Optical forces in coupled chiral particles

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

9 Scopus Citations
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Author(s)

  • Kah Jen Wo
  • Madhava Krishna Prasad
  • Yuzhi Shi
  • Jensen Li

Detail(s)

Original languageEnglish
Article number043526
Journal / PublicationPhysical Review A
Volume102
Issue number4
Online published28 Oct 2020
Publication statusPublished - Oct 2020

Abstract

Structural chirality can induce counterintuitive 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 an analytical method of source representation, 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 the 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 can lead to a better understanding of chirality-induced optical forces with potential applications in optical manipulations and chiral light-matter interactions.

Research Area(s)

  • physics.optics

Citation Format(s)

Optical forces in coupled chiral particles. / Wo, Kah Jen; Peng, Jie; Prasad, Madhava Krishna et al.
In: Physical Review A, Vol. 102, No. 4, 043526, 10.2020.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review