基于量子干涉的阿秒电子波包测量方法研究

项目名称： 基于量子干涉的阿秒电子波包测量方法研究

项目编号： No.61475055

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 无线电电子学、电信技术

项目作者： 陆培祥

作者单位： 华中科技大学

项目金额： 94万元

中文摘要： 电子作为构成物质的最基本粒子，电子的行为影响着原子、分子内部的超快动力学过程。对电子波包的高时间分辨超快测量不仅为认识微观电子超快运动过程带来重要的研究手段，而且在基础物理学、化学、材料和生命科学等学科的超快动力学研究中有重要应用前景。目前国际上所采用的阿秒电子波包测量方法以及发展起来的相应测量装置如VMI、COLTRIMS等只能测得其振幅，却不能同时测量反映电子波动性重要信息的电子波包相位，从而制约了人们对于电子超快行为物理本质的进一步深入认识。本项目拟开展可以同时获得阿秒电子波包振幅和相位完全信息的测量方法研究。类比SPIDER诊断激光脉冲的方法，通过在阿秒电子波包之间形成一个动量剪切量，获得量子干涉条纹，并从干涉条纹中同时提取阿秒电子波包的振幅和相位信息。通过对电子波包演化过程的控制与优化，提高测得的干涉条纹可见度，进一步提升测量准确度。

中文关键词： 相位；电子波包；阿秒；干涉

英文摘要： Electron is the most elementary particles constructing the matter world. The electron behavior affects the internal ultrafast processes in atoms and molecules. Measuring the ultrafast evolution of electron wave packet with high time resolution is important not only for the understanding of the process of microscopic electronic ultrafast dynamics, but also for the study of the ultrafast dynamics in many other subjects such as basic physics, chemistry, material science and life science. To date, the method used for the detection of attosecond electron wave packet as well as the measuring instrument, such as VMI and COLTRIMS, can only measure the amplitude, while cannot extract the phase. Since the phase of electron wave packet contains the important information of the wave property of the electron, the absence of the phase information has greatly restricted the further in-depth understanding of the physical nature of the ultrafast electron behavior. In this projection, we propose to develop a method that can measure both amplitude and phase of the attosecond electron wave packet at the same time. Analogous to the SPIDER diagnostic method for laser pulses, a momentum shear between the electron wave packets is formed, and then the amplitude and phase can be obtained simultaneously from the quantum interference fringe. By optimizing and controlling the evolution of the electron wave packet, the visibility of interference fringes can be significantly improve, which leads to a more accurate measurement.

英文关键词： Phase;Electron wavepacket;Attosecond;Interference