High-order-harmonic generation from inhomogeneous fields

被引:154
作者
Ciappina, M. F. [1 ]
Biegert, J. [1 ,2 ]
Quidant, R. [1 ,2 ]
Lewenstein, M. [1 ,2 ]
机构
[1] ICFO Inst Ciences Foton, Castelldefels 08860, Barcelona, Spain
[2] ICREA, Barcelona 08010, Spain
来源
PHYSICAL REVIEW A | 2012年 / 85卷 / 03期
关键词
Cutoff frequency - Harmonic generation - Plasmonics;
D O I
10.1103/PhysRevA.85.033828
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
We present theoretical studies of high-order-harmonic generation (HHG) produced by nonhomogeneous fields resulting from the illumination of plasmonic nanostructures with a short laser pulse. We show that both the inhomogeneity of the local fields and the confinement of the electron movement play an important role in the HHG process and lead to the generation of even harmonics and a significantly increased cutoff, more pronounced for the longer-wavelength cases studied. In order to understand and characterize the new HHG features, we employ two different approaches: the numerical solution of the time-dependent Schrodinger equation and the semiclassical approach known as the strong-field approximation (SFA). Both approaches predict comparable results and show the new features, but by using the semiclassical arguments behind the SFA and time-frequency analysis tools, we are able to fully understand the reasons for the cutoff extension.
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页数:11
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