Zhang Xiao-Ming, Yu Jin-Jing, Wu Hai-Ping, Zhou Xia, Zhang Tian-Yue, Liu Jian-Ping
College of Physics Science and Engineering Technology, Yichun University, Yichun 336000, China.
College of Literature, Journalism and Communication, Yichun University, Yichun 336000, China.
Nanomaterials (Basel). 2023 Aug 5;13(15):2254. doi: 10.3390/nano13152254.
In this work, we demonstrate that optical pulling forces (OPFs) can be induced by a hybrid dimer consisting of a Si nanoparticle (NP) and a coated nanoparticle with a gain core and Au shell under normal plane wave illumination. Analytical theory reveals that the underlying physical mechanism relies on interactions between the electric dipole (ED) modes excited in the NPs. As compared with the individual NP, it is found that the magnitude of optical force can be enlarged by almost three orders for the Si NP and one order for the coated gain NP in the coupled dimer. In addition, we find that the OPFs exerted on the NPs are heavily dependent on the gain level of the core materials, the incident polarization angle and the sizes of the NPs. More interestingly, we find that the OPF can also be exerted on a trimer system consisting of two identical Si NPs and a coated NP arranged in a line. The related results could be used to propose a versatile platform for manipulating NPs.
在这项工作中，我们证明了在正常平面波照射下，由硅纳米颗粒（NP）和具有增益芯与金壳的包覆纳米颗粒组成的混合二聚体能够诱导产生光拉力（OPF）。分析理论表明，其潜在的物理机制依赖于纳米颗粒中激发的电偶极（ED）模式之间的相互作用。与单个纳米颗粒相比，发现在耦合二聚体中，硅纳米颗粒的光力大小可增大近三个数量级，包覆增益纳米颗粒的光力大小可增大一个数量级。此外，我们发现作用在纳米颗粒上的光拉力严重依赖于芯材料的增益水平、入射偏振角和纳米颗粒的尺寸。更有趣的是，我们发现光拉力也能作用于由两个相同的硅纳米颗粒和一个排成一行的包覆纳米颗粒组成的三聚体系统。相关结果可用于构建一个用于操控纳米颗粒的通用平台。
