Enhanced Smith–Purcell radiation by coupling surface plasmons on meta-films array with resonator modes on a grating
Enhanced Smith–Purcell radiation by coupling surface plasmons on meta-films array with resonator modes on a grating
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DOI：
10.1088/1361-6463/aaf467
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发表时间：
2018-12
期刊：
影响因子：
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通讯作者：
Weihao Liu;Yucheng Liu;Q. Jia;Yalin Lu
中科院分区：
文献类型：
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作者：
Weihao Liu;Yucheng Liu;Q. Jia;Yalin Lu
我们建议使用均匀运动的自由电子来激发交替排列的超材料薄膜(元薄膜)和开放谐振器阵列。金属薄膜上的表面等离子体激元和开腔内的谐振模都被激发，并且在开腔中相互耦合。这种耦合显著增加了共振模的强度，从而产生了增强的相干Smith-Purcell辐射(SPR)。与传统的SPR相比，该方案结合了材料和结构的优点，其辐射功率提高了一个数量级以上。因此，它为开发高效的太赫兹源提供了一条很有前途的途径。
We propose to use uniformly moving free-electrons to excite an array of alternatedly lined metamaterial thin-films (meta-films) and open-resonators. The surface plasmon polaritons on meta-films and the resonant modes within open-resonators are both excited, and are coupled to each other in the open-resonators. This coupling remarkably increases the intensities of resonant modes, which then generate enhanced coherent Smith–Purcell radiation (SPR). Compared with conventional SPRs, the present scheme combines the advantages of both material and structure profile, and its radiation power is more than an order of magnitude higher. Thus it offers a promising way for developing efficient terahertz sources.