掌握飞秒光作用纳米结构所形成超快局域等离激元(LSP)的动力学演化规律对于其应用起着决定性作用。目前该方面研究中使用的干涉时间分辨光辐射电子显微技术存在着两飞秒光脉冲重叠时间内强光学干涉场掩盖等离激元在这一重要阶段动力学特性的问题。本项目首次提出采用正交飞秒光激发近场干涉时间分辨光辐射电子显微术解决现有技术中等离激元动力学演化过程被掩盖的难题。在此基础上，开展飞秒光场多维度操控下等离激元动力学演化的高时空分辨研究。其内容包括：纳米结构设计、制备，等离激元原位成像及其近场强度的测定；飞秒光场的啁啾、脉宽、波长等维度操控下等离激元动力学演化规律；少周期飞秒光作用下等离激元模式耦合对其动力学影响；不同极次等离激元模式的消相位时间测定及其动力学演化规律。通过上述研究，实现对超快局域等离激元动力学演化过程的调控及其纳米空间、阿秒步长时间分辨的全貌揭示，为超快、突破衍射极限局域光场的应用打下基础。

Grasping dynamic evolution of ultrafast localized surface plasmon(LSP) in nanoparticle excited by femtosecond laser is a key to its application. The currently available interferometric time-resolved photoemission electron microscopy(ITR-PEEM) has the drawback that dynamic evolution in the initial time period of near field oscillation is concealed due to the existence of intense interference field by the two laser with parallel polarization direction. We propose to unveil the concealed dynamic evolution by employing near field interference excited by two femtosecond laser pulses with orthogonal polarization. Furthermore, we perform high spatio-temporal resolved imaging of dynamics evolution by controlling parameters of femtosecond laser pulse. Our proposal mainly covers the following: 1.design and fabrication of nanoparticles, non-invasively imaging and direct detection of near field intensity by PEEM. 2 dynamics evolution of ultrafst plasmon under the controlled femtosecond laser parameters. 3. effect of mode coupling on dynamics evolution of plasmon excited by few cycle femtosecond laser. 4. dephasing time measurement of dipolar and quadrupolar plasmon mode and a comparison of their dynamics. It is expected that full dynamics of ultrafast plasmon can be revealed with a nanometer and attosecond step resolution through our effort. The work will pave the way for the research and application of the ultrafast super diffraction limit local optical field.