Browsing by Subject "Cloaking"
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Item Open Access Multifrequency invisibility and masking of cylindrical dielectric objects using double-positive and double-negative metamaterials(Institute of Physics Publishing Ltd., 2009) Serebryannikov, A. E.; Özbay, EkmelWe demonstrate that a circular dielectric cylinder can be nearly invisible at multiple frequencies when being coated with a ring shell, which is made of an isotropic material simultaneously showing large positive or large negative values of permittivity and permeability. The suggested cloaking mechanism is based on the use of radial resonances, which are similar to those in conventional Fabry-Perot resonators. It can be used for cylindrical objects for a wide range of variation of the diameter-to-wavelength ratio, which includes the values corresponding to subwavelength to resonant-sized objects. The presence of frequency dispersion of the shell material positively affects the possibility of multifrequency operation.Item Open Access Non-ideal multifrequency cloaking using strongly dispersive materials(Elsevier, 2010) Serebryannikov, A. E.; Özbay, EkmelNon-ideal multifrequency cloaking of dielectric cylinders is expected to be realizable by using single-layer coating shells, which are made of isotropic homogeneous dispersive materials. In the present paper, scattering on the coated cylinders is studied for the Drude-Lorentz materials with frequency dependent permittivity and permeability. The exploited physical mechanism is based on the Fabry-Perot-type radial resonances arising in the coating shells. The obtained simulation results confirm the possibility of a strong reduction of the total scattering cross section at several frequencies simultaneously. Resonance frequencies can be estimated by using simple algebraic equations. The suggested mechanism can be used for TE and TM polarizations within a wide range of the variation of the diameter-to-wavelength ratio.