First Observation of Optical Activity in Hyper-Rayleigh Scattering
First Observation of Optical Activity in Hyper-Rayleigh Scattering
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DOI：
10.1103/physrevx.9.011024
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发表时间：
2019-02-06
影响因子：
12.5
通讯作者：
Valev, V. K.
中科院分区：
文献类型：
--
作者：
Collins, J. T.;Rusimova, K. R.;Valev, V. K.
手性纳米或超材料和表面具有显著的光子特性，如负折射率和超手征光，在新型光学元件、纳米机器人和增强手性分子与光的相互作用方面具有广阔的应用前景。在手性的表征方面，尽管非线性手性技术通常比线性光学技术更敏感，但将真正的手性与各向异性分开是一个主要的挑战。在这里，我们首次观测到二次谐超瑞利散射(HRS)中的旋光性。我们在水中银纳米螺旋的三维各向同性悬浮液中演示了这种效应。这种效应比线性旋光强5个数量级，并且在多光子发光背景上表现得很明显。由于其灵敏度、各向同性的环境和简单的实验几何结构，HRS光学活性构成了包括纳米材料、超材料和化学分子在内的介质的手性光子学的根本实验突破。
Chiral nano- or metamaterials and surfaces enable striking photonicproperties, such as negative refractive index and superchiral light, driving promising applications in novel optical components, nanorobotics, and enhanced chiral molecular interactions with light. In characterizing chirality, although nonlinear chiroptical techniques are typically much more sensitive than their linear optical counterparts, separating true chirality from anisotropy is a major challenge. Here, we report the first observation of optical activity in second-harmonic hyper-Rayleigh scattering (HRS). We demonstrate the effect in a 3D isotropic suspension of Ag nanohelices in water. The effect is 5 orders of magnitude stronger than linear optical activity and is well pronounced above the multiphoton luminescence background. Because of its sensitivity, isotropic environment, and straightforward experimental geometry, HRS optical activity constitutes a fundamental experimental breakthrough in chiral photonics for media including nanomaterials, metamaterials, and chemical molecules.