Study on Optical Force Characteristics of Triangular Metal Nanoparticles

被引：0

作者：

Wang X. ^{[1
,2
,3
]}

Jiang G. ^{[1
]}

Dong Y. ^{[1
]}

Liu S. ^{[1
]}

Gong L. ^{[4
]}

Zhao J. ^{[1
]}

Zhu Z. ^{[5
]}

Gu B. ^{[6
,7
]}

机构：

[1] Institute of Modern Optics, School of Electronic Information and Optical Engineering, Nankai University, Tianjin

[2] Tianjin Key Laboratory of Micro-scale Optical Information Technology Science, Tianjin

[3] Tianjin Key Laboratory of Photoelectric Sensors and Sensor Network Technology, Tianjin

[4] School of Mathematics, Physics and Statistics, Shanghai University of Engineering Science, Shanghai

[5] School of Computer and Electronic Information, Nanjing Normal University, Nanjing

[6] Advanced Photonics Center, Southeast University, Nanjing

[7] China Collaborative Innovation Center of Light Manipulations and Applications, Shandong Normal University, Jinan

来源：

Guangzi Xuebao/Acta Photonica Sinica | 2021年 / 50卷 / 06期

基金：

中国国家自然科学基金;

关键词：

Optical force; Optical tweezers; Radially polarized beam; Tightly focusing; Triangular gold nano-particles;

D O I：

10.3788/gzxb20215006.0614002

中图分类号：

学科分类号：

摘要：

Based on Maxwell's stress tensor theory, the photodynamic properties of polygonal gold nanoparticles in a focused field were studied. Taking triangular gold nanoparticles as an example, the trapping characteristics of triangular gold nanoparticles in focusing field with circular symmetric energy distribution and with triangular energy distribution were studied respectively from the stress conditions of the particles in the focusing field. The results show that the triangular gold nanoparticles with side length of 50~350 nm can be stably captured by using the circular symmetric focusing field. When the triangular focusing field is used, the triangular gold nanoparticles with side length of 100~350 nm can be stably captured under the condition that the particles enter the focusing field at an angle matching the shape of the focusing field. The trapping properties of triangular gold nanoparticles were compared between the circular symmetric focusing field and the triangular focusing field, and we found that the trapping force of the triangular focusing field in the x direction was stronger than that of the circular symmetric focusing field. In the y direction, the capturing range of the triangular focusing field is larger than that of the circular symmetric focusing field. In this work, we studied the optical trapping properties of triangular metal nanoparticles in different focused fields, and laid a theoretical foundation for the application of optical manipulation based on non-spherical metal particles in Raman super-resolution imaging, particle micro-processing and other fields. © 2021, Science Press. All right reserved.

引用

共 27 条

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