Nonperturbative Hydrodynamic Model for Multiple Harmonics Generation in Metallic Nanostructures
Nonperturbative Hydrodynamic Model for Multiple Harmonics Generation in Metallic Nanostructures
复制标题
DOI：
10.1021/ph500362y
复制
发表时间：
2015-01-01
期刊：
影响因子：
7
通讯作者：
Zayats, Anatoly V.
中科院分区：
文献类型：
--
作者：
Ginzburg, Pavel;Krasavin, Alexey V.;Zayats, Anatoly V.
自由电子气体的电磁响应导致纳米结构等离子体材料固有的非线性光学行为，通过强大的局部场增强和复杂的集体电子动力学实现。在这里，已经开发了金属中传导电子的流体动力学模型的时域实现，以使光和等离子体纳米结构之间的非线性相干相互作用的非摄动研究成为可能。考虑到对流加速度、洛伦兹力的磁贡献、量子电子压力和纳米结构边界的存在所产生的影响，导致了第二和第三次谐波的出现。提出的时域方法能够获得一个通用的、自洽的数值解，不需要任何近似，允许研究任意空间和时间形状的光脉冲的非线性光相互作用，为接近现实实验场景的描述提供了独特的机会。
The electromagnetic response of a free-electron gas leads to the inherent nonlinear optical behavior of nanostructured plasmonic materials enabled through both strong local field enhancements and complex collective electron dynamics. Here, a time-domain implementation of the hydrodynamic model for conduction electrons in metals has been developed to enable nonperturbative studies of nonlinear coherenet interactions between light and plasmonic nanostructures. The effects originating from the convective acceleration, the magnetic contribution of the Lorenz force, the quantum electron pressure, and the presence of the nanostructure's boundaries have been taken into account, leading to the appearance of both second and third harmonics. The proposed time-domain method enables obtaining a universal, self-consistent numerical solution, free from any approximations, allowing investigations of nonlinear optical interactions with arbitrary spatially and temporally shaped optical pulses, opening unique opportunities to approach description of realistic experimental scenarios.