光学腔模中的旋转诱导涡旋

Slow phonon vortices and defect modes in periodic nano-waveguides

We identify a broad class of phonon modes with persistent vortex fluxes at arbitrarily slow propagating velocities in periodic nano-waveguides. Such phonon vortices are associated with the split band-edges in dispersion dependencies, which can be engineered by waveguide design. Modulations introduced in such waveguides can support a pair of defect cavity phonon modes with an arbitrarily small frequency splitting. These features can find applications for sensing and nano-manipulation.

Frequency splitting of polarization eigenmodes in microscopic Fabry-Perot cavities

We study the frequency splitting of the polarization eigenmodes of the fundamental transverse mode in CO2 laser-machined, high-finesse optical Fabry-Perot cavities and investigate the influence of the geometry of the cavity mirrors. Their highly reflective surfaces are typically not rotationally symmetric but have slightly different radii of curvature along two principal axes. We observe that the eccentricity of such elliptical mirrors lifts the degeneracy of the polarization eigenmodes. The impact of the eccentricity increases for smaller radii of curvature. A model derived from corrections t…

Exceptional points in anisotropic planar microcavities

Planar microcavities allow the control and manipulation of spin-polarization, manifested in phenomena like the optical spin Hall effect due to the intrinsic polarization mode splitting. Here, we study a transparent microcavity with broken rotational symmetry, realized by aligning the optical axis of a uniaxial cavity material in the cavity plane. We demonstrate that the in-plane optical anisotropy gives rise to exceptional points in the dispersion relation, which occur pair-wise, are circularly polarized, and are cores of polarization vortices. These exceptional points are a result of the non-…

具有囚禁势的二维Ginzburg-Landau模型的稳定拓扑模

Stable topological modes in two-dimensional Ginzburg-Landau models with trapping potentials

激光介质的复Ginzburg-Landau（CGL）模型（具有五阶非线性）不包含有效扩散项，这使得所有涡旋孤子在这些模型中都是不稳定的。最近，它已被证明，增加了二维周期性的潜在的，这可能是由一个横向光栅在激光腔中，CGL方程稳定的复合（四峰）涡，但最基本的“火山口形”涡（CSV），别名涡环，这是，基本上，被压缩到一个单一的细胞的潜力，还没有被发现之前在一个稳定的形式。在这项工作中，我们报告家庭的稳定紧凑的CSVs涡量S=1的CGL模型与外部潜在的两种不同类型：轴对称抛物陷阱，和周期性的潜力。在这两种情况下，我们确定的稳定区域的CSV和基本孤子（S=0）。那些在轴对称势场中不稳定的CSV分裂成坚固的偶极子。所有S=2的涡都是不稳定的，分裂成三极。确定了偶极子和三极子的稳定区域。周期势也不能稳定S>=2的CSV;相反，发现了稳定的紧凑方形四极子家族。

椭圆高斯光束的涡旋轨迹

Optical vortex trajectories in an astigmatic and elliptical Gaussian beam

在光束中的一个点处产生的光学涡旋将通过光学系统传播到涡旋可以用于某种目的的另一个点。然而，这种系统中的非对称光学元件可能导致像散或至少破坏光束的旋转对称性，这可能以不期望的方式影响涡旋的传播。当旋转对称的、消像散的高斯光束中的光学涡旋保持其初始形态直到其传播时，非对称或消像散的高斯光束中的光学涡旋的形态发生变化。这个涡旋甚至可以被另一个具有相反拓扑电荷的涡旋所取代。我们考虑了非对称和/或非对称高斯光束中单个非正则涡旋的行为。给出了涡轨迹的一般表达式。翻转平面的位置和涡的各向异性的演变被认为是不同的非理想情况。

Spontaneous generation and active manipulation of real-space optical vortex

Optical vortices host the orbital nature of photons, which offers an extra degree of freedom in photonic applications. Unlike vortices in other physical entities, optical vortices require structural singularities, which restrict their abilities in terms of dynamic and interactive characteristics. In this study, we present the spontaneous generation and external magnetic field-induced manipulation of an optical vortex and antivortex. A gradient-thickness optical cavity (GTOC) consisting of an Al/SiO2/Ni/SiO2 multilayer structure realised the distinct transition between the trivial and non-trivi…

用于强光-物质耦合与拓扑相位奇点的MoS$_2$基垂直堆叠腔中的法布里-珀罗共振模式

Fabry-Perot resonance modes in a MoS$_2$-based vertical stacking cavity for strong light-matter coupling and topological phase singularity

本研究构建了介电材料与单层MoS₂交替的垂直堆叠腔，突破传统堆叠限制，可调控法布里-珀罗共振模式，实现强光-物质耦合与多重完美吸收，并产生可调控的拓扑配对相位奇点，为相关光学研究提供灵活框架。

Optical vortex Brillouin laser

Optical vortices, which have been extensively studied over the last decades, offer an additional degree of freedom useful in many applications, such as optical tweezers and quantum control. Stimulated Brillouin scattering, providing a narrow linewidth and a strong nonlinear response, has been used to realise quasi-continuous wave (CW) lasers. Here, we report stable oscillation of optical vortices and acoustic modes in a Brillouin laser based on chiral photonic crystal fibre, which robustly supports helical Bloch modes (HBMs) that carry circularly-polarized optical vortex and display circular b…

涌现高维光学涡旋的动态实现

Dynamic realization of emergent high-dimensional optical vortices

本文提出高维梯度厚度光学腔（GTOC），利用金属-电介质多层膜的光学耦合在三维及以上广义参数空间中实现并实验观测高维光学涡旋结构及其拓扑转变，为高维物理模拟和有源拓扑光子器件开发提供新途径。

傍轴高精细度腔中布拉格诱导轨道angular-momentum混频

Bragg-induced orbital angular-momentum mixing in paraxial high-finesse cavities

对平凹微腔矢量电磁模的数值计算表明，平面布拉格反射镜的偏振相关反射率会导致名义傍轴模产生意想不到的腔场分布。即使在旋转对称共振器中，某些轨道角动量对也必然以与激发无关的方式混合以形成双重态。一个特征的混合角被确定，即使在近轴的限制，可以被设计为具有大的值。这种对高斯理论的修正在偏离傍轴性方面是零阶的。我们讨论了由此产生的非均匀偏振场。观测将需要具有足够高Q值的小腔。提出了可能的应用。

螺旋波导轴附近光学气泡的稳定性研究

Stabilization of Optical Bubbles Near the Axis of a Helical Waveguide

该研究通过数值模拟发现，螺旋波导内散焦克尔介质中描述傍轴光圆偏振相互作用的耦合非线性薛定谔方程存在带涡旋的稳定旋转光学气泡解，其横向轮廓由波导参数、涡旋数和背景强度决定。