为了实现粒子的非轴向旋转操控，对圆偏振涡旋光的光致旋转特性进行了研究。理论上，利用T矩阵理论，计算光场作用于微粒的光力和力矩，分析圆偏振涡旋光场中自旋角动量和轨道角动量的取向对非轴向旋转效应的影响。研究结果表明：当轨道角动量和自旋角动量的方向相同时，粒子除受轨道矩和轴向自旋矩作用外，还受一个可观的横向自旋矩作用，可以诱导粒子同时做轨道和非轴向自旋运动；当轨道角动量和自旋角动量方向相反，则粒子受到的横向自旋矩难以驱动其做非轴向自旋运动。实验上，利用全息光镊系统捕获微米尺度的粒子，观察到粒子做轨道运动时的非轴向自旋现象，对理论研究结果进行了初步验证。

本文提出了均匀偏振cosh-Pearcey-Gauss 光束，其主要由双曲余弦函数(n, Ω)和偏振相关角度(α,δ)所调制。基于矢量角谱法和稳相法，研究了该光束的远场坡印廷矢量、自旋角动量和轨道角动量。研究结果表明：较大的双曲余弦函数值能将远场坡印廷矢量、自旋角动量和轨道角动量分割成多瓣抛物线结构。虽然左旋和右旋椭圆偏振不能影响整个光束结构，但却可通过调节TE和TM项的左半边和右半边的分布权重，进而分辨出光束的远场坡印廷矢量和角动量分布。本文结果对信息存储与偏振成像技术领域有着潜在的应用价值。

As an inherent degree of freedom, total angular momentum (TAM) of photons consisting of spin angular momentum and orbital angular momentum has inspired many advanced applications and attracted much attention in recent years. Probing TAM and tailoring beam’s TAM spectrum on demand are of great significance for TAM-based scenarios. We propose both theoretically and experimentally a TAM processor enabling tunable TAM manipulation. Such a processor consists of a set of quasi-symmetric units, and each unit is composed of a couple of diffraction optical elements fabricated through polymerized liquid crystals. Forty-two single TAM states are experimentally employed to prove the concept. The favorable results illustrate good TAM state selection performance, which makes it particularly attractive for high-speed large-capacity data transmission, optical computing, and high-security photon encryption systems.

目前，具有螺旋相位波前和环状光强分布的涡旋光束已在光学领域获得了广泛应用，其产生与调控自然成了研究的热点。利用三维粒子模拟程序对双色拉盖尔高斯激光驱动固体等离子激发同时携带自旋角动量与轨道角动量的高次谐波的物理过程进行了研究，根据高次谐波产生过程中的光子能量与角动量守恒定律对其内在物理机制进行了理论分析，并讨论了对谐波阶次、偏振态（自旋角动量）以及拓扑荷数（轨道角动量）进行调控的方法。研究结果为开发高亮度、超短超快、短波长、自旋与轨道角动量可调控的涡旋光束辐射源提供了理论依据，在光学微操控、超分辨成像、光通信以及离子加速等领域具有较大的实际应用前景。

结合角谱展开方法和矢量势方法，推导了拉盖尔高斯涡旋光束在石墨烯表面反射后的电磁场分量显式表达式。分析了光束的入射角和拓扑荷数，以及石墨烯-衬底系统的费米能量和磁场对涡旋光束在石墨烯表面反射后局域动力学特性的影响。数值结果表明，石墨烯表面反射涡旋光束的能量、动量、自旋/轨道角动量密度分布随着光束入射角和拓扑荷数的变化发生显著变化。同时，改变石墨烯-衬底系统的费米能量和磁场可以有效调节反射涡旋光束的局域动力学特性。为基于涡旋光束局域动力学特性对石墨烯的表征以及基于石墨烯对涡旋光束的调控奠定了理论基础。

Emerging as a family of waves, Janus waves are known to have “real” and “virtual” components under inversion of the propagation direction. Although tremendous interest has been evoked in vortex beams featuring spiral wavefronts, little research has been devoted to the vortex beam embedded Janus waves, i.e., Janus vortex beams. We propose a liquid crystal (LC) Pancharatnam–Berry (PB) phase element to demonstrate the realization of the Janus vortex beams and the modulation of the associated orbit angular momentum (OAM) and spin angular momentum (SAM). The generated Janus vortex beams show opposite OAM and SAM states at two distinct foci, revealing a spin-orbit interaction during propagation enabled by the LC PB phase element, which may play special roles in applications such as optical encryption and decryption. Other merits like reconfigurability and flexible switching between Janus vortex beams and autofocusing or autodefocusing vortex beams additionally increase the degree of freedom of manipulating vortex beams. This work provides a platform for tailoring complex structured light and may enrich the applications of vortex beams in classical and quantum optics.

研究了X型涡旋光束在左旋/右旋圆偏振状态下在紧聚焦系统中的传播特性，讨论了自旋-轨道相互作用下焦平面光强的横向焦移和传播方向旋转现象的特点及其调控方法。研究发现：相位分布因子c是X型涡旋光束产生横向焦移和光强旋转的主要原因，而半孔径角α、偏振态和拓扑荷数对光强分布均有调控作用；由于自旋-轨道相互作用，入射光为左旋圆偏振态与右旋圆偏振态时，聚焦场光强分布差异明显，相同点是焦平面上光强的轴向转折点均为csw=1，这与入射光为线偏振态时轴向转折点不同；在二阶情况下，虽然入射光为左旋和右旋圆偏振时，两者的横向焦移与光强旋转不同，但是两者的主要涡旋点的分布及其旋转行为是一致的。本文研究可为结构光场的调控提供参考。