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<p>This research provides theoretical and numerical analysis of the interaction of p-polarized electromagnetic waves with a collisional magnetized plasma at the vacuum-plasma interface. The plasma is represented as cold, homogeneous, and anisotropic, with collisional effects included by assuming a finite electron-ion collision frequency. Employing the full dielectric tensor formalism and expanding the fields in terms of circularly polarized eigenmodes, the reflection, transmission, and absorption properties of the wave are studied as functions of frequency, magnetic field strength, and plasma parameters. The analysis indicates that the left- and right-circularly polarized (LCP and RCP) modes have different behaviour due to their respective cyclotron resonances. Particularly, the LCP mode shows strong absorption at the lower hybrid frequency, while the RCP mode shows resonant behaviour and energy deposition at the upper hybrid frequency. For each mode, cutoff frequencies appear where the dielectric constant tends to zero, leading to total reflection. However, above these frequencies, the wave becomes transparent and is transmitted into the plasma, with the threshold frequency depending on the strength of the external magnetic field. With increasing strength of the magnetic field, the cutoff shifts, allowing wave propagation at lower frequencies that would otherwise be reflected—this effect is visible for both LCP and RCP modes. Collisional damping plays a major role in the deformation of these ideal cutoff and resonance boundaries. Finite collision frequencies cause broadened absorptance profiles, soften sharp reflectance transitions, and allow partial wave penetration even under classical cutoff conditions. The findings of our research show that absorptance reaches up to 50% near cyclotron and hybrid frequencies, especially under moderate collisionality conditions. In addition, we find that the wave gets more transparent i.e. the transmission coefficient increases under certain plasma or magnetic field conditions, allowing a larger portion of the incident electromagnetic power to pass through the plasma boundary even in highly reflecting regimes. All these findings are consistent with classical cold plasma theory and consistent with experimental trends in magnetized laboratory plasma devices, especially in THz and RF frequency regimes. The present research provides an integrated framework for describing the wave accessibility, mode selectivity, and energy coupling at plasma interfaces, which is of extreme importance to plasma heating, diagnostics, and wave-driven applications in fusion and space plasmas.</p>

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Circularly polarized mode analysis and RTA behaviour of p-polarized waves at a magnetized plasma boundary

  • 期刊论文

  • 发表日期：

    2026年3月7日

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  • Himank Sagar,
  • Suresh C. Sharma

摘要

This research provides theoretical and numerical analysis of the interaction of p-polarized electromagnetic waves with a collisional magnetized plasma at the vacuum-plasma interface. The plasma is represented as cold, homogeneous, and anisotropic, with collisional effects included by assuming a finite electron-ion collision frequency. Employing the full dielectric tensor formalism and expanding the fields in terms of circularly polarized eigenmodes, the reflection, transmission, and absorption properties of the wave are studied as functions of frequency, magnetic field strength, and plasma parameters. The analysis indicates that the left- and right-circularly polarized (LCP and RCP) modes have different behaviour due to their respective cyclotron resonances. Particularly, the LCP mode shows strong absorption at the lower hybrid frequency, while the RCP mode shows resonant behaviour and energy deposition at the upper hybrid frequency. For each mode, cutoff frequencies appear where the dielectric constant tends to zero, leading to total reflection. However, above these frequencies, the wave becomes transparent and is transmitted into the plasma, with the threshold frequency depending on the strength of the external magnetic field. With increasing strength of the magnetic field, the cutoff shifts, allowing wave propagation at lower frequencies that would otherwise be reflected—this effect is visible for both LCP and RCP modes. Collisional damping plays a major role in the deformation of these ideal cutoff and resonance boundaries. Finite collision frequencies cause broadened absorptance profiles, soften sharp reflectance transitions, and allow partial wave penetration even under classical cutoff conditions. The findings of our research show that absorptance reaches up to 50% near cyclotron and hybrid frequencies, especially under moderate collisionality conditions. In addition, we find that the wave gets more transparent i.e. the transmission coefficient increases under certain plasma or magnetic field conditions, allowing a larger portion of the incident electromagnetic power to pass through the plasma boundary even in highly reflecting regimes. All these findings are consistent with classical cold plasma theory and consistent with experimental trends in magnetized laboratory plasma devices, especially in THz and RF frequency regimes. The present research provides an integrated framework for describing the wave accessibility, mode selectivity, and energy coupling at plasma interfaces, which is of extreme importance to plasma heating, diagnostics, and wave-driven applications in fusion and space plasmas.