Broadband achromatic metalens in terahertz regime

doi:10.1016/j.scib.2019.08.004

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	Broadband achromatic metalens in terahertz regime
	Q.Q.Cheng; M.L.Ma; D.Yu; Z.X.Shen; J.Y.Xie; J.C.Wang; N.X.Xu
	2019
发表期刊	Science Bulletin
ISSN	2095-9273
卷号	64 期号:20 页码:1525-1531
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.
关键词	Far infrared or terahertz,Achromatic,Metasurface,Diffraction theory,dielectric metasurfaces,phase discontinuities
DOI	10.1016/j.scib.2019.08.004
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收录类别	SCI ; EI
语种	英语
引用统计
文献类型	期刊论文
条目标识符	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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