基于非分裂FDTD的左手介质电磁特性的研究

The research of left-handed material using unsplit FDTD method

为验证左手介质的电磁特性,采用非分裂时域有限差分方法对左手介质的Drude模型进行建模.这种方法不需要对电场和磁场进行分裂,也不需要对PML空间进行特殊处理,吸收边界PML和工作空间可以通过参数转换来完成,并且构造的PML层为有耗介质,进入PML层的透射波将迅速衰减.它是一种准确而有效的分析色散和各向异性介质的方法,通过此方法有效地验证了左手介质的负折射效应、汇聚效应、相位补偿效应,充分验证了左手介质及其反常特性的存在性和此方法分析左手介质的有效性.

In order to certificate the electromagnetic characteristic of left-handed materias （LHM）, we adopt unsplit finite-difference time domain method （FDTD） to the ideal Drude model of LHM. This method does not need to split the electric and magnetic fields and does not need the use of special treatment of PML. PML and working space can be converted with the parameters. The penetrating wave will be attenuated in the PML which is set up by lossy dielectric. So it is an effective method to analyze dispersion and anisotropic material. Thus we can confirm the LHM and its unique characteristics such as negative refraction, convergent and phase compensation and verify the effectiveness of analyzing LHM using unsplit FDTD.