AI 中文总结
研究旨在验证光学手性对纳米级手性光-物质相互作用的控制。通过实现特定光场，实验验证了手性纳米粒子的响应与光学手性空间调制相关，非手性粒子无此现象，电磁模拟还证明了对映选择性光阱捕获的可行性。
AI 中文摘要
光学手性被认为是控制手性光-物质相互作用的基本量，但一直缺乏直接实验验证。本文实现了具有空间调制光学手性和近乎均匀电能密度的光场，首次直接实验验证了光学手性控制纳米级手性光-物质相互作用。单个手性纳米粒子表现出随光学手性空间调制的差异响应，非手性纳米粒子则无调制现象。电磁模拟进一步证明了通过实验可实现的手性光学力进行对映选择性光阱捕获的可行性。
英文摘要
Optical chirality has been proposed as the local electromagnetic quantity governing chiral light-matter interactions, yet in conventional circularly polarized fields its magnitude is locked to the electric energy density, obscuring its independent role. Here we create a structured optical field in which optical chirality arises spatially in magnitude and sign while the electric energy density remains nearly uniform. A single chiral nanoparticle exhibits a differential response that follows this spatial variation, whereas no modulation is observed for an achiral nanoparticle, providing direct experimental evidence that optical chirality governs nanoscale chiral light-matter interactions. Measurements of wavelength-dependent optical rotation further provide an experimental estimate of the chiral polarizability, predicting a chiral gradient force of approximately 100 fN and a one-dimensional trapping potential exceeding the thermal energy at room temperature under optimized aqueous trapping conditions.
Comments19 pages, 3 figures
