Detecting orbital angular momentum through division-of-amplitude interference with a circular plasmonic lens.
Detecting orbital angular momentum through division-of-amplitude interference with a circular plasmonic lens.
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通过圆形等离子体透镜的分幅干涉检测轨道角动量
DOI：
10.1038/srep02402
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发表时间：
2013
影响因子：
4.6
通讯作者：
Guo, Guo-Ping
中科院分区：
文献类型：
--
作者：
Liu, Ai-Ping;Xiong, Xiao;Ren, Xi-Feng;Cai, Yong-Jing;Rui, Guang-Hao;Zhan, Qi-Wen;Guo, Guang-Can;Guo, Guo-Ping
提出了一种利用圆形等离子体透镜探测光的轨道角动量的新方法。由于表面等离子体波和直接透射光之间的分幅干涉现象，在不同OAM激发下，在等离子体透镜表面附近形成特定的强度分布。由于倏逝表面等离子体波和直接透射的相位行为不同，干涉图样随着观察平面远离透镜表面而旋转。旋转方向是OAM符号的直接度量，而旋转量与OAM的绝对值有关。实验和数值分析验证了该OAM检测方案的有效性。推导出的解析表达式，提供这种检测方案的见解和解释。这项工作的基础上，实现了一个紧凑的和集成的OAM检测架构，可以显着有利于光学信息处理的OAM状态。
We demonstrate a novel detection scheme for the orbital angular momentum (OAM) of light using circular plasmonic lens. Owing to a division-of-amplitude interference phenomenon between the surface plasmon waves and directly transmitted light, specific intensity distributions are formed near the plasmonic lens surface under different OAM excitations. Due to different phase behaviors of the evanescent surface plasmon wave and the direct transmission, interference patterns rotate as the observation plane moves away from the lens surface. The rotation direction is a direct measure of the sign of OAM, while the amount of rotation is linked to the absolute value of the OAM. This OAM detection scheme is validated experimentally and numerically. Analytical expressions are derived to provide insights and explanations of this detection scheme. This work forms the basis for the realization of a compact and integrated OAM detection architect that may significantly benefit optical information processing with OAM states.
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