Orientation of crossing mode micro cylinders in linearly polarized optical tweezers

Yuhua Yang; Yunlong Sheng

doi:10.1117/12.2607123

24 November 2021 Orientation of crossing mode micro cylinders in linearly polarized optical tweezers

Yuhua Yang, Yunlong Sheng

Proceedings Volume 12062, AOPC 2021: Optoelectronics and Nanophotonics; 120620V (2021) https://doi.org/10.1117/12.2607123
Event: Applied Optics and Photonics China 2021, 2021, Beijing, China

Abstract

In the novel application of light torques, we determined and characterized the orienting torque acting on micron-size crossing shape cylinders by the irradiance of a linearly polarized laser. The dielectric and gold materials commonly employed for the particles. The theoretical model is based on the Lorenz-Mie method, by three-dimensional (3D) finite elements analysis (using Radio Frequency Module in COMSOL) calculating the Maxwell stress tensor (MST). To understand the different mechanisms of optical manipulation, the gradient force, scattering force, total force in the x, y and z directions and the trapping potential U are also described and explained. Numerical results show that the optical torque spectrum is in accordance with shape, size and material of the particle. In doing so, we demonstrate how crossing shape cylinders outperform single cylinder and offer unprecedented opportunities to expand the control of optical force and torque at the (sub) micron-scale, as a rotating micron/nanomotor for a variety of applications in nanoscience, biophysics and engineering.

Citation Download Citation

Yuhua Yang and Yunlong Sheng "Orientation of crossing mode micro cylinders in linearly polarized optical tweezers", Proc. SPIE 12062, AOPC 2021: Optoelectronics and Nanophotonics, 120620V (24 November 2021); https://doi.org/10.1117/12.2607123

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