Influence of off-focus and off-axis distances on trapping of a Rayleigh particle

Yaoju Zhang, Guohua Zhao, Rongkun Chen and Bingnan Pei
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Yaoju Zhang: School of Electronic and Communication Engineering, Quanzhou University of Information Engineering, Quanzhou 362000, P. R. China
Guohua Zhao: School of Electronic and Communication Engineering, Quanzhou University of Information Engineering, Quanzhou 362000, P. R. China
Rongkun Chen: School of Electronic and Communication Engineering, Quanzhou University of Information Engineering, Quanzhou 362000, P. R. China
Bingnan Pei: School of Electronic and Communication Engineering, Quanzhou University of Information Engineering, Quanzhou 362000, P. R. China

International Journal of Modern Physics C (IJMPC), 2024, vol. 35, issue 03, 1-9

Abstract: The influence of the off-focus and off-axis distances on trapping of a metallic particle is investigated theoretically using vector diffraction and dipole approximation. Numerical results show that when the off-focus and off-axis distances of a metallic Rayleigh particle are smaller, typically smaller than 0.5λ, the particle can be three-dimensionally trapped to the focus by a highly focused real radially polarized beam. However, when the off-focus and off-axis distances are large, the particle can not be three-dimensionally trapped to the focus but it may be trapped to an annular region. The dependence of the trapping stability and trapping stiffness on the off-focus and off-axis distances are calculated. The effect of the beam parameter (the ratio of the radius of the lens to the beam waist) of the radially polarized light on optical trap is discussed.

Keywords: Off-focus and off-axis optical trap; Rayleigh scattering; vector diffraction (search for similar items in EconPapers)
Date: 2024
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DOI: 10.1142/S0129183124500335

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