Some simplified routes to illusion devices

Abstract

Electromagnetic illusion device has attracted much attention in recent years because it could make an arbitrary object appear as a pre-designed one, and thus has many potential applications in camouflage, optical and/or microwave detection. However, TO based illusion device requires lossless double-negative materials. It is difficult to put the equipment into practice for the tough work to achieve the needed parameters in electromagnetic and optical spectra. Some easier ways to realize the improved illusion devices are proposed, in which only anisotropic and inhomogeneous media with positive components are required, but the experimental performance usually needs thousands of varying unit cells. Here we show that some illusion devices can actually be realized with simplified routes, and they are easier to implement with simpler parameters than previous ones. Numerical simulation and experimental results are presented to verify the good performance of the simplified illusion devices. Our design may give rise to new inspirations for the strategy to make the novel TO based device close to reality.