光的拓扑诱导手征性对拉曼散射的系统控制
Systematic control of Raman scattering with topologically induced chirality of light
摘要：
众所周知，斯托克斯拉曼散射是一种特别强大的非线性，几乎发生在每种材料中，光谱由材料定义，强度取决于材料和光强度。这种普遍性使其成为光谱学中不可或缺的工具，但在一些应用中也成为噪声或寄生发射的顽固来源。在这里，我们表明，轨道角动量携带的光束经历自旋轨道相互作用，可以从根本上改变拉曼散射的选择规则。这使得能够简单地通过控制光的拓扑电荷来定制其光谱形状（超过给定材料中的拉曼位移的一半）以及强度（大约100倍），这是在期望调制拉曼散射的众多应用中的实用能力。
英文摘要：
Stokes Raman scattering is known to be a particularly robust nonlinearity, occurring in virtually every material, with spectra defined by the material and strengths dependent on the material as well as light intensities. This ubiquity has made it an indispensable tool in spectroscopy, but also presents itself as a stubborn source of noise or parasitic emission in several applications. Here, we show that orbital angular momentum carrying light beams experiencing spin-orbit interactions can fundamentally alter the selection rules for Raman scattering. This enables tailoring its spectral shape (by over half the Raman shift in a given material) as well as strength (by about 100 times) simply by controlling the topological charge of light, which is a capability of utility across the multitude of applications where modulating Raman scattering is desired.
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