Transformation optics (TO) has recently become a useful methodology in the design of unusual optical devices, such as novel metamaterial lenses and invisibility cloaks. Very recently Danner et al. [1] have suggested theoretical extension of this approach to birefrigent TO devices, which perform useful and different functions for mutually orthogonal polarization states of light. Theoretical designs which operate as invisibility cloak for one polarization while behaving as a Luneburg lens for another orthogonal polarization have been suggested. Here we report the first experimental realization of similar birefrigent TO designs based on lithographically defined metal/dielectric waveguides. Adiabatic variations of the waveguide shape enable control of the effective refractive indices experienced by the TE and TM modes propagating inside the waveguides. We have studied wavelength and polarization dependent performance of the resulting birefrigent TO devices. These novel optical devices considerably extend our ability to control light on submicrometer scales.
Very recently Farhat et al. [1] have suggested that arrays of invisibility cloaks may find important applications in low-interference communication, noninvasive probing, sensing and communication networks, etc. We report on the first experimental realization of such an array of broadband invisibility cloaks, which operates in the visible frequency range. Wavelength and angular dependencies of the cloak array performance have been studied. Ever since the first experimental demonstrations in the microwave [2] and visible [3] ranges, invisibility cloaks paved the way to considerable progress in the fields of metamaterials and transformation optics. Based on the considerable recent progress in the cloaking research, very recently Farhat et al. [1] introduced a new concept of an invisibility cloak array, which may find numerous applications in such fields as lowinterference communication, noninvasive probing, sensing and communication networks, etc. Besides these obvious practical applications, building and studying the arrays of invisibility cloaks offer more refined experimental tools to test cloak
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