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We study high-order harmonic generation (HHG) resulting from the illuminationof plasmonic nanostructures with a short laser pulse. We show that both theinhomogeneities of the local electric field and the confinement of the electronmotion play an important role in the HHG process and lead to a significantincrease of the harmonic cutoff. In order to understand and characterize thisfeature, we combine the numerical solution of the time dependent Schroedingerequation (TDSE) with the electric fields obtained from 3D finite elementsimulations. We employ time-frequency analysis to extract more detailedinformation from the TDSE results and to explain the extended harmonic spectra.Our findings have the potential to boost up the utilization of HHG as coherentextreme ultraviolet (XUV) sources.

Tailoring high-order harmonic generation with nonhomogeneous fields and electron confinement