Abstract
采用平面波展开法分别模拟了空气背景下由介质圆柱和方柱构造的二维Archimedes（4，8^2）复式晶格光子晶体的能带结构，讨论了介质柱形状、折射率、填充比和旋转对称性等因素对完全光子禁带的影响．研究发现，当折射率在2．60到5．40之间时，介质圆柱和方柱构造的二维Archimedes（4，8^2）复式晶格光子晶体都出现了完全光子禁带．随着折射率的增大，最大完全禁带宽度并非随之增大而是存在峰值，介质圆柱型晶格在折射率为2．80时出现峰值；介质方柱型晶格在折射率为2．80和4．40两处出现峰值，且旋转介质方柱能够明显增大禁带宽度，同时存在最佳旋转角度．分析结果表明，在最大完全禁带处，折射率、填充比以及旋转角度等因素的变化对禁带特性的影响很小．
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