The ionization and high harmonic generation from two-dimensional quasiperiodic structures in strong laser fields are studied by numerically solving the time-dependent Schrödinger equation, in which a two-dimensional Kronig–Penney potential has been adopted to mimic the target. The two-dimensional photoelectron momentum distribution is significantly governed by the two-dimensional quasiperiodic potential, and thus is distinct from the single atom case. The low order harmonics initiated by a circularly polarized driving laser field are also circularly polarized and present alternative helicities; however, the high order harmonics deviate from circular polarization due to the unstable phase variation between different components. This calculation shows that elliptically polarized harmonics can be effectively generated by a circularly polarized driving laser field, and it sheds light on laser–surface interaction.
© 2016 Optical Society of AmericaFull Article | PDF Article
9 December 2016: A correction was made to the pagination.
OSA Recommended Articles
A. Gazibegović-Busuladžić, W. Becker, and D. B. Milošević
Opt. Express 26(10) 12684-12697 (2018)
Jianghua Luo and Fujun Chen
J. Opt. Soc. Am. B 35(12) 3104-3109 (2018)
E. Hasović, W. Becker, and D. B. Milošević
Opt. Express 24(6) 6413-6424 (2016)