Optical Pulling Force in Non-Paraxial Bessel Tractor Beam Generated with Polarization-Insensitive Metasurface  

作　　者：沈哲 黄昕宇 Zhe Shen;Xin-Yu Huang(School of Electronic and Optical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]School of Electronic and Optical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China

出　　处：《Chinese Physics Letters》2023年第5期25-32,共8页中国物理快报（英文版）

基　　金：the National Natural Science Foundation of China(Grant Nos.61805119 and 62275122);the Natural Science Foundation of Jiangsu Province(Grant Nos.BK20180469 and BK20180468);the Fundamental Research Funds for the Central Universities(Grant No.30919011275)。

摘　　要：Tractor beams,able to produce optical pulling forces(OPFs)on particles,are attracting increasing attention.Here,non-paraxial Bessel tractor beams are generated using polarization-insensitive metasurfaces.OPFs are found to exert on dielectric particles with specific radii at the axes of the beams.The strengths of the OPFs depend on the radii of the particles,which provides the possibility of sorting particles with different sizes.For the OPFs,the radius ranges of particles vary with the polarization states or topological charges of the incident beams.The change of polarizations can provide a switch between the pulling and pushing forces,which offers a new way to realize dynamic manipulation of particles.The change of topological charges leads to disjoint radii ranges for the OPFs exerting on particles,which provides the possibility of selective optical separation.Moreover,we study the behaviors of particles in the tractor beams.The simulation results reveal that linearly or circularly polarized tractor beams can pull particles a sufficient distance towards the light source,which verifies the feasibility of separating particles.

关 键 词：attracting SEPARATING FORCES 

分 类 号：O43[机械工程—光学工程]