六角蜂窝结构光子晶体异质结带隙特性研究

利用蜂窝结构光子晶体具有两个范围较大绝对带隙的特性，设计新型六角蜂窝结构光子晶体异质结，采用平面波展开和超晶胞相结合的方法来研究异质结的能带结构特性.给出异质结的结构和相应的能带图，分析异质结界面传导模，研究两侧结构作横向拉开和侧向滑移时对传导模的影响，讨论这些结构的实际可行性.计算结果表明，没有任何晶格移动，此种结构异质结在绝对带隙中就有导模存在，两边晶格横向拉开对导模影响较大，而侧向滑移的影响则较小. 关键词： 光子晶体 异质结 光子带隙 超晶胞

Analysis of band gap in honeycomb photonic crystal heterostructure

In the present paper, a new kind of honeycomb photonic crystal heterostructure(PCH) is proposed. The band gap structure of this photonic crystal heterostructure is investigated with supercell technique based on the plane-wave expansion method. The configuration of heterostructure and the corresponding band structures are obtained and the guide modes are analyzed. Furthermore, the influences of longitudinal sideslipping and transverse displacement of lattices on the band gap structures are discussed. It may provide a new configuration to generate guide modes. The achieved results show that the guide modes can exist in this heterostructure without any shift of lattices, and guide modes are highly sensitive to transverse shift, while sideslipping affects guide modes only slightly.