Continuous-wave terahertz diffraction tomography for measuring three-dimensional refractive index maps

被引：0
|
作者：
王大勇 [1 ,2 ]
金晓宇 [1 ]
赵洁 [1 ,2 ]
王云新 [1 ,2 ]
戎路 [1 ,2 ]
John J.Healy [3 ]
机构：
[1] College of Physics and Optoelectronics Faculty of Science Beijing University of Technology
[2] Beijing Engineering Research Center of Precision Measurement Technology and Instruments
[3] Beijing-Dublin International College Beijing University of Technology
来源：
ChineseOpticsLetters | 2021年 / 19卷 / 12期
基金：
中国国家自然科学基金;
关键词：
D O I：
暂无
中图分类号：
TP391.41 []; O441.4 [电磁波与电磁场];
学科分类号：
080203 ; 0809 ;
摘要：
Three-dimensional(3D) refractive index(RI) distribution is important to reveal the object’s inner structure. We implemented terahertz(THz) diffraction tomography with a continuous-wave single-frequency THz source for measuring 3D RI maps. The off-axis holographic interference configuration was employed to obtain the quantitative scattered field of the object under each rotation angle. The 3D reconstruction algorithm adopted the filtered backpropagation method, which can theoretically calculate the exact scattering potential from the measured scattered field. Based on the Rytov approximation, the 3D RI distribution of polystyrene foam spheres was achieved with high fidelity, which verified the feasibility of the proposed method.
引用
收藏
页码：155 / 160
页数：6
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