Ultra-Wideband Low-Loss Control of Terahertz Scatterings via an All-Dielectric Coding Metasurface
Ultra-Wideband Low-Loss Control of Terahertz Scatterings via an All-Dielectric Coding Metasurface
复制标题
通过全电介质编码超表面对太赫兹散射进行超宽带低损耗控制
DOI：
10.1021/acsaelm.0c00107
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发表时间：
2020
影响因子：
4.7
通讯作者：
Yao Jianquan
中科院分区：
文献类型：
--
作者：
Yang Maosheng;Yan Xin;Zhang Zhang;Gao Ju;Liang Lanju;Guo Xinyue;Li Jie;Wei Dequan;Wang Meng;Ye Yunxia;Song Xiaoxian;Zhang Haiting;Ren Yunpeng;Ren Xudong;Yao Jianquan
尽管通过金属超颖表面控制太赫兹（THz）散射的兴趣越来越大，但是避免由光与声子或自由电子之间的相互作用引起的欧姆损耗仍然是一项艰巨的任务。在此，我们提出了一种新的超宽带低损耗控制太赫兹散射的全介质编码元表面（DCMF）的方法。在我们的实验中，DCMFs操纵太赫兹波在900 GHz的超宽带显着。当太赫兹波进入DCMF时，它分裂成两束光，高振幅的透射率高达60%，低振幅的透射率约为30%。在我们的模拟中，高幅度的传输甚至可以达到99%。此外，编码序列的变化使得太赫兹散射的操作多样化。值得注意的是，具有序列“101010.将1.3太赫兹的光束折射到两个方向。主光束的能量似乎向各个方向消散。我们还发现，当1.63 THz的光束通过由“110110..它的能量可以向多个方向散射，展示了对太赫兹散射的前所未有的控制。研究结果不仅丰富了THz调制策略，而且对THz器件的上级设计具有指导意义。
Despite the growing interests for controlling terahertz (THz) scatterings via metallic metasurfaces, the avoidance of Ohmic loss resulting from the interaction between light and phonons or free electrons remains an arduous task. Herein, we propose a new approach of ultra-wideband low-loss control of THz scatterings via an all-dielectric coding metasurface (DCMF). In our experiments, the DCMFs manipulate THz waves remarkably in an ultra-wideband of 900 GHz. When a THz wave enters into the DCMFs, it emerges split into two beams with a higher amplitude of transmission up to 60% and the lower amplitude about 30%. In our simulations, the high amplitude of transmission may even reach 99%. Besides, the variation of coding sequence enables diversification of manipulation for THz scatterings. Notably, the DCMF with the sequence of “101010...” refracts a beam of 1.3 THz in two directions. The energy of the main beam seems to dissipate in all directions. We also find that as a beam of 1.63 THz passes through the DCMFs consisting of the sequence of “110110...”, its energy may scatter in multiple directions, demonstrating an unprecedented control of THz scatterings. Our results not only enrich the strategy of THz modulation but also guide the superior design for THz devices.