Robust asymmetric Cherenkov radiation in tilted anisotropic medium

• Published in: Science China. Physics, mechanics & astronomy Vol. 67; no. 1; p. 214211
• Main Authors: Xue, Shuwen, Xu, Yadong, Han, Linkang, Chen, Zhi Ning, Bao, Qiaoliang, Zhu, Shan, Chen, Huanyang
• Format: Journal Article
• Language: English
• Published: Beijing Science China Press 2024; Springer Nature B.V
• Subjects: Anisotropic media; Anisotropy; Astronomy; Asymmetry; Cerenkov radiation; Charged particles; Classical and Continuum Physics; Efficiency; Electric fields; Fabrication; Far fields; Observations and Techniques; Physical sciences; Physics; Physics and Astronomy; Radiation; Radiation sources; Velocity; intrinsic losses; asymmetric Cherenkov radiation; long-distance radiation
• ISSN: 1674-7348; 1869-1927
• DOI: 10.1007/s11433-023-2216-1

Cherenkov radiation (CR) is available for a wide variety of terahertz (THz) radiation sources, but its efficiency is deeply affected by intrinsic losses. We find that if the tilted angle ( α ) of anisotropic material and radiation angle ( θ ) meet the condition of θ + α = π /2, the intensity of radiation fields for the charged particle bunch (CPB) moving from left to right cannot be influenced by intrinsic losses, which means long-distance radiation can be achieved. Furthermore, we observe an asymmetric CR when the CPB moves from the opposite direction. In addition, we select natural van der Waals (vdW) material α -MoO 3 as an example, further confirming that the radiation field can reach the far field and the asymmetric CR radiation can also be observed. These wonderful properties with long-distance radiation will extend the application of CR to a certain extent for future design and fabrication.