AI 中文总结
研究利用光镊捕获涂覆二氧化钛纳米粒子的二氧化硅球体，观察到不同轨道动力学。无序涂层产生手性几何结构增强光学力。基于米氏-德拜形式主义的模型解释结果并表征巴斯德参数，证明手性光学力，确定全介电粒子为定制手性光学力的材料平台。
AI 中文摘要
我们用拉盖尔-高斯模式的光镊捕获涂覆有随机分布二氧化钛纳米粒子的亚微观二氧化硅球体，并观察到与非手性二氧化硅球体不同的轨道动力学。我们表明无序的纳米粒子涂层产生有效的手性几何结构，增强对映选择性手性光学力并使轨道周期有可测量的改变。基于米氏-德拜形式主义并包括光学像差的理论模型，不仅定量解释了实验结果，还能表征量化单个复合粒子手性光学响应的巴斯德参数。这些发现构成了结构化光束对单个手性粒子施加手性光学力的直接实验证据，并确定无序驱动的全介电粒子是在纳米尺度定制手性光学力的通用材料平台。
英文摘要
We trap submicroscopic silica spheres coated with randomly distributed titanium dioxide nanoparticles in optical tweezers with Laguerre-Gaussian modes and observe orbital dynamics that differ from those of achiral silica spheres. We show that the disordered nanoparticle coating generates an effective chiral geometry, giving rise to enhanced enantioselective chiral optical forces and a measurable modification of the orbital period. A theoretical model based on the Mie-Debye formalism, including optical aberrations, not only quantitatively explains the experimental results but also allows to characterize the Pasteur parameter quantifying the chiroptical response of individual composite particles. These findings constitute direct experimental evidence of chiral optical forces exerted by structured light beams on individual chiral particles and identify disorder-enabled, all-dielectric particles as a versatile material platform to tailor chiral optical forces at the nanoscale.
