nanostructure will play an important role in the next generation x-ray free electron laser, ultrafast photocathode, photoemission-based microelectronics and ultrafast electron microscopy. Up to now, there is no report on feature investigation of electron pulse from plasmonic nanostructure in high spatial resolution mode. To the best of our knowledge, we first propose the investigation on photoemission electron process of plasmonic nanostructure with a high spatiotemporal resolution Time-of-Flight PEEM as well as perform all-optical control on electron pulse generation. The influence of nanostructural and femtosecond laser parameters on photoelectron mechanism and the corresponding electron yield as well as electron energetic spectrum will be carried out to deeply understand how to adjust the photoelectron process. Furthermore, by varying polarization direction of single femtosecond laser beam and delay between the pulses of the two femtosecond laser beams, an all-optical control of electron emission sites, electron pulse switching and double electron pulses generation with a separation of sub-fs temporal precision will be realized.