Abstract
We propose an orientation-dependent polarization manipulation by Cherenkov radiation (CR) in a silicon-on-insulator (SOI) waveguide with a metasurface. By putting an electron bunch passing near the SOI waveguide, CR excites the fundamental TE-like mode with ultra-high mode purity. The spin state of the decoupled light is determined by the direction of the electron motion, and the maximum magnitude of the normalized Stokes polarization parameter $ {S_3} $ approaches $ \pm 1 $, corresponding to the right and left circularly polarized light. This Letter provides a new, to the best of our knowledge, way to achieve CR with spin angular momentum in an SOI waveguide and offers a platform to study the interaction between an electron and light with nanostructures on-chip.
© 2020 Optical Society of America
Full Article | PDF ArticleMore Like This
Wenxia Xu, Wenjia Li, Yehan Wang, Chunhua Qin, Botian Sun, Chunying Guan, Jianlong Liu, and Jinhui Shi
Opt. Lett. 49(7) 1840-1843 (2024)
Shimin Jiang, Weiwei Li, Zhigang He, Qika Jia, and Lin Wang
Opt. Lett. 45(19) 5416-5419 (2020)
Xijun Wu, Yue Feng, Chunyao Zhang, and H. L. Liu
Opt. Lett. 47(7) 1794-1797 (2022)