Browsing by Author "Abdella, Abdulhayi"

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    Media with Negative Refractive index and their Electromagnetic Properties
    (Addis Ababa University, 2010-06) Abdella, Abdulhayi; MAL’NEV, V.N. (Professor)
    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