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Nanoscopic control and quantification of enantioselective optical forces
Nature Nanotechnology ( IF 38.1 ) Pub Date : 2017-09-25 , DOI: 10.1038/nnano.2017.180
Yang Zhao 1 , Amr A E Saleh 1, 2 , Marie Anne van de Haar 3 , Brian Baum 1 , Justin A Briggs 4 , Alice Lay 4 , Olivia A Reyes-Becerra 1 , Jennifer A Dionne 1
Affiliation  

Circularly polarized light (CPL) exerts a force of different magnitude on left- and right-handed enantiomers, an effect that could be exploited for chiral resolution of chemical compounds1,2,3,4,5 as well as controlled assembly of chiral nanostructures6,7. However, enantioselective optical forces are challenging to control and quantify because their magnitude is extremely small (sub-piconewton) and varies in space with sub-micrometre resolution2. Here, we report a technique to both strengthen and visualize these forces, using a chiral atomic force microscope probe coupled to a plasmonic optical tweezer8,9,10,11,12,13. Illumination of the plasmonic tweezer with CPL exerts a force on the microscope tip that depends on the handedness of the light and the tip. In particular, for a left-handed chiral tip, transverse forces are attractive with left-CPL and repulsive with right-CPL. Additionally, total force differences between opposite-handed specimens exceed 10 pN. The microscope tip can map chiral forces with 2 nm lateral resolution, revealing a distinct spatial distribution of forces for each handedness.



中文翻译:

对映选择性光学力的纳米级控制和量化

圆偏振光 (CPL) 对左手和右手对映异构体施加不同大小的力,这种效应可用于化合物1、2、3、4、5的手性拆分以及手性纳米结构的受控组装6,7。然而,对映选择性光学力难以控制和量化,因为它们的量级非常小(亚皮牛顿),并且在空间中以亚微米分辨率2变化。在这里,我们报告了一种增强和可视化这些力的技术,使用与等离子体光学镊子耦合的手性原子力显微镜探针8,9,10,11,12,13. 用 CPL 照明等离子镊子会对显微镜尖端施加一个力,这取决于光和尖端的手性。特别是,对于左手手征尖端,横向力对左 CPL 有吸引力,而对右 CPL 排斥。此外,反手试样之间的总力差超过 10 pN。显微镜尖端可以绘制具有 2 nm 横向分辨率的手性力,揭示每个手性的不同空间分布。

更新日期:2017-09-25
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