Research On The Magnetic Response Of The Semiconductor-based Metamaterials

Magnetic resonance meta-material is an artificially composite structure or a composite material, which can exhibit electromagnetic characteristics unlike those of any conventional materials. A common ferromagnetic material loses magnetic properties in the mid-infrared, so the realization of artificial magnetic resonance effect is the first problem to be solved to realize the application of devices. Due to the inherent loss of metal materials, the devices capable of generating magnetic effect is difficult to achieve. In order to solve the high losses and difficult integration problems in this paper, we proposed a method using semiconductor(tellurium, germanium, silicon) materials arranged in a periodic structure to realize magnetic resonance in the mid-infrared. The possibility of constructed structure using semiconductor materials in the mid-infrared to achieve magnetic resonance was studied by theoretical analysis and numerical simulation. Meanwhile, the main parameters that affect the performance of the resonator was made a systematic study.Based on Mie scattering theory and the theory of dielectric resonators, the structure of the meta-material we designed is to be calculated by COMSOL and FDTD simulation tools. By analyzing the corresponding transmission spectrum, the electric field distribution data and a magnetic resonance enhancement factor, we verified the semiconductor meta-material we designed can achieve magnetic resonance effect in the mid-infrared.The refractive index of the semiconductor materials and the substrate materials is critical to the design of dielectric meta-material by analyzing the FDTD simulation results. As the refractive index of the semiconductor medium increases, red shift of the resonance wavelength occurs, magnetic resonance of meta-material become more intense. Substrate need to select a low loss transparent material, or it will affect the performance of magnetic resonance. The refractive index of the substrate must be as small as possible compared to the dielectric block, the smaller the refractive index of the substrate, the greater the enhancement of magnetic resonance.Finally, we investigated the influence of the main parameters(dielectric block side length L, the thickness T of the medium and a medium pitch W) which affect the magnetic resonance properties of semiconductor-based meta-material. And we summarized the variation between the magnetic resonance performance and structure parameters. Our research results can provide guidance for future theoretical research and implementation of the mid-infrared magnetic resonance response of the device.