Ballistic supercavitating nanoparticles driven by single Gaussian beam optical pushing and pulling forces
Ballistic supercavitating nanoparticles driven by single Gaussian beam optical pushing and pulling forces
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DOI：
10.1038/s41467-020-16267-9
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发表时间：
2020-05-15
影响因子：
16.6
通讯作者：
Luo, Tengfei
中科院分区：
文献类型：
--
作者：
Lee, Eungkyu;Huang, Dezhao;Luo, Tengfei
流体中纳米级物体的定向高速运动可具有广泛的应用，例如分子机械、纳米机器人和材料组装。在此，我们报道了具有前所未有的速度（336,000μm s⁻¹）的弹道等离子体金纳米粒子（NP）游动体，其通过单个高斯激光束的光推力以及拉力来实现。独特的纳米粒子 - 激光相互作用使光拉力和高速运动成为可能。在表面等离子体共振峰处被激光激发的金纳米粒子能够产生一个纳米级气泡，该气泡可包裹纳米粒子（即超空化），为其移动创造一个几乎无摩擦的环境，就像莱顿弗罗斯特效应一样。某些气泡内纳米粒子的结构可导致纳米粒子逆着光子流受到光拉力。所展示的超快速、光驱动的纳米粒子运动可能有益于广泛的纳米和生物应用，并为光拉力领域提供新的见解。
Directed high-speed motion of nanoscale objects in fluids can have a wide range of applications like molecular machinery, nano robotics, and material assembly. Here, we report ballistic plasmonic Au nanoparticle (NP) swimmers with unprecedented speeds (336,000 mu m s(-1)) realized by not only optical pushing but also pulling forces from a single Gaussian laser beam. Both the optical pulling and high speeds are made possible by a unique NP-laser interaction. The Au NP excited by the laser at the surface plasmon resonance peak can generate a nanoscale bubble, which can encapsulate the NP (i.e., supercavitation) to create a virtually frictionless environment for it to move, like the Leidenfrost effect. Certain NP-in-bubble configurations can lead to the optical pulling of NP against the photon stream. The demonstrated ultra-fast, light-driven NP movement may benefit a wide range of nano- and bio-applications and provide new insights to the field of optical pulling force.