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Title: Chirality-assisted lateral momentum transfer for bidirectional enantioselective separation
Authors: Shi, YZ
Zhu, TT
Zhang, TH
Mazzulla, A
Tsai, DP 
Ding, WQ
Liu, AQ
Cipparrone, G
Saenz, JJ
Qiu, CW
Issue Date: 2020
Source: Light : science & applications, 16 Apr. 2020, v. 9, 62, p. 1-12
Abstract: Lateral 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.
Publisher: Nature Publishing Group
Journal: Light : science & applications 
ISSN: 2095-5545
EISSN: 2047-7538
DOI: 10.1038/s41377-020-0293-0
Rights: © The Author(s) 2020
Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit
The following publication Shi, Y., Zhu, T., Zhang, T. et al. Chirality-assisted lateral momentum transfer for bidirectional enantioselective separation. Light Sci Appl 9, 62 (2020) is available at
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