标题： 由非均匀等离子体场驱动的高阶谐波生成，空间受限：对截止定律的影响 显示英文标题

标题： High-order harmonic generation driven by inhomogeneous plasmonics fields spatially bounded: influence on the cut-off law

摘要： 我们研究由等离子增强场驱动的模型原子中的高阶谐波生成（HHG）。这些场是通过少周期激光脉冲照射等离子纳米结构产生的。我们证明了激光电场的空间非均匀特性，以高斯形状函数的形式，导致了HHG截止与激光波长之间的意外关系。对等离子增强场的空间形式的精确描述使我们能够预测这种关系。我们将时间依赖薛定谔方程（TDSE）的数值解与从三维有限元模拟中获得的等离子增强电场相结合。我们还采用经典模拟来补充TDSE的结果，并通过相关的电子轨迹来表征扩展的HHG光谱。对空间非均匀激光电场的正确定义对于准确描述由等离子增强场驱动的HHG的基本物理现象至关重要。这种表征为通过各种实验纳米装置控制HHG开辟了新的前景。 显示英文摘要

摘要： We study high-order harmonic generation (HHG) in model atoms driven by plasmonic-enhanced fields. These fields result from the illumination of plasmonic nanostructures by few-cycle laser pulses. We demonstrate that the spatial inhomogeneous character of the laser electric field, in a form of Gaussian-shaped functions, leads to an unexpected relationship between the HHG cutoff and the laser wavelength. Precise description of the spatial form of the plasmonic-enhanced field allows us to predict this relationship. We combine the numerical solutions of the time-dependent Schr\"odinger equation (TDSE) with the plasmonic-enhanced electric fields obtained from 3D finite element simulations. We additionally employ classical simulations to supplement the TDSE outcomes and characterize the extended HHG spectra by means of their associated electron trajectories. A proper definition of the spatially inhomogeneous laser electric field is instrumental to accurately describe the underlying physics of HHG driven by plasmonic-enhanced fields. This characterization opens new perspectives for HHG control with various experimental nano-setups