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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.
A novel hexagonal honeycomb structure photonic crystal heterostructure is designed by using two characteristics of large-scale absolute bandgap in the honeycomb structure photonic crystal. The band structure characteristic of the heterojunction is studied by the combination of plane wave expansion and supercell. The structure of heterojunction and the corresponding band diagram are given. The conduction mode of the heterojunction interface is analyzed. The influence of the lateral structure on the conduction mode is studied. The feasibility of these structures is discussed. The calculated results show that there is a guided mode in the absolute bandgap without any lattice movement, and the transverse lattice opening of the two structures has a great influence on the guided modes, but the effect of lateral slippage is smaller .