椭圆偏振控制的光矩

非均匀光束中的光学力和力矩

Optical forces and torques in non-uniform beams of light

椭圆偏振光束中的自旋角动量在光阱中起着几个值得注意的作用。它对非均匀光束中的线动量密度有贡献，从而对施加在被照射物体上的辐射压力有贡献。它可以转换成轨道角动量，因此即使在光学各向同性物体上也可以施加扭矩。此外，它的旋度对力和力矩都有贡献，而没有自旋到轨道的转换。我们通过跟踪椭圆偏振光镊中扩散的胶体球来实验证明这些效应。一簇一簇的球体围绕着光束的轴线确定性地旋转。相比之下，一个单一的球体，经历随机布朗涡旋循环，映射出光学力场。

集成光子器件中光子自旋angular momentum和光矩的光机测量

Optomechanical measurement of photon spin angular momentum and optical torque in integrated photonic devices

光子携带线动量，并且在圆偏振或椭圆偏振时旋转角动量。在光与物质相互作用过程中，线动量的传递导致光动力，而角动量的传递则导致光力矩。包括辐射压力和梯度力在内的光学力长期以来被用于光镊和激光冷却。在纳米光子器件中，光学力可以显著增强，从而在经典和量子机制中产生前所未有的光学机械效应。相反，到目前为止，光的角动量和光矩效应在集成光子学中仍未被探索。在这里，我们演示了在双折射波导中传播的光子的自旋角动量的测量和使用的光转矩致动的光学机械设备的旋转运动。我们表明，的符号和大小的光扭矩是由光子偏振态，在芯片上合成。我们的研究揭示了光子偏振自由度的力学效应，并证明了它在集成光子器件中的控制。利用光矩和与光子角动量的光机械相互作用可以导致扭转腔光力学和光机械光子自旋轨道耦合，以及诸如光机械陀螺仪和扭转磁力测量的应用。

Phase-dependent light-induced torque

Optical torque on individual atoms in a Bose-Einstein condensate can rotate the ensemble and generate a current flow [Phys. Rev. A 82, 051402 (2010)]. We exploit the fact to suggest a new mechanism for enhanced and well-controlled rotational motions and show how atoms, interacting with Laguerre-Gaussian beams, experience a torque whose features depend on relative phase of applied fields so that zero and large positive, or even negative, values for the torque can be obtained. Such controllable torque, along with simplicity of tuning the relative phase, can simplify a possible implementation of …

椭圆光声谐振腔中偏振控制的布里渊散射

Polarization-controlled Brillouin scattering in elliptical optophononic resonators

研究椭圆光声微柱谐振腔中基于偏振的滤波技术，通过优化激光偏振态与微柱椭圆度实现近乎无背景的布里渊散射检测，推动纳米结构高效检测在光机械与量子通信领域的应用。

Negative optical torque on a microsphere in optical tweezers

We show that the optical force field in optical tweezers with elliptically polarized beams has the opposite handedness for a wide range of particle sizes and for the most common configurations. Our method is based on the direct observation of the particle equilibrium position under the effect of a transverse Stokes drag force, and its rotation around the optical axis by the mechanical effect of the optical torque. We find overall agreement with theory, with no fitting, provided that astigmatism, which is characterized separately, is included in the theoretical description. Our work opens the w…

椭圆量子光涡旋的Wigner分布

Wigner Distribution of Elliptical Quantum Optical Vortex

计算了双模压缩相干态耦合产生的椭圆光束中量子椭圆涡旋的Wigner准概率分布函数。通过使用分束器（BS）或双通道定向耦合器（DCDC）来执行两个模式之间的耦合。由于两个模之间的耦合而产生的量子干涉为量子计算和量子层析成像提供了控制纠缠的可能。