Davletshin Yevgeniy R, Kumaradas J Carl
Department of Physics, Ryerson University, Toronto, ON, M5B 2K3, Canada.
Beilstein J Nanotechnol. 2016 Jun 16;7:869-80. doi: 10.3762/bjnano.7.79. eCollection 2016.
This paper presents a theoretical study of the interaction of a 6 ps laser pulse with uncoupled and plasmon-coupled gold nanoparticles. We show how the one-dimensional assembly of particles affects the optical breakdown threshold of its surroundings. For this purpose we used a fully coupled electromagnetic, thermodynamic and plasma dynamics model for a laser pulse interaction with gold nanospheres, nanorods and assemblies, which was solved using the finite element method. The thresholds of optical breakdown for off- and on-resonance irradiated gold nanosphere monomers were compared against nanosphere dimers, trimers, and gold nanorods with the same overall size and aspect ratio. The optical breakdown thresholds had a stronger dependence on the optical near-field enhancement than on the mass or absorption cross-section of the nanostructure. These findings can be used to advance the nanoparticle-based nanoscale manipulation of matter.
本文对6皮秒激光脉冲与未耦合及等离子体耦合的金纳米颗粒之间的相互作用进行了理论研究。我们展示了颗粒的一维组装如何影响其周围环境的光学击穿阈值。为此，我们使用了一个完全耦合的电磁、热力学和等离子体动力学模型来研究激光脉冲与金纳米球、纳米棒及组装体的相互作用，该模型采用有限元法求解。将非共振和共振辐照的金纳米球单体的光学击穿阈值与具有相同总体尺寸和纵横比的纳米球二聚体、三聚体及金纳米棒的光学击穿阈值进行了比较。光学击穿阈值对光学近场增强的依赖性比对纳米结构的质量或吸收截面的依赖性更强。这些发现可用于推进基于纳米颗粒的物质纳米级操纵。
