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

作　　者：Dayong Wang Xiaoyu Jin Jie Zhao Yunxin Wang Lu Rong John J.Healy 王大勇;金晓宇;赵洁;王云新;戎路;John J.Healy(College of Physics and Optoelectronics,Faculty of Science,Beijing University of Technology,Beijing 100124,China;Beijing Engineering Research Center of Precision Measurement Technology and Instruments,Beijing 100124,China;Beijing-Dublin International College,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]College of Physics and Optoelectronics,Faculty of Science,Beijing University of Technology,Beijing 100124,China [2]Beijing Engineering Research Center of Precision Measurement Technology and Instruments,Beijing 100124,China [3]Beijing-Dublin International College,Beijing University of Technology,Beijing 100124,China

出　　处：《Chinese Optics Letters》2021年第12期150-155,共6页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.62075001 and 61675010);the Science Foundation of Education Commission of Beijing(No.KZ202010005008);the Beijing Nova Program(No.XX2018072)。

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.

关 键 词：diffraction tomography three-dimensional terahertz imaging three-dimensional reconstruction algorithm refractive index measurement 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术] O441.4[自动化与计算机技术—计算机科学与技术]