Inserting of any sort of irregularity in a photonic crystal (PC) with a perfect periodicity can produce defect modes. Great interest has been directed towards defect modes due to many potential applications. In this work, a binary PC consisting of silica (SiO 2 ) and silver (Ag) is assumed. The PC is supposed to have a mirror symmetry with the structure (SiO 2 /Ag) N (Ag/SiO 2 ) N , where 2 N is the number of periods of the PC. The transmission spectra of the PC are investigated in the visible and IR wavelengths. It is found that when the thickness of Ag layer increases, band gaps are broadened, more band gaps appear starting at low wavelengths and all these band gaps are shifted toward loner wavelengths. Defect modes appear at certain thicknesses of Ag, diminish gradually and then entirely disappear. When the incidence angle increases, band gaps are blue shifted in contrary to their behavior with the increase of the thickness of the metal and SiO 2 layers.

中文翻译：

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镜面对称金属介电一维光子晶体的缺陷模式和带隙特性

在具有完美周期性的光子晶体 (PC) 中插入任何类型的不规则性都会产生缺陷模式。由于许多潜在的应用，人们对缺陷模式产生了极大的兴趣。在这项工作中，假设由二氧化硅 (SiO 2 ) 和银 (Ag) 组成的二元 PC。PC 应该与结构 (SiO 2 /Ag) N (Ag/SiO 2 ) N 镜像对称，其中 2 N 是 PC 的周期数。在可见光和红外波长下研究了 PC 的透射光谱。发现当银层厚度增加时，带隙变宽，更多的带隙出现在低波长处，并且所有这些带隙都向更长的波长移动。缺陷模式出现在一定厚度的银上，逐渐减少，然后完全消失。当入射角增大时，