来自等离子体阿基米德螺旋线的螺线管光学力。
Solenoidal optical forces from a plasmonic Archimedean spiral.
作者信息
Zaman Mohammad Asif, Padhy Punnag, Hesselink Lambertus
机构信息
Department of Electrical Engineering, Stanford University, Stanford, California 94305, USA.
出版信息
Phys Rev A (Coll Park). 2019 Jul;100(1). doi: 10.1103/physreva.100.013857. Epub 2019 Jul 31.
The optical forces generated by a right-handed plasmonic Archimedean spiral (PAS) have been mapped and analyzed. By changing the handedness of the circularly polarized excitation, the structure can switch from a trapping force profile to a rotating force profile. The Helmholtz-Hodge decomposition method has been used to separate the solenoidal component and the conservative component of the force and quantify their relative magnitude. It is shown that the for right-hand circularly polarized excitation, the PAS creates a significant amount of solenoidal forces. Using the decomposed force components, an intuitive explanation of the motion of micro- and nanoparticles in the force field is presented. Vector field topology is used to visualize the force components. The analysis is found to be consistent with numerical and experimental results. Due to the intuitive nature of the analysis, it can be used in the initial design process of complex laboratory-on-a-chip systems where a rigorous analysis is computationally expensive.
已对由右手等离子体阿基米德螺旋（PAS）产生的光学力进行了映射和分析。通过改变圆偏振激发的手性，该结构可以从捕获力分布切换到旋转力分布。亥姆霍兹 - 霍奇分解方法已被用于分离力的螺线管分量和保守分量，并量化它们的相对大小。结果表明，对于右手圆偏振激发，PAS会产生大量的螺线管力。利用分解后的力分量，对微纳米粒子在力场中的运动给出了直观解释。矢量场拓扑用于可视化力分量。分析结果与数值和实验结果一致。由于该分析具有直观性，它可用于复杂的芯片实验室系统的初始设计过程，在这种情况下，严格的分析在计算上成本很高。
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