Transverse optical binding for a dual dipolar dielectric nanoparticle dimer

Xiao Yong Duan, Graham D. Bruce, Kishan Dholakia, Zhi Guo Wang, Feng Li, Ya Ping Yang

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)


The physical origins of the transverse optical binding force and torque beyond the Rayleigh approximation have not been clearly expressed to date. Here, we present analytical expressions of the force and torque for a dual dipolar dielectric dimer illuminated by a plane wave propagating perpendicularly to the dimer axis. Using this analytical model, we explore the roles of the hybridized electric dipolar, magnetic dipolar, and electric-magnetic dipolar coupling interactions in the total force and torque on the particles. We find significant departures from the predictions of the Rayleigh approximation, particularly for high-refractive-index particles, where the force is governed by the magnetic interaction. This results in an enhancement of the dimer stability by one to four orders of magnitude compared to the predictions of the Rayleigh approximation. For the case of torque, this is dominated by the coupling interaction and increases by an order of magnitude. Our results will help to guide future experimental work in optical binding of high-refractive-index dielectric particles.

Original languageEnglish
Article number013721
JournalPhysical Review A
Issue number1
Publication statusPublished - 2021 Jan

Bibliographical note

Publisher Copyright:
© 2021 American Physical Society.

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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