On December 12, 2020, Associate professor Liu Fang was invited to deliver a report entitled "Free electron radiation based on micro-nano structure" at the symposium of "Integrated Optoelectronics and Optical Quantum Physics and Technology".

This symposium was sponsored by the State Key Laboratory of Artificial Microstructure and Mesoscopic Physics and held in the West Building of the School of Physics, Peking University. Prof. Gong Qihuang, executive Vice President of Peking University, director of the Academic Committee of state Key Laboratory of Artificial Microstructure and Mesoscopic Physics, attended the symposium. More than 20 experts and scholars and more than 80 teachers and students from 13 domestic research institutions and universities, such as Institute of Physics of Chinese Academy of Sciences, Microsystem of Chinese Academy of Sciences, Peking University, Tsinghua University, Zhejiang University, and so on, attended this meeting.