Optomechanical effects caused by non-zero field quantities in multiple evanescent waves

Li，Yaxin1; Yu，Xinning2,3; Qu，Tiantao1; Ng，Jack4; Lin，Zhifang3,5; Zhang，Lei6,7; Chen，Jun1,7

2023-12-18

10.1364/OE.506758

Optics Express   影响因子和分区

1094-4087

Evanescent waves, with their high energy density, intricate local momentum, and spatial distribution of spins, have been the subject of extensive recent study. These waves offer promising applications in near-field particle manipulation. Consequently, it becomes imperative to gain a deeper understanding of the impacts of scattering and gradient forces on particles in evanescent waves to enhance and refine the manipulation capabilities. In this study, we employ the multipole expansion theory to present analytical expressions for the scattering and gradient forces exerted on an isotropic sphere of any size and composition in multiple evanescent waves. The investigation of these forces reveals several unusual optomechanical phenomena. It is well known that the scattering force does not exist in counter-propagating homogeneous plane waves. Surprisingly, in multiple pairs of counter-propagating evanescent waves, the scattering force can arise due to the nonzero orbital momentum (OM) density and/or the curl part of the imaginary Poynting momentum (IPM) density. More importantly, it is found that the optical scattering force can be switched on and off by simply tuning the polarization. Furthermore, optical forces typically vary with spatial position in an interference field. However, in the interference field generated by evanescent waves, the gradient force becomes a spatial constant in the propagating plane as the particle’s radius increases. This is attributed to the decisive role of the non-interference term of the electromagnetic energy density gradient. Our study establishes a comprehensive and rigorous theoretical foundation, propelling the advancement and optimization of optical manipulation techniques harnessed through multiple evanescent waves. Specifically, these insights hold promise in elevating trapping efficiency through precise control and manipulation of optical scattering and gradient forces, stimulating further explorations.

SCI

英语

其他

PHYSICS

2-s2.0-85180267067

Scopus

1.State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Theoretical Physics,Shanxi University,Taiyuan,030006,China
2.School of Science,Zhejiang University of Science and Technology,Hangzhou,310023,China
3.State Key Laboratory of Surface Physics (SKLSP),Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education),Department of Physics,Fudan University,Shanghai,200433,China
4.Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China
5.Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing,210093,China
6.State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Laser Spectroscopy,Shanxi University,Taiyuan,030006,China
7.Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan,030006,China

Li，Yaxin,Yu，Xinning,Qu，Tiantao,et al. Optomechanical effects caused by non-zero field quantities in multiple evanescent waves[J]. Optics Express,2023,31(26):44004-44018.

Li，Yaxin.,Yu，Xinning.,Qu，Tiantao.,Ng，Jack.,Lin，Zhifang.,...&Chen，Jun.(2023).Optomechanical effects caused by non-zero field quantities in multiple evanescent waves.Optics Express,31(26),44004-44018.

Li，Yaxin,et al."Optomechanical effects caused by non-zero field quantities in multiple evanescent waves".Optics Express 31.26(2023):44004-44018.