Manipulation force analysis of nanoparticles with ultra-high numerical aperture metalens

Author:

Wang Yan12,Peng Miao2,Cheng Wei12,Peng Zheng12,Cheng Hao1,Ren Xiaodong1,Zang Shengyin1,Shuai Yubei1,Liu Hao1,Wu Jiagui1ORCID,Yang Junbo2

Affiliation:

1. Southwest University

2. National University of Defense Technology

Abstract

Metalens optical tweezers technology has several advantages for manipulating micro-nano particles and high integration. Here, we used particle swarm optimization (PSO) to design a novel metalens tweezer, which can get 3-dimensional trapping of particles. The numerical aperture (NA) of the metalens can reach 0.97 and the average focusing efficiency is 44%. Subsequently, we analyzed the optical force characteristics of SiO2 particles with a radius of 350 nm at the focal point of the achromatic metalens. We found the average maximum force of SiO2 particles in the x-direction and z-direction to be 0.88 pN and 0.72 pN, respectively. Compared with the dispersive metalens, it is beneficial in maintaining the constant of optical force, the motion state of trapped particles, and the stability of the trapping position.

Funder

National Natural Science Foundation of China

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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