Continuous-wave terahertz  diffraction tomography based on digital holography

Xiaoyu Jin; Jie Zhao; Dayong Wang; Yunxin Wang; Lu Rong

doi:10.1117/12.2599266

18 June 2021 Continuous-wave terahertz diffraction tomography based on digital holography

Xiaoyu Jin, Jie Zhao, Dayong Wang, Yunxin Wang, Lu Rong

Proceedings Volume 11850, First Optics Frontier Conference; 118500G (2021) https://doi.org/10.1117/12.2599266
Event: First Optics Frontier Conference, 2021, Hangzhou, China

Abstract

In this paper, we implemented diffraction tomography (DT) by using a continuous-wave (CW) terahertz (THz) source. An off-axis digital holographic interferometry was built to measure the complex amplitude distributions of the sample at various rotational angles. Based on the Rytov approximation, the three dimensional (3D) refractive index (RI) distribution of the polystyrene (PS) foam spheres was reconstructed by the filtered backpropagation (FBPP) algorithm. For enhancing the quality of the reconstructed RI tomograms, the auto-focusing algorithm was applied to correct the decentered error of the sample when placed on the rotation configuration. This study demonstrated that THz-DT can be applied to reconstruct the high-precision 3D RI distribution, which has extensive application prospects in 3D imaging and nondestructive testing.

Citation Download Citation

Xiaoyu Jin, Jie Zhao, Dayong Wang, Yunxin Wang, and Lu Rong "Continuous-wave terahertz diffraction tomography based on digital holography", Proc. SPIE 11850, First Optics Frontier Conference, 118500G (18 June 2021); https://doi.org/10.1117/12.2599266

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