Waves and Negative Refraction in Magnetized Plasma with Ferrite Grains
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Date
2012-06
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Addis Ababa University
Abstract
This thesis describes that some electrodynamical properties of left-handed media and
experiments realize to allow these metamaterials. The dispersion properties of a material
is controlled by both dilectric permittivity and magnetic permeability tensors. The
dispersion of the permittivity is caused by electron-ion plasma and the dispersion of permeability
is caused by the high frequency magnetization of the ferromagnetic grains. The
propagation of high frequency EMWs in the low temperature magnetized plasma with ferromagnetic
grains (MPFG) is analyzed. Our MPFG system becomes transparent for the
waves that cannot propagate in conventional magnetized plasma, which is the dispersion
of permeability is zero. It is shown that the refractive index of the extraordinary wave
propagating along the external magnetic eld through MPFG can be negative and the
phase velocity also negative in the vicinity of !c. The strong dispersion of the refractive
index and the group velocity results in the spreading of the wave packets, which propagate
with velocity much smaller than the speed of light
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Keywords
Waves and Negative Refraction