Tunable Negative Refractive Index In A Metamaterial Composed Of Magnetized Plasma And Ferromagnetic Grains

Electromagnetic waves (EMWs) propagating in magnetized plasma with ferromag-rnnetic grains (MPFG) in a direction perpendicular to the applied constant magneticrn eld are investigated theoretically and numerically. The MPFG system consists ofrnconventional magnetized electron-ion plasma and ferromagnetic grains that are em-rnbedded uniformly in the plasma. The magnetized plasma forms the electric subsys-rntem while the ferrite grains forms the magnetic subsystem. Being an anisotropicrnmedium, the permittivity, , and permeability, , of the MPFG are second-rankrntensors. For certain frequency domain, in the vicinity of the electron cyclotron fre-rnquency, both and can be simultaneously negative and the corresponding refractivernindex n = rnprn becomes negative, i.e., the MPFG system behaves as left-handedrnmedium (LHM). Moreover, by tuning the material parameters of the electric andrnmagnetic subsystems, the di erent regions, namely, the left-handed medium, right-rnhanded medium, and nontransparent frequency domains can be varied. The analysisrnand results obtained show that the MPFG medium possesses `tunable' negative in-rndex of refraction near the electron cyclotron frequency enabling it to be a left-handedrnmetmaterial. With the current technological advance in the eld of plasma system,rnthe MPFG medium may be fabricated in a laboratory, and hence makes the mediumrna potential candidate for practical applications that employs LHM

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