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Laser & Optoelectronics Progress, Volume. 61, Issue 10, 1011009(2024)

Surface Scattering and Imaging Characteristics of Rough Targets in Low-Frequency Terahertz Band

Xinyue Chai1, Hao Hu1, Xiaoxue Hu1, Xinru Ma1, Sixing Xi2, and Xiaolei Wang1、*
Author Affiliations
  • 1Institute of Modern Optics, College of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, China
  • 2School of Mathematics and Physics Science and Engineering, Hebei University of Engineering, Handan 056038, Hebei, China
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    AbstractGet PDF(in Chinese)
    Figures&Tables (8)
    Equations (14)
    References (26)
    Cited By (2)
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    Figures & Tables(8)
    Flowchart of genetic algorithm

    Fig. 1. Flowchart of genetic algorithm

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    Fitting of Al relative permittivity. (a) Fitness function evolution curves of real and imaginary parts; (b) fitting results

    Fig. 2. Fitting of Al relative permittivity. (a) Fitness function evolution curves of real and imaginary parts; (b) fitting results

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    Variation of σHH with different factors under different surface roughness. (a) Scattering angle θs; (b) frequency f

    Fig. 3. Variation of σHH with different factors under different surface roughness. (a) Scattering angle θs; (b) frequency f

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    Rough target model. (a) (b) (c) Different surface roughness; (d) top view

    Fig. 4. Rough target model. (a) (b) (c) Different surface roughness; (d) top view

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    Target RCS with different surface roughness. (a)δ=0.2λ,l=3λ; (b) δ=0.2λ,l=2λ; (c)δ=0.6λ,l=2λ

    Fig. 5. Target RCS with different surface roughness. (a)δ=0.2λ,l=3λ; (b) δ=0.2λ,l=2λ; (c)δ=0.6λ,l=2λ

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    Full angle RCS for different rough conditions. (a) Same l, different δ; (b) same δ, different l

    Fig. 6. Full angle RCS for different rough conditions. (a) Same l, different δ; (b) same δ, different l

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    Imaging results and scattering center diagrams of targets with different surface roughness. (a) (d) δ=0.2λ,l=3λ; (b) (e) δ=0.2λ,l=2λ; (c) (f) δ=0.6λ,l=2λ

    Fig. 7. Imaging results and scattering center diagrams of targets with different surface roughness. (a) (d) δ=0.2λ,l=3λ; (b) (e) δ=0.2λ,l=2λ; (c) (f) δ=0.6λ,l=2λ

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    • Table 1. Model parameters and relative errors of real and imaginary parts at different fitting frequencies

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      Table 1. Model parameters and relative errors of real and imaginary parts at different fitting frequencies

      Fitted frequency point /THzCollision frequency /cm-1Plasma frequency /cm-1Real part relative errorImaginary part relative error
      0.114.68913.2128×1030.01220.1532
      0.314.33373.2163×1030.01150.1626
      0.513.16142.8568×1030.08630.3178
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    Xinyue Chai, Hao Hu, Xiaoxue Hu, Xinru Ma, Sixing Xi, Xiaolei Wang. Surface Scattering and Imaging Characteristics of Rough Targets in Low-Frequency Terahertz Band[J]. Laser & Optoelectronics Progress, 2024, 61(10): 1011009

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    Paper Information

    Category: Imaging Systems

    Received: Oct. 12, 2023

    Accepted: Dec. 21, 2023

    Published Online: May. 9, 2024

    The Author Email: Xiaolei Wang (wangxiaolei@nankai.edu.cn)

    DOI:10.3788/LOP232282

    CSTR:32186.14.LOP232282

    Topics

    laser devices and laser physics
    Lasers and Laser Optics
    Laser physics
    laser manufacturing
    Instrumentation, Measurement and Metrology