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Title: Chirality-assisted lateral momentum transfer for bidirectional enantioselective separation
Authors: Shi, Yuzhi
Zhu, Tongtong
Zhang, Tianhang
Mazzulla, Alfredo
Tsai, Din Ping
Ding, Weiqiang
Liu, Ai Qun
Cipparrone, Gabriella
Sáenz, Juan José
Qiu, Cheng-Wei
Keywords: Science::Physics
Issue Date: 2020
Source: Shi, Y., Zhu, T., Zhang, T., Mazzulla, A., Tsai, D. P., Ding, W., Liu, A. Q., Cipparrone, G., Sáenz, J. J. & Qiu, C. (2020). Chirality-assisted lateral momentum transfer for bidirectional enantioselective separation. Light: Science and Applications, 9(1).
Project: R-263-000-D11-114
Journal: Light: Science and Applications
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.
ISSN: 2095-5545
DOI: 10.1038/s41377-020-0293-0
Schools: School of Electrical and Electronic Engineering 
Rights: © 2020 The Author(s). This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproductionin 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
Fulltext Permission: open
Fulltext Availability: With Fulltext
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