全带隙六边形晶格二维光子晶体结构研究

提出了一种具有全带隙的光子晶体结构。基于GaAs材料的六角晶格结构，将各格点之间用特定宽度的介质波导相连，可构成具有全带隙的光子晶体结构。在此基础上，引入空心格点，将有效增大全带隙宽度。使用平面波展开法对该结构进行了理论分析。仿真结构表明，最大绝对禁带宽度??为0.0619?e(a是晶格常数，c是光速,?e=2πc/a )，禁带中心频率?mid为0.663?e，相对禁带宽度为??/?mid=9.3%。采用该结构，可以有效构造出全带隙，避免了光子晶体结构偏振选择特性。

Complete Bandgap of two-dimensional Photonic Crystal based on Hexagonal Lattice

A complete bandgap photonic crystal based on hexagonal lattice has been presented in this paper. Based on hexagonal lattice with GaAs material, we connect the lattice with waveguide and add the hollow structure in the crystal lattice. The modified plane-wave expansion method is used to calculate the band structure, The simulation results shows that its maximum absolute bandgap ?? is 0.0619?e, the middle frequency of the band gap is 0.663?e, and the relative bandgap is 9.3%. Compared to the ordinary hexagonal lattice structure, the novel photonic crystal structure owns a large absolute bandgap and relative bandgap.