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Photonic crystals, due to their unique band structures in momentum space, enable the flexible manipulation of electromagnetic wave propagation. Recent advancements in the study of photonic crystal band structures have revealed the existence of momentum-space polarization fields analogous to vector light fields. These polarization fields correspond to the projection of Bloch states in the far field onto the sample plane, as dictated by the band structures. The compactness and rich topological configurations of the polarization fields have been thoroughly demonstrated in both theoretical and experimental studies. This presentation will detail the experimental and theoretical research conducted by the Photonic Crystal Research Group at Fudan University in recent years, focusing on momentum-space polarization fields in photonic crystals. Key topics include: the relationship between momentum-space polarization fields and bound states in the continuum, high-polarization coherent radiation and vector light field lasing, wavefront vortex phase manipulation and polarization-dependent beam displacement, momentum-space lenses capable of forming upright real images, and the realization of spatiotemporal vortices in momentum-frequency space. These studies present novel approaches and methodologies for light manipulation based on band structures of photonic crystals.
Lei Shi: Director of the Undergraduate Admissions Office at Fudan University, Associate Dean of the Undergraduate School at Fudan University, Professor in the Department of Physics at Fudan University, Ph.D. supervisor, Zhongying Young Scholar of Fudan University, Eastern Scholar Professor, Shanghai Outstanding Technology Leader, Changjiang Scholar Distinguished Professor, and Principal Investigator of the National Key R&D Program of China. He has been awarded the 11th China Technology Market Association Golden Bridge Award for Outstanding Contribution (Individual), the 2022 China Industry-University-Research Cooperation Innovation and Promotion Award (Individual), and the 2023 Shanghai Natural Science First Prize (second contributor).
Tencent meeting link: https://meeting.tencent.com/dm/QOrayiAYiiv6 Meeting ID: 363 788 019, no password