Sensitive vectorial optomechanical footprint of light in soft condensed matter
Sensitive vectorial optomechanical footprint of light in soft condensed matter
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DOI：
10.1038/s41566-020-00726-2
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发表时间：
2020-12-07
期刊：
影响因子：
35
通讯作者：
Brasselet, Etienne
中科院分区：
文献类型：
--
作者：
El Ketara, Mohamed;Kobayashi, Hirokazu;Brasselet, Etienne
在决定其机械效应的光的性质中，自对光子自旋的机械识别以来，偏振一直占有特殊的地位(1)。如今，线偏振弱聚焦(近轴)光束在透明和均匀介质上的机械作用可能并不令人惊讶。尽管如此，我们在这里揭示了由材料各向异性和真实世界光束固有的纵场分量所介导的矢量光机械效应(2，3)。在实验上，利用一种容易表现出敏感和可逆效应的弹性各向异性介质，即向列相液晶，证明了这一点，并将我们的结果推广到矢量束。这代表了一种不可逆的破坏性方法的替代方案，该方法仅限于强烈的非近轴场(5)。据报道，从一束光束产生多个自感应透镜也开辟了拓扑辅助的全光信息路由策略。此外，我们的发现指出，横向内部光能流(自旋和轨道)(6)是定制结构光学非线性的新的触发因素。
Among the properties of light that dictate its mechanical effects, polarization has held a special place since the mechanical identification of the photon spin(1). Nowadays, little surprise might be expected from the mechanical action of linearly polarized weakly focused (paraxial) beams on transparent and homogeneous dielectrics. Still, here we unveil vectorial optomechanical effects mediated by the material anisotropy and the longitudinal field component inherent to real-world beams(2,3). Experimentally, this is demonstrated by using an elastic anisotropic medium prone to exhibit a sensitive and reversible effect, that is, a nematic liquid crystal, and our results are generalized to vector beams(4). This represents an alternative to irreversible damaging approaches restricted to strongly non-paraxial fields(5). The reported creation of multiple self-induced lenses from a single beam also open up topology assisted all-optical information routing strategies. Moreover, our findings point out the transverse internal optical energy flows (spin and orbital)(6) as novel triggers to tailor structured optical nonlinearities.