论文标题
通过光学镊子中的倾斜分层培养基操纵自旋光的横向旋转角动量和Belinfante动量
Manipulating the transverse spin angular momentum and Belinfante momentum of spin-polarized light by a tilted stratified medium in optical tweezers
论文作者
论文摘要
最近，由于旋转和轨道角动量之间的耦合，由于高数字射击物镜将光的紧密聚焦引起的旋转和轨道角动量在光中产生的旋转和轨道角动量之间的耦合而产生的介质和轨道角动量之间的耦合，因此已经利用了结合分层培养基的光学镊子在中镜颗粒中产生复杂的翻译和旋转动力学。在这里，我们考虑了具有倾斜分层介质（与入射光束轴成角度的分层方向的光学镊子系统），并表明对于输入循环极化高斯梁，由此产生的旋转轨道相互作用深深影响横向旋转角动量（TSAM）和Belinfante Momentum of Light＆Magnity and Mampsity的横向旋转旋转角动量（TSAM）的产生。重要的是，我们系统中生成的TSAM由正交成分组成，这与逃生的波和表面等离子体形成了鲜明的对比，其中仅产生了其中一个TSAM组件。由于倾斜而导致的破碎对称性确保，取决于输入梁的螺旋，TSAM的相互正交成分的大小完全取决于倾斜角。在实验中，这可能被证明是对颗粒的外来自旋控制操纵的有效手柄。
In the recent past, optical tweezers incorporating a stratified medium have been exploited to generate complex translational and rotational dynamics in mesoscopic particles due to the coupling between the spin and orbital angular momentum of the light, generated as a consequence of the tight focusing of light by a high numerical aperture objective lens into the stratified medium. Here, we consider an optical tweezers system with a tilted stratified medium (direction of stratification at an angle with the axis of the incident beam), and show that for input circularly polarized Gaussian beams, the resulting spin-orbit interaction deeply influences the generation of transverse spin angular momentum (TSAM) and Belinfante momentum of light, and allows additional control on their magnitude. Importantly, the TSAM generated in our system consists of both the orthogonal components, which is in sharp contrast to the case of evanescent waves and surface plasmons, where only one of the TSAM components are generated. The broken symmetry due to the tilt ensures that, depending upon the helicity of the input beam, the magnitude of the mutually orthogonal components of the TSAM depend entirely on the tilt angle. This may prove to be an effective handle in exotic spin-controlled manipulation of particles in experiments.
