Characterization of optical forces and torques in polystyrene spheres steered by tightly focused orbital angular momentum beams

Wenhao Miao; Li Long; Fei Zhang; Anbin Du; Tongtong Kang; Yan Chen; Lanting Li; Mingbo Pu; Xiangang Luo

doi:10.1117/12.3023688

18 March 2024 Characterization of optical forces and torques in polystyrene spheres steered by tightly focused orbital angular momentum beams

Wenhao Miao, Li Long, Fei Zhang, Anbin Du, Tongtong Kang, Yan Chen, Lanting Li, Mingbo Pu, Xiangang Luo

Author Affiliations +

Proceedings Volume 13104, Advanced Fiber Laser Conference (AFL2023); 131045O (2024) https://doi.org/10.1117/12.3023688
Event: Advanced Fiber Laser Conference (AFL2023), 2023, Shenzhen, China

Abstract

With orbital angular momentum, tightly focused vortex beams can impose optical torque on particles through momentum transfer. In this paper, based on the Richards-Wolf vector diffraction theory, we examine the forces and moments exerted on Mie particles by a tightly focused beam, including the impact of the beam's intensity distribution and the topological charge (TC) number on particle trapping stability. Numerical calculations are conducted to assess the effects of corresponding parameters on the characteristics of the optical radiation force and the tight focusing properties. Our results show that the direction of the particle’s rotation is determined by the sign of the TC numbers and that there is a direct relationship between the magnitude of the induced torque and the TCs. Furthermore, the stability of particle control can be improved by OAM beams with small TCs. These results have potential applications in light capture, optical storage, and optical imaging.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Wenhao Miao, Li Long, Fei Zhang, Anbin Du, Tongtong Kang, Yan Chen, Lanting Li, Mingbo Pu, and Xiangang Luo "Characterization of optical forces and torques in polystyrene spheres steered by tightly focused orbital angular momentum beams", Proc. SPIE 13104, Advanced Fiber Laser Conference (AFL2023), 131045O (18 March 2024); https://doi.org/10.1117/12.3023688

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available