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<p>A theoretical study of electromagnetic scattering under illumination of a complex conjugate medium (CCM) sphere with a focused Bessel light beam with linearly polarization using the generalized Lorenz-Mie theory (GLMT) is presented. The characteristics of CCM are associated with a real refractive index and consequently considered a lossless medium. The electromagnetic fields (incident, scattered, and transmitted) are constructed using beam shape coefficients (BSCs) and spherical vector wave functions (SVWFs). The unknown coefficients in the scattered fields are calculated by implementing the continuous boundary conditions (BCs). Expressions for the optical efficiencies (extinction, scattering, absorption, forward scattering, and back scattering) are computed. The impacts of beam polarization, the beam half-cone angle, relative permittivity, and relative permeability are analyzed. Inferred from numerical results, beam configuration parameters have a significant impact on the optical efficiencies. Therefore, by selecting appropriate beam parameters, we can tune the efficiency factors caused by the CCM sphere. The results provided a strong background for studying the electromagnetic scattering of non-diffracting beams by metamaterial structures.</p>

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Scattering analysis and optical efficiencies of a complex conjugate medium (CCM) sphere illuminated by a non-diffracting linearly polarized Bessel beam

  • 期刊论文

  • 发表日期：

    2025年7月7日

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  • Muhammad Arfan,
  • Muhammad Asif,
  • Saad Althobaiti,
  • Saeed Althubiti,
  • Ali Althobaiti,
  • Renxian Li,
  • Huan Tang,
  • Ruiping Yang

摘要

A theoretical study of electromagnetic scattering under illumination of a complex conjugate medium (CCM) sphere with a focused Bessel light beam with linearly polarization using the generalized Lorenz-Mie theory (GLMT) is presented. The characteristics of CCM are associated with a real refractive index and consequently considered a lossless medium. The electromagnetic fields (incident, scattered, and transmitted) are constructed using beam shape coefficients (BSCs) and spherical vector wave functions (SVWFs). The unknown coefficients in the scattered fields are calculated by implementing the continuous boundary conditions (BCs). Expressions for the optical efficiencies (extinction, scattering, absorption, forward scattering, and back scattering) are computed. The impacts of beam polarization, the beam half-cone angle, relative permittivity, and relative permeability are analyzed. Inferred from numerical results, beam configuration parameters have a significant impact on the optical efficiencies. Therefore, by selecting appropriate beam parameters, we can tune the efficiency factors caused by the CCM sphere. The results provided a strong background for studying the electromagnetic scattering of non-diffracting beams by metamaterial structures.