High-order harmonic generation driven by inhomogeneous plasmonics fields spatially bounded: influence on the cut-off law

0501238 - FZÚ 2019 RIV GB eng J - Článek v odborném periodiku
Neyra, E. - Videla, F. - Ciappina, Marcelo F. - Perez-Hernandez, J. A. - Roso, L. - Lewenstein, M. - Torchia, G.A.
High-order harmonic generation driven by inhomogeneous plasmonics fields spatially bounded: influence on the cut-off law.
Journal of Optics. Roč. 20, č. 3 (2018), s. 1-9, č. článku 034002. ISSN 2040-8978. E-ISSN 2040-8986
Grant CEP: GA MŠMT EF16_019/0000789; GA MŠMT LQ1606; GA MŠMT EF16_013/0001793
Grant ostatní: OP VVV - ADONIS(XE) CZ.02.1.01/0.0/0.0/16_019/0000789; OP VVV - ELITAS(XE) CZ.02.1.01/0.0/0.0/16_013/0001793
Institucionální podpora: RVO:68378271
Klíčová slova: plasmonics * high-order harmonic generation * attosecond pulses
Obor OECD: Fluids and plasma physics (including surface physics)
Impakt faktor: 2.753, rok: 2018

We study high-order harmonic generation (HHG) in model atoms driven by plasmonic-enhanced fields. These fields result from the illumination of plasmonic nanostructures by few-cycle laser pulses. We demonstrate that the spatial inhomogeneous character of the laser electric field, in a form of Gaussian-shaped functions, leads to an unexpected relationship between the HHG cutoff and the laser wavelength. Precise description of the spatial form of the plasmonic-enhanced field allows us to predict this relationship. We combine the numerical solutions of the time-dependent Schrodinger equation (TDSE) with the plasmonic-enhanced electric fields obtained from 3D finite element simulations. We additionally employ classical simulations to supplement the TDSE outcomes and characterize the extended HHG spectra by means of their associated electron trajectories.
Trvalý link: http://hdl.handle.net/11104/0293231