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Abstract
Energy absorption of electromagnetic (EM) waves in collisional dusty plasmas is attracting much attention from researchers due to its applications in many fields, such as plasma antennas, blackout research during reentry, plasma stealth technology, and the design of microwave transmission in plasmas. In this paper, the propagation characteristics, in particular, the energy absorption effects of EM waves in partially ionized unmagnetized collisional dusty plasmas, are investigated. The results show that the effective energy absorption of EM waves is mainly due to the interaction between electrons and waves, and the plasmas with proper collisional frequencies can be used as a broadband frequency EM wave absorption medium with moderate absorption efficiency. Quantitative analyses of the characteristics of the EM waves that propagate in the collisional dusty plasmas are also included in this study.
Highlights
Based on the model described above, simulations are performed to investigate the influences of the dusty plasma components and the collisional frequency between electrons and neutral gases on the energy absorption effects of the electromagnetic waves
The energy absorption effect of the EM wave becomes stronger with the increase of slab thickness, and the peak of energy absorption appears at the position where the collisional frequency is close to the EM wave frequency (ω0) due to the resonance absorption effect as described previously
This paper presents the typical results of the energy absorption effects of electromagnetic waves in collisional dusty plasmas
Summary
Ionized unmagnetized collisional dusty plasmas have the features of high collisional frequency, adjusted percentage of electrons and other negative particles, high number density of atoms/molecules, and so on. Such characteristics make them widely applicable in many research fields, including the interaction with electromagnetic (EM) waves, materials processing, and plasma-biotechnology. The propagation of EM waves in such plasmas has attracted much attention from researchers in the past decades because many applications, such as plasma stealth of hypersonic vehicles and plasma antenna technologies, are related to such research. For example, the air around a spacecraft surface is at high temperature and it is ionized to form a plasma slab during reentry at high speed in the near space, and the interaction between the plasma slab and the EM wave will seriously interfere or even completely block the vehicle communication; the blackout phenomenon is formed. Ionized unmagnetized collisional dusty plasmas have the features of high collisional frequency, adjusted percentage of electrons and other negative particles, high number density of atoms/molecules, and so on.. Ionized unmagnetized collisional dusty plasmas have the features of high collisional frequency, adjusted percentage of electrons and other negative particles, high number density of atoms/molecules, and so on.1–3 Such characteristics make them widely applicable in many research fields, including the interaction with electromagnetic (EM) waves, materials processing, and plasma-biotechnology.. The physical characteristics of such a phenomenon can be attributed to the issue of EM wave propagation in high number density, weakly ionized, and nonmagnetized collisional dusty plasmas.. The key physical propagation process of EM waves in collisional dusty plasmas is considered and calculations on the energy absorption effects are performed.
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