Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/145488
Title: Optical forces in coupled chiral particles
Authors: Wo, Kah Jen
Peng, Jie
Prasad, Madhava Krishna
Shi, Yuzhi
Li, Jensen
Wang, Shubo
Keywords: Science::Physics::Optics and light
Issue Date: 2020
Source: Wo, K. J., Peng, J., Prasad, M. K., Shi, Y., Li, J., & Wang, S. (2020). Optical forces in coupled chiral particles. Physical Review A, 102(4), 043526-. doi:10.1103/PhysRevA.102.043526
Journal: Physical Review A
Abstract: Structural chirality can induce counter-intuitive optical forces due to inherent symmetry properties. While optical forces on a single chiral particle in the Rayleigh regime have been well studied, optical forces in coupled chiral particles remain less explored. By using full-wave numerical simulations and analytical methods of source representation and coupled mode theory, we investigated the optical forces induced by a plane wave on two chiral particles coupling with each other via the evanescent near fields. We found that the induced electric and magnetic dipoles of the chiral particles have complicated couplings that give rise to dark and bright modes. The interaction force between the particles can be either attractive or repulsive, and its magnitude can be significantly enhanced by the resonance modes. The attractive force is much stronger if two particles are of opposite handedness compared with the case of same handedness. The electric dipole force and the magnetic dipole force have the same sign for two particles with the same handedness, while they are of different signs for two particles with opposite handedness. The results an lead to a better understanding of chirality-induced optical forces with potential applications in optical manipulations and chiral light-matter interactions.
URI: https://hdl.handle.net/10356/145488
ISSN: 2469-9926
DOI: 10.1103/PhysRevA.102.043526
Schools: School of Electrical and Electronic Engineering 
Rights: © 2020 American Physical Society. All rights reserved. This paper was published in Physical Review A and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:EEE Journal Articles

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