【摘要】 时域有限差分法(FDTD)可准确的模拟电磁波经任意介质的衍射与散射.本文依据时域有限差分法并引入Lorentz色散模型理论推导了适用于实际金属的时域有限差分法的迭代公式,利用积分的Maxwell方程组对实际金属边界上的电磁场进行了平均处理,保证了金属缝边界电磁场的连续性,纳米金属缝透射光强分布的数值计算结果验证了边界处理的正确性.更多还原

【Abstract】 The scattering and diffraction of electromagnetic wave through any medium can be accurately simulated by FDTD method.Based on FDTD method and the model of Lorentz dispersion,we educe the formula of electromagnetic wave which is suitable for the metal.And then,we take average process with the electromagnetic wave on the boundary by using integral Maxwell equations,which can satisfy the continuity of the electromagnetic wave on the boundary.The simulated results including the tangential components and the transmitted light intensity distribution of metallic nano-slit verify the rationality of the boundary process.更多还原