Study On Sensor And Invisibility Cloak Based On Metamaterials

Metamaterials with the extraordinary physical properties which nature materials do not have are made up of the artificial composite structures or composite materials. As one of the hot fields of the current domestic and international research, metamaterial has received more and more attention in many fields such as materials science, optics, applied electromagnetics. Based on the theory of metamaterials, this article does some meaningful exploration in the application of sensor and invisible cloak. The main research works are as follows:First, we propose a asymmetric split ring resonator sensors working in C-band. By changing the position of the opening in the split ring resonator, the electromagnetic field in a specific region is enhanced. So the sensor has a high Q value and a high sensitivity. Then we simulate the sensor for sensing the changes in the dielectric properties of the material. The sensor can be excited easily and has a simple structure. Thus, it is easy to be processed.Secondly, we combine a kind of groove fold structure made of thin copper with WGM to design a spoof surface WGM sensor. Since the spoof SPP propagating in the groove fold structure is very sensitive to the changes in the dielectric environment, the sensor has a very high sensitivity. The sensor has potential applications in the detection of trace amounts of the medium samples in both biological and chemical fields. The research provides a feasible way for the design and frication of the new metamaterial sensor.Finally, we expand the traditional electromagnetic stealth technology to thermodynamics. By solving the Laplace equation of the transform space and the original space, the thermal conductivity tensor of the thermal cloak which has a arbitrary shape is obtained. Results of full wave simulation show that the cloak can correctly guide the heat bypass the inner region and its heat flux is zero. It means the cloak has a good thermal protection function. Meanwhile, the heat fluxes return to their original pathways, resulting in a perfect thermal invisible effect. This research has potential applications in thermal sensors, electronic chips and other equipments for thermal protection.