报告题目

Circular polarization from strong-field physics to attosecond science

报 告 人

韩猛 博士,苏黎世联邦理工学院

报告地点

物理楼中楼215

报告时间

2023年4月28日（周五）上午9:00-11:00

联 系 人

刘运全(62768852)

报告摘要

Attosecond time-resolved coincidence spectroscopy combined with circularly polarizedattosecondlight pulses is opening many interesting perspectives. In this talk, I will discuss how to easily generate and fully characterize the circularly polarizedattosecondlight pulses with a single, controllable helicity. Applying thisattosecondlight source into atomic systems, we observed a very strong circular dichroism of photoelectron vortices, both in the amplitude (up to 35%) and in the phase delays (up to 250 as) for argon atoms, and we further experimentally separated the Wigner and continuum-continuum delays (a longstanding challenge inattosecondscience) in helium atoms. In molecular systems, we resolved the forward-backward phase asymmetry in photoelectron circular dichroism (PECD) of chiral molecules by coincidence measurements. Transferring our methods from table-top HHG-based experiments to large facilities, such as free-electron lasers, it is more promising in measuring site- and element-specific dynamics in complex systems.

报告人简介

2020年于北京大学光学所获得博士学位, 2020年至今在苏黎世联邦理工学院从事博士后研究（玛丽居里学者）。主要方向为强场光物理和阿秒科学,相关工作发表在Nature Physics, Nature Photonics, Physical Review Letters等国际知名期刊上。