Propagation Characteristics of Terahertz Waves in Inhomogeneous Plasma Sheath

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

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

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	$\begin{array}{l} n_{e} = \{\begin{matrix} n_{0} {\{1 + e x p [- 200 \times (z - d / 4)]\}}^{- 1} & (0 < z \leq d / 2) \\ n_{0} {\{1 + e x p [200 \times (z - 3 d / 4)]\}}^{- 1} & (d / 2 < z \leq d) \end{matrix} \\ v_{e} = \{\begin{matrix} 2 π f_{0} {\{1 + e x p [- 200 \times (z - d / 4)]\}}^{- 1} & (0 < z \leq d / 2) \\ 2 π f_{0} {\{1 + e x p [200 \times (z - 3 d / 4)]\}}^{- 1} & (d / 2 < z \leq d) \end{matrix} \end{array}$

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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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Paper Information

Category: Fourier Optics and Signal Processing

Received: Dec. 1, 2021

Accepted: Jan. 5, 2022

Published Online: Jul. 22, 2022

The Author Email: Jie Zhang (zhangjie@nwnu.edu.cn)

DOI:10.3788/LOP202259.1707002

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology