Diffraction-limited axial double foci and optical traps generated by optimization-free planar lens

Nanophotonics

article

Long Ma¹  Peng Jin¹  Jian Guan³  Yiqun Wang¹  Chen Chen¹  Jianlong Zhang⁵  Jie Lin¹  Jiubin Tan¹ 

[1] Institute of Ultra-Precision Optoelectronic Instrument Engineering, Harbin Institute of Technology;Key Laboratory of Micro-systems and Micro-structures Manufacturing, Ministry of Education, Harbin Institute of Technology;Institute of Intelligent Optical Measurement and Detection, College of Physics and Optoelectronic Engineering, Shenzhen University;Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences;Institute of Optical Target Simulation and Testing Technology, Harbin Institute of Technology

关键词: subwavelength focusing;    double foci;    planar lens;    optical trap;    optical force;   

DOI  :  10.1515/nanoph-2019-0482

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

Axial diffraction-limited multiple foci are a kind of investigated focal field for trapping multiple nano-particles. We first experimentally generated diffraction-limited axial double foci by optimization-free binary planar lens and theoretically demonstrated it, which can be applied in multi-particle trapping. The proposed binary planar lens was analytically designed. The BPL has a numerical aperture of 0.9 and a focal length of 150 μm. The focal field of the binary planar lens, which is composed of diffraction-limited axial double foci, was first experimentally validated. The measured maximum lateral full widths at half maximum of the two generated focal spots were diffraction-limited and consistent with the theoretical. The axial double foci formed two stable optical traps that can trap two Rayleigh dielectric particles simultaneously. The radial, azimuthal and axial optical forces of the double optical traps are in good uniformity, which are 0.98, 0.99 and 0.96, respectively.

【 授权许可】

CC BY