Chirality-assisted lateral momentum transfer for bidirectional enantioselective separation

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Yuzhi Shi
  • Tongtong Zhu
  • Tianhang Zhang
  • Alfredo Mazzulla
  • Weiqiang Ding
  • Ai Qun Liu
  • Gabriella Cipparrone
  • Juan José Sáenz
  • Cheng-Wei Qiu

Detail(s)

Original languageEnglish
Article number62
Journal / PublicationLight: Science and Applications
Volume9
Online published16 Apr 2020
Publication statusPublished - 2020
Externally publishedYes

Link(s)

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.

Research Area(s)

Citation Format(s)

Chirality-assisted lateral momentum transfer for bidirectional enantioselective separation. / Shi, Yuzhi; Zhu, Tongtong; Zhang, Tianhang; Mazzulla, Alfredo; Tsai, Din Ping; Ding, Weiqiang; Liu, Ai Qun; Cipparrone, Gabriella; Sáenz, Juan José; Qiu, Cheng-Wei.

In: Light: Science and Applications, Vol. 9, 62, 2020.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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