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Printing special surface components for THz 2D and 3D imaging.

Bo Yan1, Zhigang Wang1, Xing Zhao2

  • 1School of Electronic Engineering, University of Electronic Science and Technology, Chengdu, 611731, China.

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Summary
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This study introduces an advanced terahertz (THz) imaging system using 3D-printed components for a significantly larger focal depth. The novel off-axis design enhances diffraction-free imaging distance by six times compared to traditional systems.

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Area of Science:

  • Optics and Photonics
  • Terahertz (THz) Imaging Technology
  • Additive Manufacturing

Background:

  • Traditional terahertz (THz) imaging systems often suffer from limited focal depth, restricting their application in high-resolution 3D imaging.
  • Off-axis optical designs can mitigate aberrations but require specialized components for effective beam manipulation.
  • 3D printing offers a promising avenue for fabricating complex optical surfaces required for advanced imaging systems.

Purpose of the Study:

  • To develop and demonstrate an off-axis THz imaging system with an extended focal depth.
  • To leverage 3D printing for the fabrication of specialized optical components, including aspherical mirrors and an axicon.
  • To establish a new theoretical model for axicon performance under oblique incidence.

Main Methods:

  • Optical design and optimization of aspherical parabolic mirrors using specialized software.
  • Fabrication of optimized mirrors via 3D printing and metal cladding.
  • Design of a THz axicon for quasi-Bessel beam generation and development of a theoretical model for oblique incidence.
  • Construction of the off-axis THz imaging system incorporating the custom components.

Main Results:

  • The constructed THz imaging system achieved a maximum diffraction-free distance of approximately 60 mm.
  • This represents a six-fold increase in the diffraction-free distance compared to conventional THz imaging systems.
  • Experimental validation through 2D THz imaging and 3D computed tomography confirmed the system's effectiveness and design accuracy.

Conclusions:

  • The developed off-axis THz imaging system, utilizing 3D-printed aspherical mirrors and an axicon, significantly enhances imaging depth.
  • The novel system design and fabrication method provide a substantial improvement over traditional THz imaging capabilities.
  • The successful experimental results validate the potential of this approach for advanced THz applications.