Propagation of terahertz waves in nonuniform plasma slab under “electromagnetic window”

Li, Hao; Zhang, Zhengping; Yang, Xin

doi:10.1088/1674-1056/ac1b90

Cited by 5 publications

(3 citation statements)

References 31 publications

(32 reference statements)

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“…Chen et al [11] investigated the transmission characteristics of electromagnetic waves in plasma sheaths at different angles of incidence by using the improved scattering matrix method (ISMM). Hao Li theoretically analyzed and calculated the transmission behavior of terahertz waves at different electron densities, magnetic field distributions, and collision frequencies using the scattering matrix method (SMM) [12].…”

Section: Introductionmentioning

confidence: 99%

Terahertz wave propagation characteristics in SMM-based three-dimensional plasma fluid

Zhang,

Wang,

et al. 2024

Phys. Scr.

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During the return to the atmosphere of a hypersonic vehicle in adjacent space, a plasma sheath forms on the surface of the vehicle, which blocks normal electromagnetic communications. The "blackout" phenomenon caused by plasma sheaths has received much attention. This paper focuses on the American RAM-C vehicle as the research object, and utilizes the fluid simulation software USim to numerically simulate the pressure, temperature, and electron density under different flight conditions, and based on the simulation results, selects the appropriate electron density and plasma collision frequency, introduces the terahertz (THz) wave, and adopts the scattering matrix method (SMM) to study the propagation characteristics of the vertically incident non-uniform magnetized plasma with the terahertz wave. Among other things, the transmission characteristics of terahertz waves in the plasma are affected by the flight altitude and flight angle of attack of the vehicle. The conclusions indicate that the transmissivity of terahertz wave transmission in plasma increases, and the reflectivity and absorptance decrease with increasing flight altitude and flight angle of attack. Under the condition of controlling other flight parameters unchanged, the plasma frequency and collision frequency decrease with the increase of flight altitude. The larger the flight angle of attack is, the larger the plasma frequency and collision frequency are. The electron density on the wall surface of the vehicle was also tested, and it was found that the lowest electron density was found at the tail end of the leeward surface. This study can provide some theoretical references for mitigating the "blackout" phenomenon of re-entry vehicles.

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Section: Introductionmentioning

confidence: 99%

Terahertz wave propagation characteristics in SMM-based three-dimensional plasma fluid

Zhang,

Wang,

et al. 2024

Phys. Scr.

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“…Also, the propagation of terahertz waves in nonuniform plasma slab under "electromagnetic window" is extensively studied by Li & Zhang. [26] Another scheme of terahertz emission is governed by the nonlinear mixing of laser pulses which requires the energy momentum balance to achieve resonance for maximum transfer of energy from lasers to terahertz radiation using a nonlinear medium called as "plasma". In order to establish resonant transfer of energy for maximized terahertz field excitation, the density rippled plasma is being employed so that a tunable phase matching condition may be achieved.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear mixing-based terahertz emission in inclined rippled density plasmas

2023

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We propose to investigate the THz field generation using nonlinear mixing mechanism of laser beat wave with inclined rippled density plasmas. Two laser pulses with frequencies (ω 1, ω 2) and wave vectors (κ 1,κ 2) co-propagate and resultant laser beat wave forms at beat frequency (ω 1-ω 2). Laser beat wave imparts a nonlinear force on the ambient electrons and pushes them outward with nonlinear velocity v NL . Coupling of induced density perturbation and nonlinear velocityv NL generates nonlinear currents at laser beat frequency that further generates electromagnetic field E (ω 1-ω 2) in terahertz (THz) range. In present scheme, density ripples are introduced at an angle with respect to laser propagation and flat Gaussian index (f) is introduced in laser field profile that transform curved top of Gaussian field envelope into flat top field envelope. The combined effect of flat laser pulses with inclined density ripples in plasmas shows 10 fold enhancement in THz field amplitude when flat-Gaussian index (f) varies from 1 to 4. Also, THz field intensifies when density ripples inclination increases upto a certain angle and then decreases.

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“…Air ionization and heat shield ablation create a plasma sheath around a hypersonic reentry vehicle [1][2][3]. This leads to distortion and interruption of the communication signal, which is the 'blackout' problem [4][5][6]. In the 1960s, the RAM program was launched in the United States, and the project provided many important data for the study of the 'blackout', on which many current projects are based in depth [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Analysis of electromagnetic waves reflected by re-entry plasma sheath based on CSO-FDTD

Zhang,

Li,

Han

2023

Phys. Scr.

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A transmission model of terahertz waves in the plasma sheath is established based on a cascaded finite time domain difference method and analyzed the transmission characteristics of electromagnetic waves under the action of an external magnetic field and collision frequency. The flow field around the hypersonic aircraft is simulated and the characteristics of the flow field as the altitude changes of the aircraft are analyzed based on the flow field distribution of RAM-C (Rapid Attenuation Measurement) vehicle. The results show the transmission characteristics of terahertz waves in plasma that will be affected by flight height, plasma parameters, external magnetic field and collision frequency. In addition, under the action of an external magnetic field and the different collision frequency, the transmission characteristics of the left-handed terahertz wave will be improved. The application of the magnetic field will introduce an absorption peak in the right-handed terahertz wave, and it will move to the high frequency direction with the increase of the magnetic induction intensity.

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Propagation of terahertz waves in nonuniform plasma slab under “electromagnetic window”

Cited by 5 publications

References 31 publications

Terahertz wave propagation characteristics in SMM-based three-dimensional plasma fluid

Terahertz wave propagation characteristics in SMM-based three-dimensional plasma fluid

Nonlinear mixing-based terahertz emission in inclined rippled density plasmas

Analysis of electromagnetic waves reflected by re-entry plasma sheath based on CSO-FDTD

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