【摘要】 使用OptiFDTD对透射型亚波长二元闪耀光栅的透射场进行了数值模拟;使用FFT方法对电磁场分量进行分析,得到其各个级次的能量分布,进而分析了亚波长结构二元光栅的各个参数对衍射性能的影响。分析结果证实:透射型亚波长二元闪耀光栅可将正入射的TE波闪耀到+1级,且等分数对衍射角影响很小。给定波长,其设计主要由光栅周期、光栅材料折射率和等分数这3个参数决定。更多还原

【Abstract】 OptiFDTD and Fast Fourier Transform method are used to simulate and analyze the diffracted field of transmission sub-wavelength binary gratings(TSBG).And the influence of grating parameters on the diffraction efficiency is numerically analyzed.The analysis result demonstrates that,for TSBG,the normal incident TE mode beam can be diffracted to the +1st order,the interval number has few influence on diffracted angle,the performance of a TSBG is determined by the grating period,material index and interval number for a given wavelength.更多还原