Optical Trapping Separation of Chiral Nanoparticles by Subwavelength Slot Waveguides,Physical Review Letters

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Optical Trapping Separation of Chiral Nanoparticles by Subwavelength Slot Waveguides
Physical Review Letters ( IF 8.1 ) Pub Date : 2021-12-01 , DOI: 10.1103/physrevlett.127.233902
Liang Fang ₁ , Jian Wang ₁

Affiliation

Enantiomer separation opens great opportunities to develop the technologies of pharmaceutics, chemicals, and biomedicine, but faces daunting challenges. Here, we discover a considerable chiral-dependent trapping force to separate nanometer-scale enantiomers in a new silicon-based waveguide platform. The electromagnetic chirality gradient of strongly confined evanescent fields can be largely enhanced by the counterpropagating slot waveguides so that the resulting chiral gradient forces can shift the trapping equilibrium positions of dielectric gradient forces. Especially, there exists a transitional width for the slot waveguides to exchange the trapping equilibrium positions between two opposite enantiomers. Our thoroughly numerical investigations demonstrate that the chiral-separable slot waveguides here can offer high efficiency and feasibility of separating chiral nanoparticles, and may pave a route toward new on-chip chiral optical tweezers or optofluidic transport systems for large-scale chiral separation.

中文翻译：

亚波长狭缝波导对手性纳米粒子的光捕获分离

对映异构体分离为制药、化学品和生物医学技术的发展提供了巨大的机遇，但也面临着艰巨的挑战。在这里，我们发现了相当大的手性依赖性俘获力，可以在新的硅基波导平台中分离纳米级对映异构体。反向传播的狭缝波导可以大大增强强限制渐逝场的电磁手性梯度，从而产生的手性梯度力可以移动介电梯度力的捕获平衡位置。特别是，缝隙波导存在过渡宽度以交换两个相反对映体之间的捕获平衡位置。

更新日期：2021-12-01

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