Abstract

An efficient method for the calculation of the optical force of a single nanoparticle is proposed based on the expansion of quasinormal modes (QNMs), which are eigensolutions of source-free Maxwell’s equations with complex eigenfrequencies. In this method, the optical force is calculated by integrating the Maxwell stress tensor (MST) over a closed surface encompassing the nanoparticle. The electromagnetic (EM) field required for evaluating the MST is computed by a rigorous modal analysis, in which the EM field is expanded onto a small set of QNMs. Once the QNMs of the nanoparticle are solved, their excitation coefficients are obtained analytically. This means that additional full-wave computations are not required if the nanoparticle’s location and the wavelength or distribution of the excitation field vary. Comparisons with full-wave numerical calculations of optical force evidence the high efficiency and accuracy of our formalism.

© 2021 Optical Society of America

Efficient method for the calculation of the optical force of multiple nanoparticles based on the coupling theory of quasinormal modes

Zhe Qi, Ying Zhong, and Haitao Liu
Opt. Lett. 46(18) 4610-4613 (2021)

Efficient method for modeling large-scale arrays of optical nanoresonators based on the coupling theory of quasinormal mode

Qiyong Tao, Yuhang Su, Can Tao, Ying Zhong, and Haitao Liu
Opt. Express 32(5) 7171-7184 (2024)

Quasinormal modes expansions for nanoresonators made of absorbing dielectric materials: study of the role of static modes

Christophe Sauvan
Opt. Express 29(6) 8268-8282 (2021)

Enantioselection and chiral sorting of single microspheres using optical pulling forces

Rfaqat Ali, R. S. Dutra, F. A. Pinheiro, and P. A. Maia Neto
Opt. Lett. 46(7) 1640-1643 (2021)

Normalization, orthogonality, and completeness of quasinormal modes of open systems: the case of electromagnetism [Invited]

Christophe Sauvan, Tong Wu, Rachid Zarouf, Egor A. Muljarov, and Philippe Lalanne
Opt. Express 30(5) 6846-6885 (2022)