Media with Negative Refractive index and their Electromagnetic Properties
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Date
2010-06
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Addis Ababa University
Abstract
In this project it was intended to reveal that the main electrodynamical properties of
media with negative refractive index. The negative sign of the refractive index was firstly
predicted in the theoretical description of the EM properties of materials with simultaneously
negative values of permittivity ε and permeability μ. Medium with negative ε and μ is termed
as left-handed medium (LHM). At the time being, there are known experimental realization of
the systems, which demonstrates the properties of LHM. The properties of LHM are
theoretically described in the plasma with ferromagnetic grains. Reversal of wave propagation
contains important implications for nearly all electromagnetic phenomena. Electromagnetic
properties following a negative refractive index was also explored. It has been also shown that
metamaterials can be constructed for which the index of refraction is negative over a finite
band of frequency.
We show that the refractive index of the extraordinary wave propagating along the
external magnetic field with frequencies close to c
w can be negative as well as positive. For
the typical parameters of Magnetized Plasma with Ferrite Grains, the group velocity of this
wave is much smaller than the speed of light
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Media with Negative Refractive index