arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.07243physics.optics
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双偶极介电纳米粒子二聚体的横向光学结合

Transverse optical binding for a dual dipolar dielectric nanoparticle dimer

Xiao-Yong Duan, Graham D. Bruce, Kishan Dholakia, Zhi-Guo Wang, Feng Li, Ya-Ping Yang

摘要:

横向光学约束力和扭矩超出瑞利近似的物理起源还没有清楚地表达日期。在这里,我们提出了一个双偶极介电二聚体的力和扭矩的解析表达式由垂直于二聚体轴传播的平面波照射。使用这个分析模型,我们探讨的杂化电偶极,磁偶极,和电磁偶极耦合相互作用的粒子上的总的力和扭矩的作用。我们发现显着偏离瑞利近似的预测,特别是对于高折射率粒子,其中的力是由磁相互作用占主导地位。与瑞利近似的预测相比,这导致二聚体稳定性增强一到四个数量级。对于扭矩的情况,这是由耦合相互作用,并增加了一个数量级。我们的研究结果将有助于指导未来的实验工作在高折射率电介质粒子的光学绑定。

英文摘要:

The physical origins of the transverse optical binding force and torque beyond the Rayleigh approximation have not been clearly expressed to date. Here, we present analytical expressions of the force and torque for a dual dipolar dielectric dimer illuminated by a plane wave propagating perpendicularly to the dimer axis. Using this analytical model, we explore the roles of the hybridized electric dipolar, magnetic dipolar, and electric-magnetic dipolar coupling interactions in the total force and torque on the particles. We find significant departures from the predictions of the Rayleigh approximation, particularly for high-refractive-index particles, where the force is dominated by the magnetic interaction. This results in an enhancement of the dimer stability by one to four orders of magnitude compared to the predictions of the Rayleigh approximation. For the case of torque, this is dominated by the coupling interaction and increases by an order of magnitude. Our results will help to guide future experimental work in optical binding of high-refractive-index dielectric particles.

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