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Reconstruction of three-dimensional objects in layered composite structures from multimode orbital angular momentum.

Bingyang Liang1,2, Fei Shen1, Shao Meng Wang2

  • 1International School of Microelectronics, Dongguan University of Technology, Dongguan 523808, China.

Physical Review. E
|March 16, 2022
PubMed
Summary

Vortex electromagnetic waves carrying orbital angular momentum (OAM) enhance 3D object reconstruction in layered media. Using multiple OAM modes improves permittivity accuracy compared to traditional spherical waves.

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Area of Science:

  • Electromagnetics
  • Wave Physics
  • Computational Imaging

Background:

  • Vortex electromagnetic waves possess helical phase wavefronts, offering more information and degrees of freedom than spherical waves.
  • Orbital angular momentum (OAM) in vortex waves shows potential for improving inversion and imaging accuracy.

Purpose of the Study:

  • To investigate the reconstruction of 3D objects within layered composite structures using OAM-extended vortex waves.
  • To evaluate the impact of multiple OAM modes on the accuracy of target reconstruction.

Main Methods:

  • Forward modeling using a concentric uniform circle array to generate electromagnetic vortex beams.
  • Calculation of electric field and phase patterns for different OAM modes.
  • Scattered field determination via dyadic Green's function and stabilized biconjugate gradient with FFT.
  • Target reconstruction using the variational Born iterative method.

Main Results:

  • Multiple OAM modes significantly improve the reconstruction accuracy of target permittivity compared to traditional spherical waves.
  • Increasing the OAM mode number brings reconstructed target parameters closer to the true values.
  • Numerical results demonstrate the effectiveness of OAM in layered composite structure imaging.

Conclusions:

  • OAM-based vortex waves offer enhanced capabilities for 3D object reconstruction in layered media.
  • The study provides a better understanding of OAM's role in improving inversion and optical imaging technologies.
  • This research paves the way for advanced imaging techniques utilizing vortex waves.