High-order-harmonic generation from inhomogeneous fields

M. F. Ciappina*, J. Biegert, R. Quidant, M. Lewenstein

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

115 Scopus citations

Abstract

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 Schrödinger 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.

Original languageEnglish
Article number033828
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Volume85
Issue number3
DOIs
StatePublished - 22 Mar 2012
Externally publishedYes

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