Coherent interactions of strong optical near-fields with free elecrons

本文提出的项目解决了纳米系统中强场过程的成像，利用与超短电子脉冲的相干相互作用和定制光场的操纵。具体而言，我们将采用并进一步扩展在第一个资助期间开发的两种互补技术：(i)超高速透射电子显微镜中高能电子脉冲和阿秒电子脉冲序列的量子相干非弹性散射和（ii）超高速点投影显微镜中的光学条纹。这两种技术都结合了纳米尺度的空间探测和亚周期的时间分辨率，从而获得了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，我们将在选定的纳米结构固体系统中瞄准光驱动动力学，包括等离子体系统，氮空位中心和等离子体激子杂化系统。基于这些模型系统，我们的目标是建立一个通用的实验平台来研究高激发纳米系统的超快动力学。

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.