Propagation Characteristics of Terahertz Waves in Inhomogeneous Plasma Sheath

Jie Zhang; Bing Han; Shanchao Zhao; Guodong Zhang

doi:10.3788/LOP202259.1707002

Journals >Laser & Optoelectronics Progress >Volume 59 >Issue 17 >Page 1707002 > Article

Laser & Optoelectronics Progress
Vol. 59, Issue 17, 1707002 (2022)

Propagation Characteristics of Terahertz Waves in Inhomogeneous Plasma Sheath

Jie Zhang^1、2、*, Bing Han^1、2, Shanchao Zhao^1、2, and Guodong Zhang^1、2

Author Affiliations

¹College of Physics and Electronic Engineering, North West Normal University, Lanzhou 730070, Gansu , China

²Intelligent Information Technology and Application Engineering Research Center of Gansu Province, Lanzhou 730070, Gansu , China

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DOI: 10.3788/LOP202259.1707002 Cite this Article Set citation alerts

Jie Zhang, Bing Han, Shanchao Zhao, Guodong Zhang. Propagation Characteristics of Terahertz Waves in Inhomogeneous Plasma Sheath[J]. Laser & Optoelectronics Progress, 2022, 59(17): 1707002 Copy Citation Text

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Fig. 1. Schematic diagram of terahertz wave oblique incidence to inhomogeneous plasma sheath

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Fig. 2. Different profiles of electron densites in plasma sheath

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Fig. 3. Transmittance of terahertz waves incident at different incident angles in plasma sheaths with different profiles. (a) Gaussian profile; (b) parabolic profile; (c) bi-exponential profile

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Fig. 4. Propagation characteristics of terahertz waves in plasma sheaths with different profiles. (a) Transmissivity; (b) amplitude

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Fig. 5. Phase-shift characteristics of terahertz wave in plasma sheath at different incident angles

θ_{(0)}

. (a)

θ_{(0)} = 0 °

; (b)

θ_{(0)} = 45 °

; (c)

θ_{(0)} = 60 °

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Fig. 6. Effects of different external magnetic fields on transmissivity of terahertz waves in inhomogeneous plasma sheath

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Fig. 7. Effects of different electron densities on transmissivity of terahertz waves in inhomogeneous plasma sheath

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Fig. 8. Effects of different electronic collision frequencies on transmissivity of terahertz waves in inhomogeneous plasma sheath

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No.	Profile	Function
Case1	Gaussian	$\begin{array}{l} n_{e} = n_{0} e x p [- 1000 \times {(z - d / 2)}^{2}] \\ v_{e} = 2 π f_{0} e x p [- 1000 \times {(z - d / 2)}^{2}] \end{array}$
Case2	Parabolic	$\begin{array}{l} n_{e} = n_{0} [1 - {(1 - 2 z / d)}^{2}] \\ v_{e} = 2 π f_{0} [1 - {(1 - 2 z / d)}^{2}] \end{array}$
Case3	Bi-exponential	$\begin{array}{l} n_{e} = \{\begin{matrix} n_{0} {\{1 + e x p [- 200 \times (z - d / 4)]\}}^{- 1} & (0 < z \leq d / 2) \\ n_{0} {\{1 + e x p [200 \times (z - 3 d / 4)]\}}^{- 1} & (d / 2 < z \leq d) \end{matrix} \\ v_{e} = \{\begin{matrix} 2 π f_{0} {\{1 + e x p [- 200 \times (z - d / 4)]\}}^{- 1} & (0 < z \leq d / 2) \\ 2 π f_{0} {\{1 + e x p [200 \times (z - 3 d / 4)]\}}^{- 1} & (d / 2 < z \leq d) \end{matrix} \end{array}$

Table 1. Distributions of different electron densites and collision frequences in plasma sheath

Jie Zhang, Bing Han, Shanchao Zhao, Guodong Zhang. Propagation Characteristics of Terahertz Waves in Inhomogeneous Plasma Sheath[J]. Laser & Optoelectronics Progress, 2022, 59(17): 1707002

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