Separating distinct nanoparticles from a cluster by applying simple nonstructured light can be a novel approach for future industrial development. Understanding the type of distinct particles from a three-particle cluster (i.e., chiral, plasmonic, and dielectric) based on different near-field optical forces has not been reported so far. In most of the set ups, optical sorting is reported for radius-based sorting of Mie-ranged single object. Here, three different optical setups are proposed, illuminated by a linearly polarized plane wave (propagating along $\theta ={45}^{\circ }$ angle) in a particle cluster constructed with chiral, plasmonic, and dielectric nanoparticles in an air medium (case 1), half immersed in water (case 2), and fully immersed in water (case 3). All of those have supported the near-field optical sorting from the cluster of three Rayleigh sized particles. It is observed that the dielectric object experiences counter-intuitive optical pulling force mainly due to the effect of induced magnetic-type resonance created on nearby plasmonic object. In contrast, plasmonic objects experience optical pushing force due to the transferred momentum of photon and chiral objects experience lateral force mainly due to the induced magnetic dipole on the chiral object.

中文翻译：

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光学簇：等离子体、电介质和手性纳米粒子的近场光学分选和分离

通过应用简单的非结构光从簇中分离不同的纳米粒子可能是未来工业发展的一种新方法。迄今为止还没有报道基于不同的近场光学力来了解来自三粒子簇（即手性、等离子体和电介质）的不同粒子的类型。在大多数设置中，报告了光学分拣用于 Mie 范围单个对象的基于半径的分拣。在这里，提出了三种不同的光学设置，由线性偏振平面波（沿$\theta ={45}^{\circ }$角度）在由手性、等离子体和介电纳米粒子在空气介质中构建的粒子簇中（案例 1），一半浸入水中（案例 2），完全浸入水中（案例 3）。所有这些都支持从三个瑞利大小的粒子簇中进行近场光学分选。据观察，介电物体经历反直觉的光学拉力，主要是由于在附近等离子体物体上产生的感应磁共振型共振的影响。相比之下，等离子体物体由于光子的转移动量而受到光学推力，而手征物体主要由于手征物体上的感应磁偶极子而受到横向力。