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.
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9 December 2016: A correction was made to the pagination.
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