Designing Optimization Algorithm Of Disordered All-dielectric Magnetic Resonator Based On Simulated Annealing Algorithm And The Corresponding Experimental Verification

The mechanism of using magnetic resonance to enhance magnetic field intensity can not only be applied to the study of magnetic dipole transition in optical band,but also can be used to improve the performance of wireless charging system,etc.Also it has a good application in the whole electromagnetic spectrum.Compared with the giant loss and the high cost of the metal materials,the magnetic resonator based on all-dielectric materials are more and more attractive in the study of magnetic resonance.Regardless of the metal structure or the dielectric structure,considering that the actual sample will be limited by the size and the disorder parasitism during the preparation processing,the realization of magnetic resonance with ideal period structure will be correspondingly limited.At the same time,although the disordered effect has been proven to be used to control electromagnetic resonance,it is generally considered as a kind of a negative effect.What's more,for the complexity of the disorder effects,how to make use of these random perturbation characteristic to regulate electromagnetic resonance reasonably and effectively is of great significance.Therefore,this thesis proposes an optimal design scheme for disordered structures based on the combination of Simulated Annealing algorithm and the numerical solution of Maxwell equations.By using the optimization algorithm to perturb the finite ordered structure,the optimized disordered all-dielectric magnetic resonator is finally obtained.In this thesis,we will focus on the optimization design of the disordered all-dielectric magnetic resonator to carry out the following work:1.This thesis establishes the disordered structure that adapted to the actual preparation technology.Two disordered structure models are designed,one is based on the random distribution function and the other is based on the random coordinate shift.And through numerical simulation,it is proved that these two disordered models can be used to realize magnetic resonator,both of which can increase the intensity of the near-field magnetic field.This work can provide a reference for modeling disordered structures.2.A device optimization scheme is proposed which aims at multiple optimization variables and makes the tradeoff between the calculation time and the global optimal solution.Because of the limited computing resources in practical research,a scheme of Simulated Annealing algorithm with constant temperature is adopted.This solution can more easily obtain accurate solutions within limited calculation times,and it can be effectively applied to the optimization design of disordered structures with multi-dimensional parameter variables.3.Numerical simulation and microwave experimental verification are carried out for the disordered magnetic resonator designed by the optimization algorithm.In this work,on the basis of the ordered structure,we use the Simulated Annealing algorithm to optimize the disordered resonator which increases the magnetic field amplitude in the polarization direction and the transmission direction,respectively.At the same time,the magnetic field distribution of the disordered structure is more concentrated.We further verify the numerical results through the microwave experiment.In addition,we also extend this design idea to optical frequency band.Finally,we analyze the robustness of the optimized disordered magnetic resonator.In this thesis,by introducing the disordered effect into the ordered array and combining with the auxiliary design of optimization algorithm,we verify the feasibility of using the optimization algorithm to design the disordered magnetic resonator,which is expected to provide a new prospective for the regulation of electromagnetic resonance by using the disordered effect.