The Experimental Study Of Transformation Optic Devices

Metamaterials are experiencing a prosperous development in recent years. Its novel electromagnetic properties help explore new things and develop practical devices. Transformation optics is a rigorous mathematical theory, by which coordinate transformation can be achieved through designing the electromagnetic parameters of transformation devices. Transformation optics theory has developed into a basic theory of designing various devices such as ground-plane cloaks, invisibility carpets. In this dissertation, we designed several new devices based on the transformation optics. The main contents and contributions of this paper are listed as follows,a) The concept of the local optical illusion device is proposed. Local optical illusion devices transform or hide a part of the target while keep the rest part unchanged. In experiments, we designed the devices and resistive network is adopted to simulate conductive materials. The distributions of potentials can be tailored at will by designing the resistance of the resistive network. Experimental results of the local optical illusion device show good agreements with the simulation one.b) A super resolution imaging system is designed and fabricated based on the transformation optics theory. It consists of two lens, one half spherical magnifying lens and one planar focusing lens, both of which are fabricated by drilling inhomogeneous air holes in multilayered dielectric plates. The final far-field magnified imaging function is realized by first magnifying the objects with the half spherical magnifying lens and then converging the magnified information with the planar focusing lens. Experimental results show that the proposed system is able to realize perfect magnified imaging with low loss in whole X band.c) An omni-directional absorber is theoretically presented and experimentally measured. The electromagnetic waves can be spirally trapped into the half spherical magnifying lens. It is composed of a planar metamaterial absorb and the half spherical magnifying lens. Experiments results demonstrate that the proposed absorber is able to absorb most of the incident waves.