报告题目:Threshold-less Cherenkov radiation in hyperbolic metamaterial

报  告  人:刘仿,清华大学电子系

报告时间:2019-01-15 10:00

报告地点:物理系理科楼C302

报告摘要: Cherenkov radiation (CR) is the electromagnetic wave generated by moving charges passing through a dielectric medium with velocity larger than a certain threshold. To generate CR in natural medium, the electron energy should be as large as hundreds to thousands of keV. We demonstrate in hyperbolic metamaterial that there is no velocity threshold for electron to generate CR. Based on this threshold-less CR, the first on-chip integrated free electron light source was realized. This work opens up the possibility of exploring high performance on-chip integrated free-electron optoelectronic devices.