Harnessing linear and angular momenta of light is one of the cornerstones in modern optics and has found tremendous applications in optical circuits, particle manipulation, metrology, quantum information processing, etc. Emerging theoretical protocols and experimental explorations have created a surge of interest in light lateral momenta and forces, which are perpendicular to the light wave propagation direction. However, there is yet a lack of a comprehensive and holistic overview of transverse momenta (both linear and angular) as well as of optical lateral forces (OLFs). In this article, we first review the most recent transverse momenta including the transverse spin angular momentum, optical skyrmions, as well as lateral momenta from directional side scattering, spin–orbit interaction, and surface plasmon polaritons. Since optical forces result from the momentum exchange between light and matter, the transverse momentum consequently gives rise to intriguing OLFs, which is the second topic of this article. Additional non-trivial lateral forces that combine optics with other effects from thermodynamics, electricity, and microfluidics, are also discussed. It should be emphasized that these momenta and forces ubiquitously exist in a broad range of optical phenomena and have often been neglected due to their unpredicted underlying physics and shortage of experimental means, especially prior to the last decade.

中文翻译：

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光横向动量和光学横向力的进展

利用光的线性和角动量是现代光学的基石之一，并在光学电路、粒子操纵、计量学、量子信息处理等领域找到了巨大的应用。新兴的理论协议和实验探索引起了人们对光横向的兴趣激增动量和力，垂直于光波传播方向。然而，目前还缺乏对横向动量（线性和角度）以及光学横向力（OLF）的全面和整体的概述。在本文中，我们首先回顾了最新的横向动量，包括横向自旋角动量、光学斯格明子，以及来自定向侧散射、自旋轨道相互作用和表面等离子体激元的横向动量。由于光学力是由光与物质之间的动量交换产生的，因此横向动量会产生有趣的 OLF，这是本文的第二个主题。还讨论了将光学与热力学、电学和微流体的其他效应相结合的额外的重要横向力。应该强调的是，这些动量和力普遍存在于广泛的光学现象中，但由于其不可预测的基础物理和实验手段的缺乏，特别是在过去十年之前，常常被忽视。还讨论了将光学与热力学、电学和微流体的其他效应相结合的额外的重要横向力。应该强调的是，这些动量和力普遍存在于广泛的光学现象中，但由于其不可预测的基础物理和实验手段的缺乏，特别是在过去十年之前，常常被忽视。还讨论了将光学与热力学、电学和微流体的其他效应相结合的额外的重要横向力。应该强调的是，这些动量和力普遍存在于广泛的光学现象中，但由于其不可预测的基础物理和实验手段的缺乏，特别是在过去十年之前，常常被忽视。