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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 24 — Nov. 19, 2012
  • pp: 26261–26274

Enhancement of high harmonic generation by confining electron motion in plasmonic nanostrutures

M. F. Ciappina, Srdjan S. Aćimović, T. Shaaran, J. Biegert, R. Quidant, and M. Lewenstein  »View Author Affiliations


Optics Express, Vol. 20, Issue 24, pp. 26261-26274 (2012)
http://dx.doi.org/10.1364/OE.20.026261


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Abstract

We study high-order harmonic generation (HHG) resulting from the illumination of plasmonic nanostructures with a short laser pulse of long wavelength. We demonstrate that both the confinement of the electron motion and the inhomogeneous character of the laser electric field play an important role in the HHG process and lead to a significant increase of the harmonic cutoff. In particular, in bow-tie nanostructures with small gaps, electron trajectories with large excursion amplitudes experience significant confinement and their contribution is essentially suppressed. In order to understand and characterize this feature, we combine the numerical solution of the time-dependent Schrödinger equation (TDSE) with the electric fields obtained from 3D finite element simulations. We employ time-frequency analysis to extract more detailed information from the TDSE results and classical tools to explain the extended harmonic spectra. The spatial inhomogeneity of the laser electric field modifies substantially the electron trajectories and contributes also to cutoff increase.

© 2012 OSA

OCIS Codes
(320.7120) Ultrafast optics : Ultrafast phenomena
(250.5403) Optoelectronics : Plasmonics

ToC Category:
Ultrafast Optics

History
Original Manuscript: September 25, 2012
Revised Manuscript: October 24, 2012
Manuscript Accepted: October 25, 2012
Published: November 6, 2012

Citation
M. F. Ciappina, Srdjan S. Aćimović, T. Shaaran, J. Biegert, R. Quidant, and M. Lewenstein, "Enhancement of high harmonic generation by confining electron motion in plasmonic nanostrutures," Opt. Express 20, 26261-26274 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-24-26261


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