Abstract-Probe position correction based on overlapped object wavefront cross-correlation for continuous-wave terahertz ptychography

Lu Rong, Chao Tang, Dayong Wang, Bing Li, Fangrui Tan, Yunxin Wang, and Xiaoyu Shi

Fig. 1 A schematic representation of the proposed algorithm. If the initial probe position is determined, the following probe positions are successively estimated by Eqs. (2) – (5).

https://www.osapublishing.org/oe/abstract.cfm?uri=oe-27-2-938

Continuous-wave terahertz ptychography is a promising large field-of-view lensless terahertz phase imaging method. Inaccurate probe positions would severely degrade the reconstruction quality, as compared to other spectral bands. In this paper, we propose a probe position correction method based on cross-correlation registration on overlapped regions of the object wavefront for terahertz ptychography. The translation errors could be minimized in the order of 0.01 pixels. The simulation results suggest good computational efficiency, correction, and reconstruction accuracy. We perform continuous-wave terahertz ptychography on a cicada’s forewing. The subcosta and the first radius vein are distinguished after position correction. The probe position distribution reveals that the tilt angle between the object plane and the recording plane is 0.26°.

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