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High‐order harmonic generation by a spatially inhomogeneous field
Author(s) -
Fetić Benjamin,
Kalajdžić Kenan,
Milošević Dejan B.
Publication year - 2013
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.201200184
Subject(s) - physics , cutoff , field (mathematics) , momentum (technical analysis) , high harmonic generation , harmonic , envelope (radar) , plasmon , semiclassical physics , above threshold ionization , ionization , quantum electrodynamics , quantum mechanics , quantum , laser , photoionization , mathematics , telecommunications , radar , finance , computer science , pure mathematics , economics , ion
Plasmonic field‐enhanced high‐order harmonic generation is investigated theoretically. The plasmonic field is modeled as a spatially inhomogeneous field with a time‐dependent cosine squared pulse envelope. A method for solution of the three‐dimensional time‐dependent Schrödinger equation for a hydrogen atom in such a field is presented. It was found that the harmonic cutoff can be significantly increased. For larger values of the inhomogeneity parameter and longer pulses additional plateaus with higher cutoffs appear in the harmonic spectra. A semiclassical method, which takes into account nonzero initial coordinate and momentum of the ionized electron, is also developed. Using this method the observed multiplateau structure and cutoff positions are explained.