中国激光, 2015, 42 (1): 0105001, 网络出版: 2014-12-11
GeSbSe光子晶体波导结构设计及传输特性研究
Investigation of Structure Design and Transmission Characteristic of GeSbSe Photonic Crystal Waveguides
光学设计 光子晶体波导 硫系玻璃 光子禁带 平面波展开法 optical design photonic crystal waveguides chalcogenide glass photonic band gap plane wave expansion method
摘要
利用平面波展开法计算GeSbSe 基质光子晶体带隙,研究光子晶体波导中带隙与空气孔(或介质柱)半径的变化关系,并结合光子晶体波导的工作波长,设计出周期为500 nm,半径为150 nm 的三角晶格空气孔型GeSbSe 光子晶体波导。采用时域有限差分法模拟所设计的直线型光子晶体波导和60°弯曲光子晶体波导的传输特性,模拟结果显示在传统结构光子晶体波导中,直线型光子晶体波导具有很高的光学传输效率,但在60°弯曲型波导中的传输效率较低,分析原因为光子晶体波导直线区域与弯曲区域光的传播模式不同。因此对60°弯曲型GeSbSe光子晶体波导进行了结构优化,优化后的光子晶体波导可以在较宽的波长范围内具有很高的传输效率。
Abstract
The plane wave expansion method is used in this paper to calculate the photonic band gap based GeSbSe and the relationship between the photonic band gap and the air holes (or media column) in photonic crystal waveguides is studied. Combining with the operating wavelength of photonic crystal waveguides, the period of 500 nm and the radius of air holes of 150 nm in a triangular lattice are determined. The twodimensional finite difference time domain method is induced to simulation the transmission characteristics both in straight and 60° bend waveguides, and the results show that the transmission efficiency in straight waveguides is much higher than those in bend waveguides. The reasons may be there are different propagation modes between straight parts and bend parts in photonic crystal waveguides. Finally, the structures of 60° bend waveguides are optimized and the results show that there is an excellent transmission efficiency in a wide range of wavelengths in photonic crystal waveguides based GeSbSe.
王贤旺, 张巍, 韩金涛, 魏凤娟, 张培晴, 吴越豪, 章亮, 戴世勋, 徐铁峰. GeSbSe光子晶体波导结构设计及传输特性研究[J]. 中国激光, 2015, 42(1): 0105001. Wang Xianwang, Zhang Wei, Han Jintao, Wei Fengjuan, Zhang Peiqing, Wu Yuehao, Zhang Liang, Dai Shixun, Xu Tiefeng. Investigation of Structure Design and Transmission Characteristic of GeSbSe Photonic Crystal Waveguides[J]. Chinese Journal of Lasers, 2015, 42(1): 0105001.