This work is an extension to the evaluation and analysis of a two-dimensional cylindrical cloak in the Terahertz or visible range\nspectrum using Finite Difference Time-Domain (FDTD) method. It was concluded that it is possible to expand the frequency range\nof a cylindrical cloaking model by careful scaling of the inner and outer radius of the simulation geometry with respect to cell size\nand/or number of time steps in the simulation grid while maintaining appropriate stability conditions. Analysis in this study is\nbased on a change in the radii ratio, that is, outer radius to inner radius, of the cloaking structure for an array of wavelengths in the\nvisible spectrum. Corresponding outputs show inconsistency in the cloaking pattern with respect to frequency. The inconsistency\nis further increased as the radii ratio is decreased.The results also help to establish a linear relationship between the transmission\ncoefficient and the real component of refractive index with respect to different radii ratios which may simplify the selection of the\nmaterial for practical design purposes. Additional performance analysis is carried out such that the dimensions of the cloak are\nheld constant at an average value and the frequency varied to determine how a cloaked object may be perceived by the human eye\nwhich considers different wavelengths to be superimposed on each other simultaneously.
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