摘要
研究了具有二重旋转对称性的椭圆介质柱光子晶体的宽带全角准直色散特性及其在分束器方面的应用。利用平面波展开法计算其色散关系,发现该类结构的TE偏振模式在较宽的带宽内存在跨越整个第一布里渊区的平直等频线,利用这些平直等频线实现了宽带全角超准直光传输。在此基础上设计了一种Y型能量分束器,时域有限差分(FDTD)仿真结果表明,该分束器对内置二维点光源和高斯光源均具有很好的分束性能。以上研究在光子器件集成、定向耦合等领域具有潜在的应用价值。
The broadband all-angle super collimation dispersion properties of two-dimensional （2D） elliptical photonic crystal structures with two-fold rotational symmetry and its applications in power splitters are studied. Its dispersion relation is calculated by the plane wave expand method. The calculated results show that there exist straight-like equi-frequency lines spanning over the whole first Brillouin zone within a relative broad band for TE polarization. These straight-like equi-frequency lines are used to realize broadband all-angle super collimation transmission. Based on the above results, one kind of Y-shape power splitter is designed. Finite-difference Time- domain simulations reveal that this Y-shape splitter has good performance for 2D point source and Gaussian source. The above results have great potential in photonic devices integration and directional coupling.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2015年第11期219-225,共7页
Acta Optica Sinica
基金
国家自然科学基金(11504114
11247253)
中央高校基本科研业务费专项资金(2015ZZ056)
华南理工大学教研教改项目(Y1141830)
第二批探索性实验教学项目(Y1150620)
华南理工大学--工业和信息化部电子第五研究所大学生校外创新实践基地项目
关键词
材料
光子晶体
对称性
超准直效应
能量分束器
materials
photonic crystals
symmetry
super-collimation effect
power splitters
