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首页> 外文期刊>Journal of optics >Enhanced energy confinement induced by metallic coating of central rod in square array photonic crystal of dielectric rods for TM light
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Enhanced energy confinement induced by metallic coating of central rod in square array photonic crystal of dielectric rods for TM light

机译：介电棒方阵光子晶体中中心棒金属涂层对TM光的增强能量约束

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摘要

We study the effects of a defect created by metallic coating of the central rod in a square lattice of dielectric rods for TM polarization lights. A calculation using the Plane Wave Expansion Method (PWE) in the supercell model shows that the photonic band structure and field distribution in the defect area varies with changing metallic layer thickness. The optimal energy localization is explored by varying the thickness of the metal layer. Enhancement of the energy confinement is described by the narrower spatial distribution profile of the energy with thicker metal coating. A more quantitative description, given in terms of confinement quality (CQ) defined by the normalized integrated intensity in the central rod, exhibits monotonous increase of CQ with growing metal layer thickness. The highest CQ value achieved is around 80% for a 3×3 supercell, which is considerably higher than the 44% optimal value achievable in the same dielectric PC structure with a defective central rod. Further calculation using the Extended Plane Wave Expansion Method for determining the imaginary part of the Bloch wave vector (k_(im)) shows increasing kim with increasing metal coating thickness. The following analysis explains and corroborates the enhanced energy confinement effect.
机译：我们研究了TM偏振光在电介质棒的方格中由中心棒的金属涂层造成的缺陷的影响。在超级电池模型中使用平面波扩展方法（PWE）进行的计算表明，缺陷区域中的光子能带结构和场分布随金属层厚度的变化而变化。通过改变金属层的厚度来探索最佳的能量局部化。能量限制的增强是通过具有较厚金属涂层的较窄的空间分布曲线来描述的。根据由中心棒中归一化的集成强度定义的约束质量（CQ）给出的更定量的描述显示，随着金属层厚度的增加，CQ单调增加。对于一个3×3的超级电池，获得的最高CQ值约为80％，大大高于在具有中心棒缺陷的相同电介质PC结构中可获得的44％的最佳值。使用扩展平面波扩展方法进行的进一步计算（以确定Bloch波矢量（k_（im））的虚部）显示，随着金属涂层厚度的增加，kim也随之增加。下面的分析解释并证实了增强的能量约束效果。

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