Inverse design-based metamaterial transparent device and its multilayer realization

Abstract

We propose an inverse method to determine the material parameters of a transparent device without any knowledge of the corresponding transformation function. The required parameters are independently obtained and expressed as functions of the introduced generator. Moreover, to remove the inhomogeneity and anisotropy of material parameters, a layered transparent device composed of only homogeneous and isotropic materials is presented based on the effective medium theory. The feasibility of using the layered device in antenna protection is also investigated. Full-wave simulation is carried out for verification. This work paves a new way toward designing metamaterial devices without specifying the underlying coordinate transformation, and has great guiding significance for the practical fabrication of transparent devices.

Homogeneous Multifunction Devices Designing and Layered Implementing Based on Rotary Medium

“…Besides invisible cloak, concentrator 13 – 18 , transparent device 19 – 22 , amplifying device 23 , shrinking device 24 – 26 and EM field rotator 27 – 29 have also attracted widespread attention for their special functions and properties. For example, concentrator endows the capability to enhance the EM field distribution in the core region and has potential application in the harnessing of light in solar cells or similar devices 14 , 15 , while transparent device has the capability to protect an antenna or other object inside the device without affecting their performance 20 , 22 . Amplifying device or shrinking device can make an arbitrary shaped object virtually acts as another one with different material parameters and geometrical size, and have potential applications in military camouflage and other communication engineering fields 23 , 24 .…”

Homogeneous transparent device and its layered realization

“…In Ref. [36], an inverse design method was used to realize 2D circular transparent devices, which enables us to obtain the material parameters of transparent devices without knowing the specific transformation function. However, it is worth mentioning that all the reported proposals are specifically for the particular symmetric geometries, which restricts their potential applications where an arbitrarily shaped geometry is required.…”