Coherent interactions of strong optical near-fields with free elecrons

该项目利用与超短电子脉冲的相干相互作用对纳米系统中的强场过程进行成像，并利用定制的光场对其进行操纵。具体地说，我们将采用并进一步推广在第一个资助期内开发的两项互补技术：(I)在超快透射电子显微镜中对高能电子脉冲和阿秒电子脉冲序列进行量子相干非弹性散射，以及(Ii)在超快点投影显微镜中进行光学条纹。这两种技术都将纳米尺度的空间探测与亚周期的时间分辨率结合在一起，提供了对强非均匀量子系统中局部动力学相干输运现象的映射。特别是，我们将针对选定的纳米结构固态系统中的光驱动动力学，包括等离子体系统、氮-空位中心和等离子体-激子混合系统。基于这些模型系统，我们的目标是建立一个研究高激发态纳米系统超快动力学的通用实验平台。

The project proposed here addresses the imaging of strong-field processes in nanosystems using the coherent interaction with ultrashort electron pulses and their manipulation by tailored light fields. Specifically, we will employ and further extend two complementary techniques developed during the first funding period: (i) Quantum coherent inelastic scattering of high-energy electron pulses and attosecond electron pulse trains in an ultrafast transmission electron microscope and (ii) optical streaking in ultrafast point-projection microscopy. Both techniques combine nanoscale spatial probing with a sub-cycle temporal resolution, giving access to the mapping of local dynamics coherent transport phenomena in strongly inhomogeneous quantum systems. In particular, we will target light-driven dynamics in selected nanostructured solid-state systems, including plasmonic systems, nitrogen-vacancy centers and plasmon-exciton hybrid systems. Based on these model systems, we aim at establishing a universal experimental platform for the investigation of ultrafast dynamics in highly excited nanosystems.