A study on photonic crystal slab waveguide with absolute photonic band gap
A study on photonic crystal slab waveguide with absolute photonic band gap
复制标题
DOI：
10.3934/matersci.2018.1.116
复制
发表时间：
2018-01
影响因子：
1.8
通讯作者：
Yoshiki Shimokawara;Yasuhide Tsuji;K. Hirayama
中科院分区：
文献类型：
--
作者：
Yoshiki Shimokawara;Yasuhide Tsuji;K. Hirayama
传统的光子晶体平板波导中，大多数仅对两个正交偏振态中的一个偏振态具有光子带隙。本文研究了在同一频率范围内实现两种偏振态的绝对光子带隙，并证明了在本文提出的光子晶体结构中可以实现绝对光子带隙。在PhC结构的数值分析和设计中，我们采用基于有效指数法（EIM）的二维有限元法（FEM）。首先，我们提出了两种具有绝对PBG的PhC结构，并证明了在获得宽带绝对PBG方面，转向型PhC上级空气环型PhC。优化后的导向型光子晶体在中心波长为1.55 μm处具有164nm的绝对带隙。在此基础上，我们设计了具有绝对光子带隙的光子晶体波导，以获得相同波长范围内两种偏振态的导模。研究了所设计的光子晶体波导的传输特性，并设计了紧凑型光子电路所需的60度弯曲。这些结果表明，实现紧凑型偏振复用光子器件的可能性。
Most of the conventional photonic crystal (PhC) slab waveguides have a photonic bandgap (PBG) only for one polarization state of two orthogonal polarization states. In this paper, westudy on an absolute PBG that can realize PBG for both polarizations in the same frequency range anddemonstrate that an absolute PBG can be realized in PhC structures proposed here. In the numericalanalysis and design of PhC structures, we employ the two-dimensional finite element method (FEM)based on the effective index method (EIM). First, we propose two-types of PhC structures with anabsolute PBG and show that a steering type PhC is superior to an air-ring type PhC to obtain a widebandabsolute PBG. It is also shown that the optimized steering type PhC has the absolute PBG whosebandwidth of 164 nm at the center wavelength of 1.55 μm. Furthermore, we design PhC waveguidesbased on the obtained PhC structure having an absolute PBG in order to obtain guided modes for bothpolarization states within the same wavelength range. The transmission properties of the designed PhCwaveguides are also investigated and 60 degree bends which are required in compact photonic circuitsare designed. From these results, the possibility to realize compact polarization multiplexing photonicdevices is shown.