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Broadband achromatic metalens in terahertz regime
文献类型：期刊论文
| 作者 | Q.Q.Cheng; M.L.Ma; D.Yu; Z.X.Shen; J.Y.Xie; J.C.Wang; N.X.Xu |
| 刊名 | Science Bulletin
 |
| 出版日期 | 2019 |
| 卷号 | 64期号:20页码:1525-1531 |
| 关键词 | Far infrared or terahertz,Achromatic,Metasurface,Diffraction theory,dielectric metasurfaces,phase discontinuities |
| ISSN号 | 2095-9273 |
| DOI | 10.1016/j.scib.2019.08.004 |
| 英文摘要 | Achromatic focusing is essential for broadband operation, which has recently been realised from visible to infrared wavelengths using a metasurface. Similarly, multi-terahertz functional devices can be encoded in a desired metasurface phase profile. However, metalenses suffer from larger chromatic aberrations because of the intrinsic dispersion of each unit element. Here, we propose an achromatic metalens with C-shaped unit elements working from 0.3 to 0.8 THz with a bandwidth of approximately 91% over the centre frequency. The designed metalens possesses a high working efficiency of more than 68% at the peak and a relatively high numerical aperture of 0.385. We further demonstrate the robustness of our C-shaped metalens, considering lateral shape deformations and deviations in the etching depth. Our metalens design opens an avenue for future applications of terahertz meta-devices in spectroscopy, time-of-flight tomography and hyperspectral imaging systems. (C) 2019 Science China Press. Published by Elsevier B.V. and Science China Press. All rights reserved. |
| URL标识 | 查看原文 |
| 语种 | 英语 |
| 源URL | [http://ir.ciomp.ac.cn/handle/181722/63434]  |
| 专题 | 中国科学院长春光学精密机械与物理研究所 |
| 推荐引用方式 GB/T 7714 | Q.Q.Cheng,M.L.Ma,D.Yu,et al. Broadband achromatic metalens in terahertz regime[J]. Science Bulletin,2019,64(20):1525-1531. |
| APA | Q.Q.Cheng.,M.L.Ma.,D.Yu.,Z.X.Shen.,J.Y.Xie.,...&N.X.Xu.(2019).Broadband achromatic metalens in terahertz regime.Science Bulletin,64(20),1525-1531. |
| MLA | Q.Q.Cheng,et al."Broadband achromatic metalens in terahertz regime".Science Bulletin 64.20(2019):1525-1531. |
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