采用平面波展开法分析三角格子二维光子晶体中负折射现象出现的频率范围,然后用有限时域差分法模拟光在空气和二维三角格子光子晶体界面的折射行为,得到了负折射出现在群速度为负的频段的结论,并且详细比较了光子晶体中不同频率的负折射行为.
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