光学镊子
光学
俘获
调制(音乐)
等离子体子
激光器
光学力
非线性系统
克尔效应
表面等离子体子
激发
材料科学
光功率
光电子学
物理
量子力学
生物
声学
生态学
作者
Wenjun Zhang,Yuquan Zhang,Shuoshuo Zhang,Yulong Wang,Yang Wu,Changjun Min,Xiaocong Yuan
出处
期刊:Optics Express
[Optica Publishing Group]
日期:2021-03-30
卷期号:29 (8): 11664-11664
被引量:3
摘要
Surface plasmon optical tweezers based on micro- and nano-structures are capable of capturing particles in a very small spatial scale and have been widely used in many front research fields. In general, distribution of optical forces and potential wells exerted on the particles can be modulated by controlling the geometric parameters of the structures. However, these fabricated structures are irreversible once processed, which greatly limits its application in dynamic manipulation. The plasmonic field in these structures can be enhanced with orders of magnitude compared to the excitation light, offering a possibility to stimulate nonlinear responses as a new degree of freedom for dynamic modulation. Here, we theoretically demonstrate that the optical force and potential well can be modulated on account of the nonlinear Kerr effect of a gold bowtie structure under a pulsed laser with high peak power. The results verify that the trapping states, including the position, width, and depth of the potential well, can be dynamically modulated by changing intensity of the incident laser. It provides an effective approach for stable trapping and dynamic controlling of particles on nanostructure-based plasmonic trapping platforms and thus has great application potential in many fields, such as enhanced Raman detection, super-resolution imaging, and optical sensing.
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