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不同背景介质下金属Cu光子晶体带隙

Keywords: 金属型光子晶体,带隙,表面泄漏,全反射,第三带隙

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Abstract:

提出了一种利用全反射抑制二维光子晶体表面电磁波泄漏的方法,并计算了不同背景介质下的二维金属Cu光子晶体的带隙结构,得到了带隙结构与填充率间的关系曲线。计算方法采用时域有限差分,金属型光子晶体由Cu柱构成。分别计算了以空气为背景介质和以PMMA为背景介质的正方晶格金属型光子晶体的带隙结构。研究结果表明:以PMMA为背景介质的正方晶格金属型光子晶体与以空气为背景介质相比,第一带隙更窄,第二带隙中心频率更低,且在填充率大于0.70时将会出现第三带隙。这对进一步扩展这种光子晶体的应用具有良好的参考意义。

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