High-order harmonic generation from inhomogeneous fields

Details High-order harmonic generation from inhomogeneous fields High-order harmonic generation from inhomogeneous fields

2011-10-04

arxiv.org/abs/1110.0665v3

Physical Review A, 85, 033828 (2012)

Physics

Atomic Physics

25 pages, 12 figures

Scientific paper

10.1103/PhysRevA.85.033828

We present theoretical studies of high-order harmonic generation (HHG) produced by non-homogeneous fields as 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 wavelengths cases studied. In order to understand and characterize the new HHG features we employ two different approaches: the numerical solution of the time dependent Schr\"odinger equation (TDSE) and the semiclassical approach known as Strong Field Approximation (SFA). Both approaches predict comparable results and show the new features, but using the semiclassical arguments behind the SFA and time-frequency analysis tools, we are able to fully understand the reasons of the cutoff extension.

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