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基于时域有限差分(FDTD)法,从麦克斯韦方程组出发,结合周期边界条件将完全匹配层SAC-PML吸收边界条件应用到所建立的光栅数值模型中。对光栅结构和光滑表面结构的光谱特性进行了数值计算,得到了TM波入射时结构的吸收率,讨论了金属光栅耦合的表面等离子极化(SPPs)和空腔谐振模(Microcavity Mode)现象。结果表明由于表面等离子效应和空腔谐振现象的存在,与光滑表面相比光栅表面的吸收率得到了显著的增强。
Based on the finite difference time domain (FDTD) method, from the Maxwell’s equations, the perfectly matched layer SAC-PML absorption boundary conditions are applied to the established numerical model of grating based on the periodic boundary conditions. The spectral characteristics of the grating structure and the smooth surface structure were numerically calculated. The absorption rate of the TM wave was obtained when the TM wave was incident. The phenomena of the surface plasmon polarization (SPPs) and the cavity mode (Cavity Mode) of the grating coupling were discussed. The results show that due to the surface plasmon resonance and cavity resonance phenomena, the surface of the grating compared with the smooth surface of the absorption rate has been significantly enhanced.