Continuous-wave terahertz phase-contrast imaging

Dayong Wang; Lu Rong; Changchao Zhai; Yunxin Wang; Jie Zhao; Jinxin Guo

doi:10.1117/12.2309947

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24 May 2018 Continuous-wave terahertz phase-contrast imaging

Dayong Wang, Lu Rong, Changchao Zhai, Yunxin Wang, Jie Zhao, Jinxin Guo

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Proceedings Volume 10677, Unconventional Optical Imaging; 106771X (2018) https://doi.org/10.1117/12.2309947
Event: SPIE Photonics Europe, 2018, Strasbourg, France

Abstract

We introduced two continuous-wave terahertz iterative phase-contrast imaging methods. In-line digital holography has the capability to reconstruct the amplitude and phase distributions simultaneously. It is a non-destructive, high-resolution, full-field dynamic phase-contrast imaging technique. Ptychography can reconstruct the complex amplitude distribution of the transmission object from the overlapped diffraction patterns. Both methods can achieve phase-contrast imaging, and are suitable for terahertz region. In this paper, both Gabor in-line holographic and ptychographical configurations are investigated from algorithms to experiments. For in-line holography, the use of extrapolation, synthetic aperture, sub-pixel shifting and multi-plane imaging are introduced to improve the resolution and reconstruction accuracy. For ptychography, we obtained the ptychographical reconstruction results of a polypropylene alphabet sample, which provides a new imaging method for terahertz phase-contrast imaging.

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Dayong Wang, Lu Rong, Changchao Zhai, Yunxin Wang, Jie Zhao, and Jinxin Guo "Continuous-wave terahertz phase-contrast imaging", Proc. SPIE 10677, Unconventional Optical Imaging, 106771X (24 May 2018); https://doi.org/10.1117/12.2309947

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