紧凑型光学涡旋发射装置设计  

Compact Optical Vortex Launcher Design

作　　者：钱峻 

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海

出　　处：《建模与仿真》2023年第4期3319-3326,共8页Modeling and Simulation

摘　　要：硅基集成平台由于其较高的折射率差,适合用于大规模、小尺寸、高密度器件的集成。本文提出了一种基于硅基光子学的光学涡旋发射装置,工作波长在1600~1800 nm范围,通过改变输入光的波长可以输出不同拓扑荷的涡旋光束。同时,通过在环形波导外侧壁刻蚀二阶布拉格光栅的方法,克服了固有的高折射率对比度带来的左旋圆偏振光和右旋圆偏振光的叠加问题,得到了高纯度的单一圆偏振标量涡旋光束。The silicon-based integration platform is suitable for the integration of large-scale, small-size, and high-density devices due to its higher refractive index difference. In this paper, an optical vortex emission device based on silicon-based photonics is proposed, operating in the wavelength range of 1600~1800 nm, and vortex beams with different topological charges can be output by changing the wavelength of the input light. Meanwhile, by etching a second-order Bragg grating on the outer sidewall of the ring waveguide, the superposition of left- and right-hand circularly polarized light brought by the inherent high refractive index contrast is overcome, and a single circularly polarized scalar vortex beam of high purity is obtained.

关 键 词：光学涡旋 涡旋光束 环形波导 圆偏振 拓扑荷 布拉格光栅 折射率差 发射装置 

分 类 号：O43[机械工程—光学工程]