【报告题目】: Topological  photonic quasiparticles of free space-time

【报告人】: 申艺杰博士、助理教授，新加坡南洋理工大学

【报告地点】: 线上腾讯会议：320-157-708

【报告时间】: 2024年3月4日15:30-16:30

【报告摘要】:

Topological  complex electromagnetic waves give access to nontrivial light-matter  interactions and provide additional degrees of freedom for information transfer.  For instance, topologically stable quasiparticles or skyrmions have been  demonstrated in quantum fields, solid-state physics, and magnetic materials, but  only recently observed in photonic fields, triggering fast expanding research  across different spectral ranges and applications. Here I  introduce an extended family of photonic skyrmions within a unified  framework, starting from fundamental theories to experimental generation and  topological control in spatiotemporally structured light. I will further  highlight generalized classes of optical topological quasiparticles beyond  skyrmions and outline their exotic topological robust properties, emerging  applications, future trends, and open challenges. A complex vectorial field  structure of optical quasiparticles with versatile topological characteristics  controlled in ultrasmall and ultrafast space-time domain emerges as an important  feature in modern spin-orbital optics, imaging and metrology, optical  informatics, and topological and quantum technologies.

【报告人简介】:

Yijie  Shen is an Assistant Professor in School of Physical and Mathematical Sciences  & School of Electrical and Electronic Engineering, Nanyang Technological  University. He was previously a Marie Curie Senior Research Fellow in Optoelectronics Research Centre,  University of Southampton, UK. He received the Ph.D. degree in optical  engineering at the Department of Precision Instrument, Tsinghua University,  China, in 2019. He received the B.S. degree in mechanical engineering and  automation from South China University of Technology, China, in 2015. During  Mar.-Jun. 2019, he was invited as a visiting researcher in School of Physics: Structured Light Laboratory, University  of the Witwatersrand, Johannesburg, South Africa. He was recognized as  members of the Chinese Optical Society, Chinese Society of Theoretical and  Applied Mechanics, Optical Society of America, the Wang Da-Heng Optics Award in  2019, an honorary Rosalind Member of London Journals Press in 2021. He has  published more than 70 papers in high-impact journals with  >3000 citations (H-index of 28).