Author Affiliations
Abstract
School of Information and Control Engineering, China University of Mining and Technology, Xuzhou 221116, China
Toroidal multipole is a special current distribution that has many different characteristics from electric multipole and magnetic multipole distributions. Because of its special properties, the toroidal dipole is a research hotspot in the field of metamaterials and nanophotonics. However, the low scattering of the toroidal dipole moment makes its excitation a challenging task. At present, there are relatively few studies on its specific engineering applications. In this paper, by slotting in the rectangular cavity, the excitation of an equivalent toroidal dipole is successfully achieved over a wide frequency range of 53–58 GHz. Results indicate that under the action of the toroidal dipole, the TE10 mode electromagnetic waves transmitted in the rectangular waveguide are converted into vector beams and are radiated outwards. Further adjusting the spatial distribution of the magnetic dipoles in the toroidal dipoles yields results that indicate that the resonance mode in the slot is still dominated by the magnetic toroidal dipole moment, and the electromagnetic waves radiating outward are vortex beams carrying vector polarization. The scattered energy of each dipole moment inside the antenna is calculated. This calculation verifies that the mass of the vector beam and vector vortex beam is closely related to the toroidal dipole supported by this antenna. The proposed structure can be applied to explorations in vortex filtering, in photon entanglement, and in the photonic spin Hall effect.
toroidal dipole vector beams vector vortex beams 
Chinese Optics Letters
2024, 22(1): 011601
作者单位
摘要
武汉理工大学理学院,湖北 武汉 430070
对非傍轴条件下光学角动量及自旋-轨道耦合的研究有助于人们认识亚波长结构中的光现象,近场中的倏逝波也可能产生强烈的自旋-轨道耦合。基于角谱衍射理论和Parseval定理,详细分析了高阶庞加莱球上拉盖尔-高斯矢量涡旋光束的传播波、倏逝波和角动量的近场演化特性以及倏逝波引起的自旋-轨道耦合。结果表明,在亚波长束腰宽度光束的源平面附近倏逝波作用强烈,在总光场中占主导地位。此外,近场中的轨道角动量同时包含横向电场和纵向电场的贡献,倏逝波中横向自旋角动量和横向偏振态相关,且存在自旋方向锁定现象。该研究为矢量涡旋光束在亚波长结构中的研究和应用提供了理论依据。
物理光学 自旋-轨道耦合 角动量 倏逝波 矢量涡旋光束 高阶庞加莱球 physical optics spin-orbit coupling angular momentum evanescent waves vector vortex beams higher-order Poincaré sphere 
激光与光电子学进展
2022, 59(7): 0726001
Author Affiliations
Abstract
1 Sapienza Università di Roma, Dipartimento di Fisica, Rome, Italy
2 Università degli Studi Roma Tre, Dipartimento di Scienze, Rome, Italy
3 Consiglio Nazionale delle Ricerche, Istituto dei Sistemi Complessi, Roma, Italy
4 Technische Universität München, Biological Imaging and Center for Translational Cancer Research, Munich, Germany
5 Institute of Biological and Medical Imaging, Helmholtz Zentrum München, Neuherberg, Germany
6 Medical University of Vienna, Department of Biomedical Imaging and Image-Guided Therapy, Molecular and Gender Imaging Service, Vienna, Austria
7 Ben-Gurion University of the Negev, Department of Electrical and Computer Engineering, Beer Sheva, Israel
Scattering phenomena affect light propagation through any kind of medium from free space to biological tissues. Finding appropriate strategies to increase the robustness to scattering is the common requirement in developing both communication protocols and imaging systems. Recently, structured light has attracted attention due to its seeming scattering resistance in terms of transmissivity and spatial behavior. Moreover, correlation between optical polarization and orbital angular momentum (OAM), which characterizes the so-called vector vortex beams (VVBs) states, seems to allow for the preservation of the polarization pattern. We extend the analysis by investigating both the spatial features and the polarization structure of vectorial optical vortexes propagating in scattering media with different concentrations. Among the observed features, we find a sudden swift decrease in contrast ratio for Gaussian, OAM, and VVB modes for concentrations of the adopted scattering media exceeding 0.09%. Our analysis provides a more general and complete study on the propagation of structured light in dispersive and scattering media.
orbital angular momentum scattering phenomena turbulent media optical polarization vector vortex beams 
Advanced Photonics
2020, 2(3): 036003
作者单位
摘要
武汉理工大学理学院, 湖北 武汉 430070
提出了一种基于马赫-曾德尔干涉仪(MZI)产生高阶庞加莱球上任意矢量涡旋光束的方法。利用半波片和偏振分光棱镜组合调节支路光束振幅, 搭配常用的两个半波片组调节合成光束的相位, 进而生成并变换矢量涡旋光束, 优化了传统的实验光路, 降低了光束能量损耗, 利用1/4波片实现不同高阶庞加莱球上矢量涡旋光束的变换。与现有的基于马赫-曾德尔干涉仪矢量光束生成方法比较, 该光路结构简单, 光束转换效率提高。在理论上, 通过琼斯矩阵计算, 在拓扑荷数为m=±1高阶庞加莱球上得到了各矢量涡旋光束的偏振态。根据该方法搭建了一套矢量涡旋光束产生的实验光路, 实验结果与理论分析一致, 证明了这种方法的实用性。
物理光学 矢量涡旋光束 马赫-曾德尔干涉仪 高阶庞加莱球 physical optics vector vortex beams Mach-Zender interferometer high order Poincare sphere 
中国激光
2018, 45(1): 0105001
作者单位
摘要
北京航空航天大学电子信息工程学院, 北京 100191
提出了基于琼斯矩阵的矢量涡旋光偏振态的庞加莱球表示方法。应用琼斯矩阵法建立了基于圆偏振涡旋基矢的矢量涡旋光束的电场矢量分布模型。分析了光束的拓扑荷和方位角对矢量涡旋光束偏振态的影响,给出了不同拓扑荷的矢量涡旋光束偏振态的庞加莱球表示方法。与传统的利用斯托克斯参量建立的高阶庞加莱球表示方法相比,矢量涡旋光束描述方法的物理意义更加清晰明了。求解电场矢量的亥姆霍兹方程,发现该光束电场矢量的振幅服从贝塞尔高斯分布。
物理光学 光电子学 庞加莱球 琼斯矩阵 矢量涡旋光束 physical optics optoelectronics Poincaré sphere Jones matrix vector vortex beams 
光学学报
2013, 33(12): 1226001

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