Robust asymmetric Cherenkov radiation in tilted anisotropic medium

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.