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Title: Chirality-assisted lateral momentum transfer for bidirectional enantioselective separation
Authors: Shi, Y.
Zhu, T.
Zhang, T. 
Mazzulla, A.
Tsai, D.P.
Ding, W.
Liu, A.Q.
Cipparrone, G.
Sáenz, J.J.
Qiu, C.-W. 
Issue Date: 2020
Publisher: Springer Nature
Citation: Shi, Y., Zhu, T., Zhang, T., Mazzulla, A., Tsai, D.P., Ding, W., Liu, A.Q., Cipparrone, G., Sáenz, J.J., Qiu, C.-W. (2020). Chirality-assisted lateral momentum transfer for bidirectional enantioselective separation. Light: Science and Applications 9 (1) : 62. ScholarBank@NUS Repository.
Rights: Attribution 4.0 International
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. © 2020, The Author(s).
Source Title: Light: Science and Applications
ISSN: 2095-5545
DOI: 10.1038/s41377-020-0293-0
Rights: Attribution 4.0 International
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