提出了一种基于圆环杆与平板连杆的二维正方晶格光子晶体结构, 讨论了绝对禁带的计算过程和各参数对绝对禁带宽度的影响.通过平面波展开法结合逐次逼近方法发现其最大绝对禁带相对值达到19.026%, 比采用圆柱杆和平板连杆结构的二维正方晶格光子晶体以及采用圆环杆但无连杆的二维正方晶格光子晶体的最大绝对禁带相对值分别提高10.181%和712.035 9%; 圆环杆的外径、圆环的相对厚度以及连杆的宽度都存在一个最佳值, 且连杆宽度对绝对禁带相对值的影响比较敏感.

A square-lattice photonic crystal structure was proposed based on circular-ring cylinders and thin cross plates.The calculation process and the influence of operating parameters on the absolute bandgaps were presented.It is demonstrated through plane wave expansion method combined with cut-and-try method that its maximum relative absolute photonic bandgap reaches 19.026%,which is 10.181% and 712.035 9% higher than that in a PhC made of solid cylinder and connecting veins and that in a PhC made of dielectric rings,respectively.And there exist optimum values for the outer radius of the circular-ring cylinders,the relative ring thickness,and the thickness of the cross plates.Furthermore,the influence of the thickness of the cross plates on the relative APBG is quite sensitive.