Effective plasma frequency in tunable THz reflectors based on graphene and phosphorene

2021 ◽  
Vol 129 (21) ◽  
pp. 213103
Author(s):  
L. A. Tepanecatl Fuentes ◽  
I. Fuentecilla-Carcamo ◽  
J. M. Gutierrez-Villarreal ◽  
Jorge A. Gaspar-Armenta ◽  
M. A. Palomino-Ovando ◽  
...  
Keyword(s):  
Plasma Frequency ◽  
Effective Plasma Frequency

Effective plasma frequency in one-dimensional metallic-dielectric photonic crystals

2005 ◽  
Vol 86 (9) ◽  
pp. 091112 ◽  
Author(s):  
Xiaochuang Xu ◽  
Yonggang Xi ◽  
Dezhuan Han ◽  
Xiaohan Liu ◽  
Jian Zi ◽  
...  
Keyword(s):  
Photonic Crystals ◽  
Plasma Frequency ◽  
One Dimensional ◽  
Effective Plasma Frequency

scholarly journals Large-amplitude electromagnetic waves in magnetized relativistic plasmas with temperature

2014 ◽  
Vol 21 (1) ◽  
pp. 217-236 ◽  
Author(s):  
V. Muñoz ◽  
F. A. Asenjo ◽  
M. Domínguez ◽  
R. A. López ◽  
J. A. Valdivia ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Thermal Effects ◽  
Large Amplitude ◽  
Plasma Frequency ◽  
Plasma Temperature ◽  
Alfven Waves ◽  
Alfvén Waves ◽  
Background Magnetic Field ◽  
Cold Case ◽  
Effective Plasma Frequency

Abstract. Propagation of large-amplitude waves in plasmas is subject to several sources of nonlinearity due to relativistic effects, either when particle quiver velocities in the wave field are large, or when thermal velocities are large due to relativistic temperatures. Wave propagation in these conditions has been studied for decades, due to its interest in several contexts such as pulsar emission models, laser-plasma interaction, and extragalactic jets. For large-amplitude circularly polarized waves propagating along a constant magnetic field, an exact solution of the fluid equations can be found for relativistic temperatures. Relativistic thermal effects produce: (a) a decrease in the effective plasma frequency (thus, waves in the electromagnetic branch can propagate for lower frequencies than in the cold case); and (b) a decrease in the upper frequency cutoff for the Alfvén branch (thus, Alfvén waves are confined to a frequency range that is narrower than in the cold case). It is also found that the Alfvén speed decreases with temperature, being zero for infinite temperature. We have also studied the same system, but based on the relativistic Vlasov equation, to include thermal effects along the direction of propagation. It turns out that kinetic and fluid results are qualitatively consistent, with several quantitative differences. Regarding the electromagnetic branch, the effective plasma frequency is always larger in the kinetic model. Thus, kinetic effects reduce the transparency of the plasma. As to the Alfvén branch, there is a critical, nonzero value of the temperature at which the Alfvén speed is zero. For temperatures above this critical value, the Alfvén branch is suppressed; however, if the background magnetic field increases, then Alfvén waves can propagate for larger temperatures. There are at least two ways in which the above results can be improved. First, nonlinear decays of the electromagnetic wave have been neglected; second, the kinetic treatment considers thermal effects only along the direction of propagation. We have approached the first subject by studying the parametric decays of the exact wave solution found in the context of fluid theory. The dispersion relation of the decays has been solved, showing several resonant and nonresonant instabilities whose dependence on the wave amplitude and plasma temperature has been studied systematically. Regarding the second subject, we are currently performing numerical 1-D particle in cell simulations, a work that is still in progress, although preliminary results are consistent with the analytical ones.

Tuning the effective plasma frequency of nanorod metamaterials from visible to telecom wavelengths

2015 ◽  
Vol 107 (12) ◽  
pp. 121110 ◽  
Author(s):  
M. E. Nasir ◽  
S. Peruch ◽  
N. Vasilantonakis ◽  
W. P. Wardley ◽  
W. Dickson ◽  
...  
Keyword(s):  
Plasma Frequency ◽  
Effective Plasma Frequency

ON THE COULOMB INTERACTION IN CARBON ONIONS AND THEIR ABSORPTION SPECTRA

1996 ◽  
Vol 03 (01) ◽  
pp. 843-847
Author(s):  
D. ÖSTLING ◽  
A. ROSÉN ◽  
S.P. APELL ◽  
G. MUKHOPADHYAY
Keyword(s):  
Coulomb Interaction ◽  
Cross Section ◽  
Absorption Cross Section ◽  
Plasma Frequency ◽  
Uv Spectra ◽  
Absorption Cross ◽  
Low Frequencies ◽  
Carbon Onions ◽  
Rich Spectrum ◽  
Effective Plasma Frequency

We have previously demonstrated the existence of a rich spectrum of collective resonances for both carbon tubes and carbon onions using a classical electrodynamic model. Collective resonances in these systems are predicted to dominate their respective UV spectra. In this study we present results which demonstrate how the coupling between the shells via the Coulomb interaction completely determines the absorption cross section. The outermost shells are strongly screened for low frequencies and frequencies close to the effective plasma frequency of the shells.

scholarly journals Artificial metal with effective plasma frequency in near-infrared region

2010 ◽  
Vol 18 (4) ◽  
pp. 3370 ◽  
Author(s):  
Xingzhan Wei ◽  
Haofei Shi ◽  
Qiling Deng ◽  
Xiaochun Dong ◽  
Chunheng Liu ◽  
...  
Keyword(s):  
Near Infrared ◽  
Plasma Frequency ◽  
Infrared Region ◽  
Near Infrared Region ◽  
Effective Plasma Frequency
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