2017/08/31 by Guang-Rui Jia, Xin-Qiang Wang, Tao-Yuan Du +2 · 16 citations
Physics and Astronomy · #Circular polarization #Elliptical polarization #Harmonic #Harmonic spectrum #Harmonics #High harmonic generation #Laser #Laser-Matter Interactions and Applications #Nonlinear Photonic Systems #Spectroscopy and Quantum Chemical Studies #Ultrashort pulse #physics.optics
paper · pdf · doi:10.1063/1.5051598
published in The Journal of Chemical Physics 149(15), 154304 (American Institute of Physics)
openalex created_date 2017/08/31 · arxiv created 2018/03/27 · openalex publication_date 2018/10/18 · arxiv updated 2018/10/23 · openalex updated_date 2026/08/05
We studied the high-order harmonic generation (HHG) from 2D solid materials in circularly and bichromatic circularly polarized laser fields numerically by simulating the dynamics of single-active-electron processes in 2D periodic potentials. Contrary to the absence of HHG in the atomic case, circular HHGs below the bandgap with different helicities are produced from intraband transitions in solids with C4 symmetry driven by circularly polarized lasers. Harmonics above the bandgap are elliptically polarized due to the interband transitions. High-order elliptically polarized harmonics can be generated efficiently by both co-rotating and counter-rotating bicircular mid-infrared lasers. The cutoff energy, ellipticity, phase, and intensity of the harmonics can be tuned by the control of the relative phase difference between the 1ω and 2ω fields in bicircularly polarized lasers, which can be utilized as an ultrafast optical tool to image the structure of solids.