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报告题目：Ultrafast Microscopy of Structured Light-Matter Waves - a Gateway to Axion Physics?

报告人：Hrvoje Petek, University of Pittsburgh, USA

报告时间：2023年11月24日（星期五）上午10:00

报告地点：线上/松山湖材料实验室新园区C204会议室

报告人简介

Prof. Hrvoje Petek obtained BS degree (1980) form MIT, and PhD degree (1985) from the University of California Berkeley both in chemistry. He worked with Keitaro Yoshihara as the National and Yamada Science Foundations postdoctoral fellow and Research Associate at the Institute of Molecular Science, Japan (1985-1992). He was a Senior Research Scientist at the Hitachi Advanced Research Laboratory (1993-2000), where he initiated research on ultrafast electron dynamics in the solid state. He is continuing this research as a Professor of Physics and RK Mellon Chair of Physics and Astronomy since 2000. Petek has been recognized with the Alexander von Humboldt Research Award (2000), Morino Award (2014), Ahmed Zewail Award in Ultrafast Science and Technology (2019), and as distinguished Scientist of the Chinese Academy of Sciences (2022). He is a Fellow of the American Physical Society, and American Academy of Arts and Sciences, the Editor-in-Chief of Progress in Surface Science, and a member of numerous advisory boards.

报告摘要

Light travels at 300 nanometers (10^-9 m) per femtosecond (10^-15 s), and nothing is faster than that. Then how can we take movies of light with resolution below its space/time period of oscillation as it propagates at a metal-vacuum interface as a light-matter charge density surface wave? We accomplish this by photoemission electron microscopy where we image its path by recording the spatial distributions of electrons that have absorbed two photons from two identical femtosecond pulses that cause field interference1. Scanning the pulse delay with 0.05 fs precision records images of plasmon fields as they evolve by 15 nm in every frame. We apply this methodology to image structured light in form of plasmonic vortices where optical fields are made to circulate in place as water going down a drain. In vortices, the normally transverse electric and magnetic fields in vacuum, become parallel. Such fields can drive coherent magnetoelectric phenomena, driving electron charge and spin responses, potentially interacting with the putative axion quasiparticles in condensed matter. We perform ultrafast microscopy of light towards Poincaré engineering2 of high energy physics phenomena at a laboratory scale.

1.Y. Dai, at al., Nature 588, 616 (2020)

2.Y. Dai, et al., Nature Reviews Physics 4, 562 (2022)