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Rotation of an elliptical dielectric particle in the focus of a circularly polarized Gaussian beam
A.G. Nalimov 1,2, S.S. Stafeev 1,2

1 IPSI RAS – Branch of the FSRC "Crystallography and Photonics" RAS, Molodogvardeyskaya 151, 443001, Samara, Russia,
2 Samara National Research University, Moskovskoye Shosse 34, 443086, Samara, Russia

 PDF, 2208 kB

DOI: 10.18287/2412-6179-CO-693

Pages: 561-567.

Full text of article: Russian language.

Abstract:
A force and a torque exerted on an elliptical dielectric particle in the focus of a spherical circularly polarized laser beam are considered. The numerical simulation is conducted using a diffraction field obtained by an FDTD method, with the force and torque derived using a Maxwell’s stress tensor. It is shown that an optical torque is exerted on the center of an elliptical particle put in the focus of a circularly polarized spherical wave, making it rotate around the optical axis. The rotation occurs when the elliptical microparticle is situated in a transverse plane to the optical axis. When shifting the ellipsoid from the optical axis, an optical trapping force appears that prevents its displacement, meaning that the particle finds itself in an optical trap on the optical axis.

Keywords:
light force, optical torque, optical tweezers, Maxwell’s stress tensor, rotation.

Citation:
Nalimov AG, Stafeev SS. Rotation of an elliptical dielectric particle in the focus of a circularly polarized Gaussian beam. Computer Optics 2020; 44(4): 561-567. DOI: 10.18287/2412-6179-CO-693.

Acknowledgements:
The work was partly funded by the Russian Science Foundation (section “Theoretical background”), # 18-19-00595 (section “A torque in a non-vortex beam”), the Russian Foundation for Basic Research grant # 18-29-20003 (section “A force and torque in vortex beam”) and the RF Ministry of Science and Higher Education within a state contract with the FSRC “Crystallography and Photonics” RAS under agreement 007-ГЗ/Ч3363/26 (sections “Introduction” and “Conclusion”).

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