arXiv 1906.025282019-06physics.optics

光镊对手性纳米粒子的不对称操作

Enantioselective manipulation of chiral nanoparticles using optical tweezers

R. Ali, F. A. Pinheiro, F. S. S. Rosa, R. S. Dutra, P. A. Maia Neto

备注：: 10 pages, 4 figures

摘要：

提出了一种利用光镊对手性纳米粒子进行手性拆分的方法。我们证明，在一个典型的，现实的光学镊子设置与圆偏振捕获光束的光学捕获力是敏感的核壳纳米粒子的手性，允许有效的对映选择。结果表明，通过选择合适的捕获光束的圆偏振，可以选择被捕获粒子的旋向性。每个单独的被捕获的纳米颗粒的手性可以通过测量在横向斯托克斯拖曳力的作用下平衡位置的旋转来表征。我们表明，壳的手征性引起额外的扭曲，导致强烈的增强的光学扭矩驱动的旋转。这两种方法被证明是强大的对尺寸和材料参数的变化，表明它们是特别有用的（但不限于）在手性等离子体中的实际利益的几种情况下，其中对映体选择和表征的单个手性纳米粒子，每一个都具有其独特的手性和光学性质，是为了。特别是，我们的方法可以用来揭示由单个等离子体激元树莓中的无序引起的手性响应，该等离子体激元树莓是通过在电介质核心周围紧密堆积大量金属纳米球而合成的。

英文摘要：

We put forward an enantioselective method for chiral nanoparticles using optical tweezers. We demonstrate that the optical trapping force in a typical, realistic optical tweezing setup with circularly-polarized trapping beams is sensitive to the chirality of core-shell nanoparticles, allowing for efficient enantioselection. It turns out that the handedness of the trapped particles can be selected by choosing the appropriate circular polarization of the trapping beam. The chirality of each individual trapped nanoparticle can be characterized by measuring the rotation of the equilibrium position under the effect of a transverse Stokes drag force. We show that the chirality of the shell gives rise to an additional twist, leading to a strong enhancement of the optical torque driving the rotation. Both methods are shown to be robust against variations of size and material parameters, demonstrating that they are particularly useful in (but not restricted to) several situations of practical interest in chiral plasmonics, where enantioselection and characterization of single chiral nanoparticles, each and every with its unique handedness and optical properties, are in order. In particular, our method could be employed to unveil the chiral response arising from disorder in individual plasmonic raspberries, synthesized by close-packing a large number of metallic nanospheres around a dielectric core.

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英文摘要：

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