用自洽流体力学方法在微观水平上计算的光学力、力矩和力密度
Optical forces, torques and force densities calculated at a microscopic level using a self-consistent hydrodynamics method
摘要：
在纳米尺度下，材料内的光学力密度分布的计算是具有挑战性的，其中出现量子和非局部效应，并且宏观参数（例如介电常数）变得不明确。我们证明了纳米等离子体激元系统的微观光学力密度可以使用自洽的流体力学模型来定义和计算，该模型包括量子，非局部和延迟效应。我们证明了这种技术，通过计算微观光学力密度分布和外部光诱导的纳米等离子体二聚体的光学结合力。我们发现，一个不均匀的分布的光学力密度可以导致一个自旋扭矩作用在单个粒子。
英文摘要：
The calculation of optical force density distribution within a material is challenging at the nanoscale, where quantum and non-local effects emerge and macroscopic parameters such as permittivity become ill-defined. We demonstrate that the microscopic optical force density of nanoplasmonic systems can be defined and calculated using a self-consistent hydrodynamics model that includes quantum, non-local and retardation effects. We demonstrate this technique by calculating the microscopic optical force density distributions and the optical binding force induced by external light on nanoplasmonic dimers. We discover that an uneven distribution of optical force density can lead to a spinning torque acting on individual particles.
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