Threshold-less Cherenkov radiation in hyperbolic metamaterial

被引:0
|
作者
Liu, Fang [1 ]
Huang, Yidong [1 ]
机构
[1] Tsinghua Univ, Dept Elect Engn, Tsinghua Natl Lab Informat Sci & Technol, Beijing 100084, Peoples R China
来源
SMART PHOTONIC AND OPTOELECTRONIC INTEGRATED CIRCUITS XX | 2018年 / 10536卷
基金
中国国家自然科学基金;
关键词
Cherenkov radiation; Free electron light source; Integrated optoelectronic device;
D O I
10.1117/12.2293363
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
To generate Cherenkov radiation (CR) in natural medium, the electron energy threshold is higher than hundreds of keV. Even though various approaches were adopted, the high-energy electrons as high as tens of keV is still required in experiment. Here we proposed to eliminate the threshold of electron energy to generate CR with the help of hyperbolic metamaterial (HMM). The analytical and simulation results indicate that, even though electron energy is lower than 0.1keV, the CR could be obtained in HMM in a visible and near-infrared frequency region. Further, the on-chip integrated threshold-less CR source, consisted with a planar electron emitter, Au-SiO2 multilayers HMM, and periodic metal nano-slits, has been realized. It is demonstrated that, with low-energy electrons (0.25-1.4keV), the CR is generated covering lambda(0)=500 similar to 900nm. The electron energy generating CR experimentally is two similar to three orders of magnitude lower than that in natural media and artificial structures. As we know, this is the first on-chip integrated free electron light source benefiting from the threshold-less CR. Although less than 1% of the light energy could be coupled to free space, the total output light power still reaches 200nW, which is two orders of magnitude higher than free electron light source by using other nanostructures.
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页数:6
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