Terahertz ptychography system using Gaussian beam as probe

YANG Shutao; YU Miao; ZHANG Mengting; YANG Zhen’gang; LIU Jinsong; WANG Kejia

doi:10.5768/JAO202142.0401001

Journal of Applied Optics > 2021 > 42(4): 571-576. > DOI: 10.5768/JAO202142.0401001

YANG Shutao, YU Miao, ZHANG Mengting, YANG Zhen’gang, LIU Jinsong, WANG Kejia. Terahertz ptychography system using Gaussian beam as probe[J]. Journal of Applied Optics, 2021, 42(4): 571-576. DOI: 10.5768/JAO202142.0401001

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Terahertz ptychography system using Gaussian beam as probe

1.
Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
2.
AVIC Beijing Changcheng Aeronautical Measurement and Control Technology Research Institute, Beijing 101111, China

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Received Date: March 01, 2021
Revised Date: March 31, 2021
Available Online: May 28, 2021

Graphical Abstract

Abstract

Abstract

In order to improve the disadvantages that the detection range is close and the probe beam is difficult to be used effectively in the traditional ptychography system, the terahertz ptychography experimental system based on focused Gaussian beam was proposed. Based on the principle of ptychography and using the angular spectrum transmission theory, a focused Gaussian beam was used to replace the diffracted beam generated by the traditional aperture. The feasibility of this replacement was verified through computer simulation experiments, and the corresponding imaging experiments were completed. The numerical simulation results show that it is feasible to carry out the terahertz ptychography using a focused Gaussian beam in the 0.1 THz band, and the simulation and experimental results verify the feasibility of the system. Under the condition of detection distance of 50 mm, the theoretical depth resolution reaches to λ/4, and the experimental system depth resolution is λ/2, which fully demonstrates the effectiveness of this ptychography system.
- terahertz ptychography,
- extended ptychographical iterative engine,
- angular spectrum theory,
- digital holography

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References (24)

References

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Terahertz ptychography system using Gaussian beam as probe