纳米材料中局域和非局域shock waves的共存
Coexistence of local and nonlocal shock waves in nanomaterials
摘要：
高性能纳米材料对于先进的光子技术至关重要，如传感，激光，成像，数据存储，处理以及医疗和生物应用。金属纳米颗粒在其中扮演着关键的角色，因为局域表面等离子体共振增强了宿主材料的线性和非线性光学性质，从而增加了应用范围。改进的光学响应导致丰富的和很大程度上未探索的现象学。在目前的工作中，我们显示的形成和相互作用的两个分散的冲击波出现的金纳米棒的水悬浮液与脉冲激光束照射。通过分析使色散材料中的冲击波阵面规则化的特征波状孔，我们能够区分不同起源的色散冲击波，即，电子和热，首先共存，然后相互作用，形成一个等强度的双重战线。所观察到的情况下同意现有的文献报道的电子和热的非线性折射率的材料含有金纳米粒子的贡献。虽然对报告结果的全面理解值得进行分析描述，但它们已经为使用含有金属纳米颗粒的材料作为研究基本极端非线性现象和开发传感和控制新解决方案的平台铺平了道路。
英文摘要：
High-performing nanomaterials are paramount for advanced photonic technologies, like sensing, lasing, imaging, data storage, processing, and medical and biological applications. Metal nanoparticles play a key role, because the localized surface plasmonic resonances enhance the linear and nonlinear optical properties of hosting materials, thus increasing the range of applications. The improved optical response results in an enriched and largely unexplored phenomenology. In the present work, we show the formation and interaction of two dispersive shock waves emerging by illuminating an aqueous suspension of gold nanorods with a pulsed laser beam. By analyzing the characteristic undular bores that regularize a shock front in a dispersive material, we were able to distinguish dispersive shock waves of different origins, i.e., electronic and thermal, first coexisting and then interacting to form a double front of equal intensity. The observed scenario agrees with existing literature reporting an electronic and thermal contribution to the nonlinear refractive index of material containing gold nanoparticles. Although a full comprehension of the reported results deserves an analytical description, they already pave the way to using materials containing metal nanoparticles as a platform for studying fundamental extreme nonlinear phenomena and developing novel solutions for sensing and control.
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