
1.School of Mechanical Engineering, Xi'an Jiaotong University, Xi'an 710049, China
2.School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore
3.Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117583, Singapore
4.School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian 116024, China
5.School of Physics, Harbin Institute of Technology, Harbin 150001, China
6.CNR-NANOTEC, LiCryL and Centre of Excellence CEMIF. CAL, Ponte P. Bucci, Cubo 33B, 87036 Rende (CS), Italy
7.Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China
8.Department of Physics, University of Calabria, Ponte P. Bucci, Cubo 33B, 87036 Rende (CS), Italy
9.Donostia International Physics Center, 20018 Donostia-San Sebastián, Spain
Cheng-Wei Qiu (chengwei.qiu@nus.edu.sg)
Published:2020,
Published Online:16 April 2020,
Received:28 January 2020,
Revised:12 March 2020,
Accepted:17 March 2020
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Shi, Y. Z. et al. Chirality-assisted lateral momentum transfer for bidirectional enantioselective separation. Light: Science & Applications, 9, 645-656 (2020).
Shi, Y. Z. et al. Chirality-assisted lateral momentum transfer for bidirectional enantioselective separation. Light: Science & Applications, 9, 645-656 (2020). DOI: 10.1038/s41377-020-0293-0.
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.
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