光学学报, 2019, 39 (7): 0714003, 网络出版: 2019-07-16  

基于非正交二元相位板的多焦点阵列光镊 下载: 1260次

Multifocal Array Optical Tweezers Using Non-Orthogonal Binary Phase Plate
作者单位
1 鲁东大学物理与光电工程学院, 山东 烟台 264025
2 鲁东大学交通学院, 山东 烟台 264025
摘要
提出了一种基于非正交二元相位板的阵列光镊系统,此系统可以实现对非正交排列的多个粒子的稳定捕获。通过对高数值孔径物镜在紧聚焦条件下的傅里叶变换理论和遗传算法来设计二元相位,优化得到具有不同分束比的,具有高衍射效率、高均匀度的归一化相位转折点,进而根据相位转折点设计出具有不同倾斜角度的非正交二元相位板。利用此二元相位板可以获得高数值孔径物镜聚焦下的各种非正交分布的阵列光斑。利用此类非正交阵列光斑,在光镊实验中实现了对二氧化硅微球的稳定捕获。理论模拟与实验结果表明,此方法可以实现对非正交排列的大量粒子的稳定捕获,在纳米粒子阵列的外延生长领域有着良好的应用前景。
Abstract
In this work, an array optical tweezer system based on non-orthogonal binary phase plates is proposed. The proposed system can stably trap multiple particles arranged in a non-orthogonal array. The binary phase is designed through a genetic algorithm and the Fourier transform theory of a high numerical aperture (NA) objective lens under tight focusing conditions. The normalized phase turning point of the binary phase is optimized to have different beam-splitting ratios, high diffraction efficiency, and high uniformity, and then it can be used to design the non-orthogonal binary phase plate with different inclination angles. Using this binary phase plate, we can obtain a variety of non-orthogonal array spots in the focal plane of the high-NA objective lens. Furthermore, the stable trapping of silica microspheres can be realized in the experiment of optical tweezers based on the non-orthogonal array spots. Theoretical simulation and experimental results show that this method can effectively achieve the optical trapping of a non-orthogonal arrangement of a large number of particles. This technology is expected to play an essential role in the epitaxial growth of nanoparticle arrays.

孙丰钰, 陈苗, 梁宇, 宋翰林, 王天屹, 刘忠凯, 孙美玉, 朱林伟. 基于非正交二元相位板的多焦点阵列光镊[J]. 光学学报, 2019, 39(7): 0714003. Fengyu Sun, Miao Chen, Yu Liang, Hanlin Song, Tianyi Wang, Zhongkai Liu, Meiyu Sun, Linwei Zhu. Multifocal Array Optical Tweezers Using Non-Orthogonal Binary Phase Plate[J]. Acta Optica Sinica, 2019, 39(7): 0714003.

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