Multi-Scale Simulation for Transient Absorption Spectroscopy under Intense Few-Cycle Pulse Laser

Abstract

Numerical pump-probe simulations for the sub-cycle transient spectroscopy of thin film diamond under intense few cycle pulse laser field is reported. The electron dynamics is calculated by the time-dependent Kohn-Sham equation. Simultaneously, the propagation of electromagnetic field is calculated by the Maxwell equation. Our result shows that the modulation of the reflectivity, transmission, and absorption around the optical gap do not coincide with the field amplitude of the pump laser. The phase shift of the modulation with respect to the pump field depends on the pump intensity and probe frequency. The modulation of the reflectivity is sensitive to the choice of the exchange-correlation potential, and dynamical effect of the mean-field in meta-GGA potential.

Analytical formulation for modulation of time-resolved dynamical Franz-Keldysh effect by electron excitation in dielectrics

“…The transition matrix |P k | 2 is calculated using Eq. (21). We can evaluate the reliability of our assumptions by comparing Eq.…”

“…In previous works, the sub-cycle oscillations of the optical properties evident in the timeresolved dynamical Franz-Keldysh effect (Tr-DFKE) was reported 10,[15][16][17][18] . This effect manifests as the response of many dressed states at probe time in the absence of electron excitations [19][20][21][22] . A similar effect was reported by Uchida et al from the excitonic states in GaAs quantum wells 13 .…”