General design of 3D piecewise homogeneous illusion devices with arbitrary shapes

Abstract

In this work, a general method is presented for the design of arbitrarily shaped 3D illusion devices with piecewise homogeneous parameters based on geometric divisions and linear coordinate transformations. Three illusion devices that can reshape the sizes or positions of the wrapped objects are demonstrated, namely, shrinking, amplifying, and shifting devices. The shrinking device can shrink a larger object into a smaller one with different material parameters, whereas the amplifying device can enlarge a smaller object into a larger one, and a shifting device can generate a new image with an identical size but located at a different position. In addition, based on the presented shrinking device, a perfect 3D invisibility cloak is achieved by shrinking the wrapped object to sufficiently small dimensions as compared to the operating frequency. An electromagnetic concentrator is also obtained by replacing the coated object of the amplifying device with a compression medium. The presented design approach can be easily extended to the design of other electromagnetic devices and even to other physical fields. It is believed that the presented piecewise homogeneous devices are more practicable in reality and can accelerate the potential applications of illusion devices in both military and commercial fields.

Research on Demand Design Method of Cross Polarization Converter Metasurface Based on Depth Generation Model

“…These special properties of metamaterials have been widely used in the fields of super resolution imaging [1], optics [2][3], nonlinear optics [4], filters [5] and so on. Some important electromagnetic devices such as electromagnetic invisibility cloaks [6][7][8], illusionary devices [9][10][11], electromagnetic concentrators [12] and so on have been developed. As a two-dimensional electromagnetic metamaterial, the cross-polarization conversion (CPC) metasurface [13] plays an important role in the polarization regulation of electromagnetic waves for its features such as lightweight, easy to develop, and strong commonality.…”