Abstract

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.

© 2021 Chinese Laser Press

Continuous-wave terahertz in-line holographic diffraction tomography with the scattering fields reconstructed by a physics-enhanced deep neural network

Xiaoyu Jin, Jie Zhao, Dayong Wang, John J. Healy, Lu Rong, Yunxin Wang, and Shufeng Lin
Photon. Res. 11(12) 2149-2158 (2023)

Three-dimensional refractive index estimation based on deep-inverse non-interferometric optical diffraction tomography (ODT-Deep)

Brad Bazow, Thuc Phan, Christopher B. Raub, and George Nehmetallah
Opt. Express 31(17) 28382-28399 (2023)

Holographic coherence tomography for measurement of three-dimensional refractive-index space

Yang Lu, Hua Lei, Qinmin Pan, Zhengdong Liu, and Garry L. Rempel
Opt. Lett. 27(13) 1102-1104 (2002)

Refractive-index measurement of gradient-index microlenses by diffraction tomography

Wolfgang Singer, Barbara Dobler, Horst Schreiber, Karl-Heinz Brenner, and Bernhard Messerschmidt
Appl. Opt. 35(13) 2167-2171 (1996)

Investigating the enhancement of three-dimensional diffraction tomography by using multiple illumination planes

Angelos T. Vouldis, Costas N. Kechribaris, Theofanis A. Maniatis, Konstantina S. Nikita, and Nikolaos K. Uzunoglu
J. Opt. Soc. Am. A 22(7) 1251-1262 (2005)