Spiral field generation in Smith-Purcell radiation by helical metagratings

• Main Authors: Jing, Liqiao, Wang, Zuojia, Lin, Xiao, Zheng, Bin, Xu, Su, Shen, Lian, Yang, Yihao, Gao, Fei, Chen, Min, Chen, Hongsheng
• Other Authors: School of Physical and Mathematical Sciences
• Format: Article
• Language: English
• Published: 2020
• Subjects: Science::Physics; Angular Momentum; Dipole
• Online Access: https://hdl.handle.net/10356/145513
• Institution: Nanyang Technological University

Moving electrons interacting with media can give rise to electromagnetic radiations and has been emerged as a promising platform for particle detection, spectroscopies, and free-electron lasers. In this letter, we investigate the Smith-Purcell radiation from helical metagratings, chiral structures s...