Band-gap engineering in two-dimensional periodic photonic crystals
Band-gap engineering in two-dimensional periodic photonic crystals
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DOI：
10.1063/1.1288229
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发表时间：
1999-10
影响因子：
3.2
通讯作者：
M. Kushwaha
中科院分区：
文献类型：
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作者：
M. Kushwaha
本文从理论上研究了嵌入在介质（半导体）背景中的半导体（介电）圆柱体二维周期系统中等离子体的色散特性。我们考虑了正方形和六边形排列，并在局部理论的框架内使用平面波方法计算了等离子体的宽带结构。发现这样的半导体-介电复合体系会产生巨大的全带隙（隙中比≈2），在此带隙内等离子体传播被禁止。这项调查最有趣的方面是出现在阈值频率以下的巨大的最低差距，并一直延伸到零。该间隙的最大幅度由内含物的等离子体频率或背景（视情况而定）确定。一般来说，我们发现电介质（和等离子体频率）的不匹配越大，这个最低带隙就越大。无论是否出现更高的能隙，最低的能隙总是…
A theoretical investigation is made of the dispersion characteristics of plasmons in a two-dimensional periodic system of semiconductor (dielectric) cylinders embedded in a dielectric (semiconductor) background. We consider both square and hexagonal arrangements and calculate extensive band structures for plasmons using a plane-wave method within the framework of a local theory. It is found that such a system of semiconductor-dielectric composite can give rise to huge full band gaps (with a gap to midgap ratio ≈2) within which plasmon propagation is forbidden. The most interesting aspect of this investigation is the huge lowest gap occurring below a threshold frequency and extending up to zero. The maximum magnitude of this gap is defined by the plasmon frequency of the inclusions or the background as the case may be. In general we find that the greater the dielectric (and plasmon frequency) mismatch, the larger this lowest band gap. Whether or not some higher energy gaps appear, the lowest gap is always ...