作者：Chen Ruoxi, Chen Hongsheng, Lin Xiao；等
来源：SCIENCE ADVANCES 卷:9 期:32 页(号):eadh8098 出版时间:AUG 2023 .
We reveal a mechanism to enhance particle-matter interactions by exploiting the pseudo-Brewster effect of gain materials. This enhanced free-electron radiation is featured with ultrahigh directionality and appears always at the Brewster angle, regardless of the electron velocity. Counterintuitively, we further find that a weaker gain could lead to a stronger enhancement for light emission.
