Plasmon signatures in high harmonic generation

High harmonic generation in polarizable multi-electron systems is investigated in the framework of multi-configuration time-dependent Hartree-Fock. The harmonic spectra exhibit two cut-offs. The first cut-off is in agreement with the well-established, single active electron cut-off law. The second c...

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Bibliographic Details
Published in:Journal of physics. B, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2006-02, Vol.39 (3), p.709-718
Main Authors: Zanghellini, J, Jungreuthmayer, Ch, Brabec, T
Format: Article
Language:English
Subjects:
Exact sciences and technology
Frequency conversion
harmonic generation, including high-order harmonic generation
Fundamental areas of phenomenology (including applications)
Nonlinear optics
Optics
Physics
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Summary:High harmonic generation in polarizable multi-electron systems is investigated in the framework of multi-configuration time-dependent Hartree-Fock. The harmonic spectra exhibit two cut-offs. The first cut-off is in agreement with the well-established, single active electron cut-off law. The second cut-off presents a signature of multi-electron dynamics. The strong laser field excites nonlinear plasmon oscillations. Electrons that are ionized from one of the multi-plasmon states and recombine to the ground state gain additional energy, thereby creating the second plateau.
ISSN:0953-4075
1361-6455
DOI:10.1088/0953-4075/39/3/022