3D-printed aberration-free terahertz metalens for ultra-broadband achromatic super-resolution wide-angle imaging with high numerical aperture

IF 14.7 1区 综合性期刊 Q1 MULTIDISCIPLINARY SCIENCES
Jin Chen, Shao-Xin Huang, Ka Fai Chan, Geng-Bo Wu, Chi Hou Chan
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引用次数: 0

Abstract

Terahertz (THz) lens constitutes a vital component in the THz system. Metasurfaces-based THz metalenses and classical bulky lenses are severely constrained by chromatic/ spherical aberration and the diffraction limit. Consequently, achromatic super-resolution THz lenses are urgently needed. In this study, through translating the required phase distribution into a refractive index (RI) profile with a specific thickness, an innovative approach to designing THz metalenses is proposed and achieved by dielectric gradient metamaterials. The samples fabricated by 3D printing can realize achromatic super focusing with a numerical aperture (NA) of 0.555 from 0.2 to 0.9 THz. Submillimeter features separated by approximately 0.2 mm can be resolved with high precision, such as glass fabric patterns within FR4 panels and fibrous tissue on leaves, with a field of view (FOV) of 90°. Our approach offers a feasible and cost-effective means to implement THz super-resolution imaging, which holds great potential in non-destructive testing and biomedical imaging.

Abstract Image

3d打印用于超宽带消色差超解析度广角成像的太赫兹超透镜
太赫兹透镜是太赫兹系统的重要组成部分。基于超表面的太赫兹超透镜和经典的大透镜受到色差/球差和衍射极限的严重限制。因此,消色差超分辨率太赫兹透镜是迫切需要的。在本研究中,通过将所需的相位分布转换为具有特定厚度的折射率(RI)剖面,提出了一种设计太赫兹超透镜的创新方法,并通过介电梯度超材料实现了这种方法。3D打印制备的样品在0.2 ~ 0.9 THz范围内的数值孔径(NA)为0.555,可实现消色差超聚焦。距离约0.2 mm的亚毫米特征可以以高精度分辨,例如FR4面板内的玻璃织物图案和叶子上的纤维组织,视场(FOV)为90°。我们的方法为实现太赫兹超分辨率成像提供了一种可行且具有成本效益的方法,在无损检测和生物医学成像方面具有很大的潜力。
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来源期刊
Nature Communications
Nature Communications Biological Science Disciplines-
CiteScore
24.90
自引率
2.40%
发文量
6928
审稿时长
3.7 months
期刊介绍: Nature Communications, an open-access journal, publishes high-quality research spanning all areas of the natural sciences. Papers featured in the journal showcase significant advances relevant to specialists in each respective field. With a 2-year impact factor of 16.6 (2022) and a median time of 8 days from submission to the first editorial decision, Nature Communications is committed to rapid dissemination of research findings. As a multidisciplinary journal, it welcomes contributions from biological, health, physical, chemical, Earth, social, mathematical, applied, and engineering sciences, aiming to highlight important breakthroughs within each domain.
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