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Physical Optics
摘要
Orbital angular momentum (OAM), as a fundamental parameter of a photon, has attracted great attention in recent years. Although various properties and applications have been developed by modulating the OAM of photons, there is rare research about the non-uniform OAM. We propose and generate a new kind of continuously tunable azimuthally non-uniform OAM for the first time, to the best of our knowledge, which is carried by a hybridly polarized vector optical field with a cylindrically symmetric intensity profile and a complex polarization singularity. We also present the perfect vector optical field carrying non-uniform OAM with a fixed radius independent of topological charges, which can propagate steadily without radial separation, solving the problem of the unsteady propagation due to the broadened OAM spectrum of the non-uniform OAM. This new kind of tunable non-uniform OAM with a cylindrical symmetric intensity profile, complex polarization singularity, and propagation stability enriches the family of OAMs and can be widely used in many regions such as optical manipulation, quantum optics, and optical communications.
Chinese Optics Letters
2020, 18(12): 122601
        
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摘要
Frontiers of Optoelectronics
2019, 12(1): 88
Physical Optics
Peng Li  Dongjing Wu  Yi Zhang  Sheng Liu  [ ... ]Yu Li  Shuxia Qi  Jianlin Zhao  
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摘要
Photonics Research
2018, 6(7): 756
Polarization
摘要
Photonics Research
2018, 6(4): 228
Surface Plasmons
摘要
Photonics Research
2018, 6(3): 157
摘要
In this work, an all-fiber-based mode converter for generating orbital angular momentum (OAM) beams is proposed and numerically investigated. Its structure is constructed by cascading a mode selective coupler (MSC) and an inner elliptical cladding fiber (IECF). OAM modes refer to a combination of two orthogonal LPlm modes with a phase difference of ±π/2. By adjusting the parameters and controlling the splicing angle of MSC and IECF appropriately, higher-order OAM modes with topological charges of l = ±1, ±2, ±3 can be obtained with the injection of the fundamental mode LP01, resulting in a mode-conversion efficiency of almost 100%. This achievement may pave the way towards the realization of a compact, all-fiber, and high-efficiency device for increasing the transmission capacity and spectral efficiency in optical communication systems with OAM mode multiplexing.
Opto-Electronic Advances
2018, 1(7): 180003-1
光束传输与控制
李新忠  台玉萍  李贺贺  王静鸽  [ ... ]聂兆刚  汤洁  王辉  尹传磊  
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摘要
利用矢量波分析法对分数阶高阶贝塞尔涡旋光束(FBV)的电矢量特性进行了研究。在紧聚焦和非紧聚焦条件下,研究了拓扑荷(TCs)增量为0.1阶、拓扑荷从2.1增到3的过程中,Ex、Ey、Ez三个电场分量强度图的变化情况。进而对比分析了TCs值为整数阶和半整数阶FBV光束在由紧聚焦向非紧聚焦过渡过程中Ex分量强度的变化情况。数值模拟结果表明,紧聚焦和非紧聚焦情况下,三个分量的电场强度分布差异较大,其亮环圆对称性均遭到破坏;非紧聚焦情况下,Ex分量的圆对称性增强,而Ey、Ez分量与紧聚焦条件下的光强分布基本相同;在由紧聚焦向非紧聚焦过渡过程中,Ex分量整数阶TCs光束亮环圆对称性逐渐增强,而半整数阶TCs光束亮环结构基本不变,仅存在缩放关系。
中国激光
2016, 43(6): 605002
物理光学
唐碧华  郑尚彬  贺兵  张勇  [ ... ]罗亚梅  高曾辉  
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摘要
光场的相位奇异特性是奇点光学研究的重要内容。运用广义惠更斯-菲涅耳衍射积分公式,推导得到异常空心光束通过像散透镜后的光场分布表达式和相位奇点分布表达式,并研究了其在几何焦平面的相位奇异特性。结果表明,异常空心光束通过像散透镜后,在几何焦平面上存在相位奇点,且相位奇点受到透镜的像散系数和光束束腰宽度等参数控制。在一定条件下,几何焦平面上会出现椭圆或圆刃型位错线、光涡旋。当像散系数或束腰宽度改变时,椭圆或圆刃型位错线发生变化,光涡旋也会发生移动、湮灭和产生。
光学学报
2016, 36(8): 826001
“光场调控、传输及其应用”专题
陈鹏  徐然  胡伟  陆延青  
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摘要
由于特种光束的独特性质和丰富应用,光场调控技术近年来得到了越来越广泛的关注。设计特定结构调控普通高斯光束的振幅、相位或偏振方向,可以得到一系列特殊光场。利用一种偏振敏感的光取向材料,基于动态缩微投影曝光系统的液晶光控取向技术,可实现精确、任意和可重构的液晶方位角的取向控制。基于该项技术制备了二值或渐变的液晶微结构元件,对入射光场的各个参量维度进行调控,产生了高品质、高效率的涡旋光束、矢量光束和艾里光束。利用该项技术制备的器件具有成本低廉、轻便集成、电光可调、偏振可控和宽波段适用等特点。综述了本课题组近期在该领域的系列研究工作,或将为光场调控技术带来全新的可能,为液晶光学器件带来更广泛的应用。
光学学报
2016, 36(10): 1026005
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摘要
以傍轴高斯涡旋光束为例,对部分相干涡旋光束的磁场在源平面的光谱Stokes奇点变化规律做了研究,并与部分相干光束电场的光谱Stokes奇点做了比较。研究结果表明,部分相干高斯涡旋光束在源平面内,存在着磁场和电场的光谱Stokes奇点。适当改变光束束腰宽度以及离轴量等光束控制参数会出现磁场和电场的光谱Stokes奇点的移动、产生和湮灭。与部分相干光束电场的光谱Stokes奇点比较表明,二者并不重合且拓扑电荷不同,但具有一定的对称性。磁场和电场的光谱Stokes奇点在变化过程中满足拓扑关系。
中国激光
2015, 42(7): 702004
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