Propagation of electromagnetic waves in left-handed media

Abstract

In this thesis, we discussed briefly about the artificial material properties which exhibited simultaneously negative values of electric permittivity, magnetic permeability and refractive index across a common frequency band. Here, we used methods, like analytical and computational methods to achieve the targeted objectives. The proposed left-handed media are used mainly in optical and electronic devises in better way as compared to that of the conventional media. Left-handed media are applicable in electromagnetic absorbers such as, radar microwave absorbers, electrically small resonators, wave guides that can go beyond the diffraction limit, phase compensators, advancement in focussing devices(example microwave lens), and improved electrically small antennas. In this work, we have calculated about the real and imaginary parts of electric permittivity and magnetic permeability by using Drude model. Currently, left-handed media are being developed to manipulate electromagnetic radiation.First of all, I would like to thanks my Almighty God for his presence in my work. In particular, I would like to express my deepest gratitude to my advisor Dr. Menberu Mengesha for his valuable and constructive suggestions, directive comments, giving and installing different important softwares and computational supports starting from the topic selection up to the completion of of this thesis work. I thank him really a lot for his contractive advice and guidance to the right research direction, enforcing me in order to developing skills on my work, encouraging and giving supportive guidance in developing computer skill (including Latex software, and Matlab). Next, I would like to thank my co-advisor Dr. Nebiyu Gemechu for his insightful comment to the accuracy of this thesis, continuous encouragement during my proposal delivery up to the final of this thesis. My sincere thank also goes to Dr.Solomon Negash for his nice approach, directive comments and giving important softwares. Finally, I would like to thanks my wife Hawa Ali for her love, moral and financial support and all my classmates and friends for their supports and constructive comments for the success of my thesis work!