用于太赫兹二维和三维成像的特殊表面组件打印。

Printing special surface components for THz 2D and 3D imaging.

作者信息

Yan Bo, Wang Zhigang, Zhao Xing, Lin Lie, Wang Xiaolei, Gong Cheng, Liu Weiwei

机构信息

School of Electronic Engineering, University of Electronic Science and Technology, Chengdu, 611731, China.

Institute of Modern Optics, Tianjin Key Laboratory of Micro-Scale Optical Information Science and Technology, Nankai University, Tianjin, 300350, China.

出版信息

Sci Rep. 2020 Nov 30;10(1):20867. doi: 10.1038/s41598-020-77998-9.

DOI:10.1038/s41598-020-77998-9

PMID:33257752

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7705669/

Abstract

The paper reports an off-axis large focal depth THz imaging system which consists of three 3D printed special surface components (two aspherical mirrors and an axicon). Firstly, the optical design software is used to design and optimize the aspherical parabolic mirror. Secondly, the optimized mirror is prepared by a 3D printing and metal cladding method. Thirdly, a THz axicon is designed for generation of quasi-Bessel Beam and a new geometric theoretical model of oblique incident light for axicon is established. Finally, the imaging system based on the special surface components is constructed. Its maximum diffraction-free distance is about 60 mm, which is 6 times higher than the traditional system. To verify the effectiveness, THz two-dimensional imaging experiments and three-dimensional computed tomography experiment are carried out. The results are consistent with the design and calculations.

摘要

该论文报道了一种离轴大焦深太赫兹成像系统，它由三个3D打印的特殊表面部件（两个非球面镜和一个轴棱锥）组成。首先，利用光学设计软件对非球面抛物面镜进行设计和优化。其次，通过3D打印和金属包覆方法制备优化后的镜子。第三，设计了一种用于产生准贝塞尔光束的太赫兹轴棱锥，并建立了一种新的轴棱锥斜入射光几何理论模型。最后，构建了基于特殊表面部件的成像系统。其最大无衍射距离约为60毫米，比传统系统高6倍。为验证其有效性，进行了太赫兹二维成像实验和三维计算机断层扫描实验。结果与设计和计算结果一致。