Laser-induced terahertz radiation from one-dimensional Fibonacci quasicrystals

Terahertz (THz) radiation from quasicrystals in intense laser fields is simulated by solving the time-dependent Schrödinger equation (TDSE) in momentum space. Wave function information can be comprehensively reserved in momentum space without absorbing boundary conditions, which is different from coordinate space. The results of numerical calculations indicate that broadband THz radiation can be efficiently generated in one-dimensional Fibonacci quasicrystals due to their inherent quasi-periodic properties. In the two-color laser field, THz radiation is predominantly generated by the second harmonic field, which is slightly higher than that by the monochromatic field. Furthermore, the peak intensity of THz radiation exhibits a third-order nonlinear relationship with respect to the pump laser intensity. This work sheds light on the possibility of quasicrystals to serve as new THz sources.