Long-distance optical pulling of nanoparticle in a low index cavity using a single plane wave
Long-distance optical pulling of nanoparticle in a low index cavity using a single plane wave
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DOI：
10.1126/sciadv.aaz3646
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发表时间：
2020-05-01
期刊：
影响因子：
13.6
通讯作者：
Luo, T.
中科院分区：
文献类型：
--
作者：
Lee, E.;Luo, T.
光拉力（OPF）可以使纳米粒子（NP）逆着入射光的传播方向运动。长距离光学牵引是纳米物体操纵的高度期望，但其实现仍然具有挑战性。我们提出了一种NP-腔结构，当包裹NP的球形腔的折射率低于介质的折射率时，该结构可以被单个平面波拉动以进行长距离传播。电磁多极子分析表明，许多常见的材料制成的纳米粒子可以接收内的低折射率腔的OPF。使用二氧化硅-Au核-壳NP被等离子体纳米气泡封装，我们实验证明，一个单一的激光可以拉动Au NP-在纳米气泡结构为类似0.1 mm。这些结果可能会导致实际应用，可以使用NP的光拉动，如光驱动的纳米结构组件和纳米游泳者。
Optical pulling force (OPF) can make a nanoparticle (NP) move against the propagation direction of the incident light. Long-distance optical pulling is highly desired for nano-object manipulation, but its realization remains challenging. We propose an NP-in-cavity structure that can be pulled by a single plane wave to travel long distances when the spherical cavity wrapping the NP has a refractive index lower than the medium. An electromagnetic multipole analysis shows that NPs made of many common materials can receive the OPF inside a lower index cavity. Using a silica-Au core-shell NP that is encapsulated by a plasmonic nanobubble, we experimentally demonstrate that a single laser can pull the Au NP-in-nanobubble structure for similar to 0.1 mm. These results may lead to practical applications that can use the optical pulling of NP, such as optically driven nanostructure assembly and nanoswimmers.