湖南大学“天马材料研究论坛”第157期
题 目：Interacting Light with Semiconductor at the Nanoscale
报告人：Dr. Wei Bao
地 点：工程实验大楼240、244 多媒体报告厅
时 间：2019年4月12日周五上午10：00-11：30
主持人：潘安练 教授
邀请人：材料科学与工程学院
承办人：材料学院“天马材料研究论坛”日常工作小组
报告人简介：
Dr. Wei Bao is an Assistant Professor in University of Nebraska- Lincoln. He was a postdoctoral researcher in Prof. Xiang Zhang’s lab at the University of California, Berkeley from 2015-2018. Previously he earned his B.A. in Physics (minor in Chemistry) at Peking University in 2009, and his M.S. in Mechanical Engineering (minor in Electrical Engineering) at UCLA in 2010. Wei then received his Ph.D. in Materials Science and Engineering (minor in Electrical Engineering) at University of California, Berkeley under the supervision of Prof. Miquel Salmeron and Prof. P. James Schuck in 2015. His Ph.D. work in nanoscale spectroscopic investigations of optoelectronic has led to several awards including: MRS Graduate Student Gold Award, Dorothy M. and Earl S. Hoffman Scholarships, Ross N. Tucker Memorial Award, as well as a R&D 100 Award 2013. His postdoc research focused on the interface between low-dimensional semiconductor nanophotonics and quantum physics.
SELECTED PUBLICATIONS
1. Wei Bao† et. al. “Mapping Local Charge Recombination Heterogeneity by Multidimensional
Nanospectroscopic Imaging”, Science, 338, 1317, (2012)
2. Wei Bao† et. al. “Visualizing nanoscale excitonic relaxation properties of disordered edges and grain boundaries in monolayer molybdenum disulfide” Nature Commun, (6) 7993 (2015)
3. Xiaoze Liu†, Wei Bao† et. al, “Control of coherently coupled exciton-polaritons in monolayer tungsten disulphide” Phys. Rev. Lett. 119 (2), 027403 (2017)
4. Rongkuo Zhao†, Lin Li†, Sui Yang†, Wei Bao†, Yang Xia, Yuan Wang, and Xiang Zhang, “Stable casimir equilibria and quantum trapping”, Science, In press, (2019)
5. Wei Bao†, et. al., “Observation of solid state Rydberg exciton polariton and its condensate in a perovskite cavity” (https://arxiv.org/abs/1803.07282) under revision in Nature Phys. (2019)
报告摘要：
The ability to probe and control light-matter interaction at the nanometer scale not only advances frontiers of fundamental science, but also is a critical prerequisite to device applications in electronics, sensing, catalysis, energy harvesting, and more. Exploiting and enhancing the originally weak light-matter interactions via nanofabricated photonic structures; we will be able to sense chemical species at single molecule levels, to devise better imaging and manufacturing tools, to transfer data more efficiently at higher speed.
In this talk, I will first describe a simple and general nano-optical device developed during my Ph.D., called campanile probe, which lay groundwork for generally-applicable nano-optical studies. Two examples will be discussed, where we cross the boundary from insufficient to sufficient resolution beyond optical diffraction limit and perform optical hyperspectral imaging of luminescence heterogeneity along InP nanowires and synthetic monolayer MoS2, providing spectral information distinct from diffraction limited micro-PL spectral imaging. Following this, I will discuss the recent works using cavities to further enhance the strength of light-matter interaction into the strong coupling regime. The formation of coherently coupled cavity exciton-polariton in two-dimensional monolayer WS2 and the inorganic perovskite CsPbBr3 as well as the ultralow threshold optically pumped polariton lasing in perovskite cavities will be shown. Finally, I will conclude by presenting my vision of how these devices can enable a wide range of capabilities with relevance to multidimensional spectroscopy imaging, efficient solid-state lighting and even beyond.
