Chirality-assisted lateral momentum transfer for bidirectional enantioselective separation

Author:

Shi YuzhiORCID,Zhu Tongtong,Zhang Tianhang,Mazzulla AlfredoORCID,Tsai Din PingORCID,Ding WeiqiangORCID,Liu Ai QunORCID,Cipparrone Gabriella,Sáenz Juan José,Qiu Cheng-WeiORCID

Abstract

AbstractLateral optical forces induced by linearly polarized laser beams have been predicted to deflect dipolar particles with opposite chiralities toward opposite transversal directions. These “chirality-dependent” forces can offer new possibilities for passive all-optical enantioselective sorting of chiral particles, which is essential to the nanoscience and drug industries. However, previous chiral sorting experiments focused on large particles with diameters in the geometrical-optics regime. Here, we demonstrate, for the first time, the robust sorting of Mie (size ~ wavelength) chiral particles with different handedness at an air–water interface using optical lateral forces induced by a single linearly polarized laser beam. The nontrivial physical interactions underlying these chirality-dependent forces distinctly differ from those predicted for dipolar or geometrical-optics particles. The lateral forces emerge from a complex interplay between the light polarization, lateral momentum enhancement, and out-of-plane light refraction at the particle-water interface. The sign of the lateral force could be reversed by changing the particle size, incident angle, and polarization of the obliquely incident light.

Funder

Ministry of Education - Singapore

National Research Foundation Singapore

Fundamental Research Funds for the Central Universities (DUT19R

Publisher

Springer Science and Business Media LLC

Subject

Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials

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