Tunable Negative Refractive index in a Metamaterial Composed of Magnetized Plasma and Ferromagnetic Grains
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Date
2017-08
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Addis Ababa University
Abstract
Electromagnetic waves (EMWs) propagating in magnetized plasma with ferromag-
netic grains (MPFG) in a direction perpendicular to the applied constant magnetic
eld are investigated theoretically and numerically. The MPFG system consists of
conventional magnetized electron-ion plasma and ferromagnetic grains that are em-
bedded uniformly in the plasma. The magnetized plasma forms the electric subsys-
tem while the ferrite grains forms the magnetic subsystem. Being an anisotropic
medium, the permittivity, , and permeability, , of the MPFG are second-rank
tensors. For certain frequency domain, in the vicinity of the electron cyclotron fre-
quency, both and can be simultaneously negative and the corresponding refractive
index n =
p
becomes negative, i.e., the MPFG system behaves as left-handed
medium (LHM). Moreover, by tuning the material parameters of the electric and
magnetic subsystems, the di erent regions, namely, the left-handed medium, right-
handed medium, and nontransparent frequency domains can be varied. The analysis
and results obtained show that the MPFG medium possesses `tunable' negative in-
dex of refraction near the electron cyclotron frequency enabling it to be a left-handed
metmaterial. With the current technological advance in the eld of plasma system,
the MPFG medium may be fabricated in a laboratory, and hence makes the medium
a potential candidate for practical applications that employs LHM
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Keywords
Plasma and Ferromagnetic Grains