Analysis And Research Of Left-hand Material FDTD Algorithm Based On Drude Model

As a new type of electromagnetic material,Left-handed material(LHM)has different electromagnetic properties from conventional materials,making it a popular material,and has broad application prospects in medical imaging and optics.Since Maxwell's equation is often used to solve electromagnetic field related problems,it plays an important role in the study of electromagnetic properties of left-handed materials.The Finite-Difference Time Domain(FDTD)algorithm is widely used in the time domain to directly differentiate the Maxwell equations.It is simple and convenient,and easier to computer program.Based on the basic electromagnetic characteristics of LHM,the Drude model is used as the mathematical model of LHM.Through the improvement of different FDTD algorithms,the improved algorithm is used to simulate,and the correctness of the improved algorithm is verified according to the relevant electromagnetic characteristics of LHM.The application of LHM in medical imaging is also discussed.Firstly,starting from the time domain Maxwell equation,some electromagnetic characteristics of LHM are briefly introduced to realize the initial understanding of LHM.Secondly,through the introduction of the difference format,boundary conditions and stability and convergence of the FDTD algorithm,and the corresponding computer simulation,the comparative analysis of the FDTD algorithm and the CNAD-FDTD algorithm is completed,which is the later LHM electromagnetic characteristics.The method of verification is provided.Thirdly,the LHM of the Drude model is introduced.Through the improvement of the FDTD algorithm and the CNAD-FDFD algorithm,one of the innovations of this paper is to propose the CNAD-FDTD-PML algorithm with the PML truncation boundary of LHM,and complete the relevant simulation calculation.Verify the electromagnetic properties of the LHM negative refraction and the correctness of the associated improved algorithm.Finally,using the improved FDTD algorithm and CNAD-FDTD algorithm,combined with the electromagnetic properties of LHM negative refraction,the second innovation of this paper is to discuss its influence on medical imaging quality from two aspects of LHM location and its thickness.LHM provides a reference for the application of medical imaging.