scholarly journals Enhancement of the surface emission at the fundamental frequency and the transmitted high-order harmonics by pre-structured targets

2019 ◽  
Vol 7 ◽  
Author(s):  
K. Q. Pan ◽  
D. Yang ◽  
L. Guo ◽  
Z. C. Li ◽  
S. W. Li ◽  
...  
Keyword(s):  
Fundamental Frequency ◽  
Laser Energy ◽  
Rear Surface ◽  
Critical Density ◽  
Plasma Waves ◽  
High Order ◽  
Surface Plasma ◽  
Particle In Cell ◽  
Surface Emission ◽  
Surface Plasma Waves

Laser interaction with an ultra-thin pre-structured target is investigated with the help of both two-dimensional and three-dimensional particle-in-cell simulations. With the existence of a periodic structure on the target surface, the laser seems to penetrate through the target at its fundamental frequency even if the plasma density of the target is much higher than the laser’s relativistically critical density. The particle-in-cell simulations show that the transmitted laser energy behind the pre-structured target is increased by about two orders of magnitude compared to that behind the flat target. Theoretical analyses show that the transmitted energy behind the pre-structured target is actually re-emitted by electron ‘islands’ formed by the surface plasma waves on the target surfaces. In other words, the radiation with the fundamental frequency is actually ‘surface emission’ on the target rear surface. Besides the intensity of the component with the fundamental frequency, the intensity of the high-order harmonics behind the pre-structured target is also much enhanced compared to that behind the flat target. The enhancement of the high-order harmonics is also related to the surface plasma waves generated on the target surfaces.

scholarly journals Parametric excitation of surface plasma waves over a metallic surface by laser in an external magnetic field

2018 ◽  
Vol 36 (1) ◽  
pp. 92-97
Author(s):  
Prashant Chauhan ◽  
Deepika Goel ◽  
Anshu Varshney ◽  
D. B. Singh ◽  
Vivek Sajal
Keyword(s):  
Magnetic Field ◽  
Growth Rate ◽  
Space Charge ◽  
Ponderomotive Force ◽  
Laser Energy ◽  
Incidence Angle ◽  
Plasma Waves ◽  
Metallic Surface ◽  
Surface Plasma ◽  
Surface Plasma Waves

AbstractEffects of external static magnetic field (applied in$\hat y$-direction) on resonant excitation of surface plasma waves (SPW) have been investigated over the metal free space interface. The high power laser$({\rm \omega} _0,\;\vec k_{0z})$is incident over the metal surface and exerts a ponderomotive force on the metal electrons in the skin layer. The ponderomotive force disturbs the quasi-neutrality of plasma which results into the excitation of space charge field at the frequency 2ω0. The electron density perturbation at frequency 2ω0driven by self-consistent space charge potential couples with the oscillatory velocity due to the seed SPW$({\rm \omega}, \;\vec k_z)$and produces nonlinear current to drive another counter propagating SPW$({\rm \omega} _1,\;\vec k_{1z})$at the phase matching conditions of frequency ω = ω1− 2ω0and wavenumber$\vec k_z = \vec k_{1z} - 2\vec k{}_{0z}$(by feedback mechanism). The parametric process becomes resonant at 2ω0≈ ωpand the maximum growth rate is achieved for an incidence angle of laser θ = 40°. The growth rate of the process reduces to half on increasing the magnetic field from 0.49 to 2.45 MG. The present study may be significant to the laser absorption experiments where surface rippling can strongly affect the laser energy absorption.

Study of strong enhancement of synchrotron radiation via surface plasma waves excitation by particle-in-cell simulations

2015 ◽  
Vol 107 (18) ◽  
pp. 183902 ◽  
Author(s):  
K. Q. Pan ◽  
C. Y. Zheng ◽  
Dong Wu ◽  
L. H. Cao ◽  
Z. J. Liu ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Plasma Waves ◽  
Surface Plasma ◽  
Particle In Cell ◽  
Strong Enhancement ◽  
Surface Plasma Waves

Detection of swine-origin influenza A (H1N1) viruses using a paired surface plasma waves biosensor

2010 ◽  
Author(s):  
Li-Chen Su ◽  
Ying-Feng Chang ◽  
Ying-Chang Li ◽  
Jo-Ping Hsieh ◽  
Cheng-Chung Lee ◽  
...  
Keyword(s):  
Influenza A ◽  
Plasma Waves ◽  
Surface Plasma ◽  
Surface Plasma Waves ◽  
Influenza A H1n1

Scattering of an unmagnetized sheet electron beam by surface plasma waves

1992 ◽  
Vol 35 (1) ◽  
pp. 58-65
Author(s):  
S. S. Moiseev ◽  
O. Yu. Naguchev ◽  
V. I. Tkachenko ◽  
V. N. Dubovik
Keyword(s):  
Electron Beam ◽  
Plasma Waves ◽  
Surface Plasma ◽  
Surface Plasma Waves ◽  
Sheet Electron Beam

scholarly journals Collective absorption of laser radiation in plasma at sub-relativistic intensities

2019 ◽  
Vol 7 ◽  
Author(s):  
Y. J. Gu ◽  
O. Klimo ◽  
Ph. Nicolaï ◽  
S. Shekhanov ◽  
S. Weber ◽  
...  
Keyword(s):  
Inertial Confinement Fusion ◽  
Stimulated Raman Scattering ◽  
Laser Energy ◽  
Brillouin Scattering ◽  
Critical Density ◽  
Plasma Waves ◽  
High Amplitude ◽  
Inertial Confinement ◽  
Hot Electron ◽  
Plasma Parameters

Processes of laser energy absorption and electron heating in an expanding plasma in the range of irradiances $I\unicode[STIX]{x1D706}^{2}=10^{15}{-}10^{16}~\text{W}\,\cdot \,\unicode[STIX]{x03BC}\text{m}^{2}/\text{cm}^{2}$ are studied with the aid of kinetic simulations. The results show a strong reflection due to stimulated Brillouin scattering and a significant collisionless absorption related to stimulated Raman scattering near and below the quarter critical density. Also presented are parametric decay instability and resonant excitation of plasma waves near the critical density. All these processes result in the excitation of high-amplitude electron plasma waves and electron acceleration. The spectrum of scattered radiation is significantly modified by secondary parametric processes, which provide information on the spatial localization of nonlinear absorption and hot electron characteristics. The considered domain of laser and plasma parameters is relevant for the shock ignition scheme of inertial confinement fusion.

scholarly journals Universal self-amplification channel for surface plasma waves

2017 ◽  
Vol 95 (4) ◽  
Author(s):  
Hai-Yao Deng ◽  
Katsunori Wakabayashi ◽  
Chi-Hang Lam
Keyword(s):  
Plasma Waves ◽  
Surface Plasma ◽  
Surface Plasma Waves
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