全光纤光子轨道角动量模式研究

发布时间：2018-04-09 05:27

本文选题：光子轨道角动量　切入点：有效介质理论　出处：《华南师范大学学报(自然科学版)》2014年06期

【摘要】：通过模分复用技术,将带有不同阶数轨道角动量的光波作为不同的信道,实现从另一维度极大地增加光通信的容量.光子轨道角动量的产生是这类技术的一个核心.基于有效介质理论,在光纤端面设计了特殊的螺旋结构,使光纤端面的有效折射率沿着顺时针或逆时针方向线性增加.当传导光波入射到该结构时,因方位角上的折射率不同而形成光程的差异,引起相应的相位延迟并形成相位波前的螺旋形结构,即产生带有轨道角动量的光波,采用FDTD方法模拟了轨道角动量的产生过程.
[Abstract]:By means of module division multiplexing, the optical waves with different order orbital angular momentum are used as different channels to greatly increase the capacity of optical communication from another dimension.The generation of photon orbital angular momentum is a core of such techniques.Based on the theory of effective medium, a special spiral structure is designed on the fiber end surface, which makes the effective refractive index of the fiber end surface increase linearly in the clockwise or counterclockwise direction.When the transmitted light wave is incident to the structure, the difference of optical path is formed because of the different refractive index in the azimuth, which results in the corresponding phase delay and the formation of the spiral structure of the phase wave front, that is, the light wave with orbital angular momentum.The generation process of orbital angular momentum is simulated by FDTD method.
【作者单位】：华南师范大学华南先进光电子研究院;
【基金】：国家自然科学基金项目(61307053) 中国博士后基金项目(2013M531866)
【分类号】：TN929.1

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