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Title: Characterization of spherical metamaterials
Keywords: Metamaterial, Dyadic Green’s Function,Spherical structure
Issue Date: 19-May-2005
Citation: HUANG NINGYUN (2005-05-19). Characterization of spherical metamaterials. ScholarBank@NUS Repository.
Abstract: Materials possessing both negative permittivity and permeability simultaneously, i.e., left-handed materials or metamaterials were firstly introduced in 1968. This special kind of materials demonstrates different characteristics from the conventional materials. In this thesis, the electromagnetic fields produced by a dipole in the presence of metamaterial spheres are analyzed.Firstly, some properties of metamaterial, including negative refractive index and lateral displacement of a Gaussian beam reflected from a grounded metamaterial, are introduced and discussed. Secondly, spherical dyadic Greena??s functions in such a material are analyzed, and the eigenfunction expansion of DGF and the recurrence matrix equations for the coefficients of scattering DGF are emphasized. Thirdly, the scattering of normal material sphere is introduced. Scattering by two separate spheres is analyzed in particular. Finally, the spherical metamaterial objects are analyzed. Three cases are considered respectively: the single sphere, the spherical shell and the multi-layer sphere. Finally, simulation results are given and discussed.
Appears in Collections:Master's Theses (Open)

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