The FDTD numerical simulations are used to investigate the time evolution of the two-level system of conduction and valence bands. Free carriers’ population dynamics in the conduction band for large intensities of the ultrashort pulse (100 fs) is calculated. The results show that time-dependent real part of the optical permittivity at ENZ spectral point is saturated and resembles a step function as the ultrashort pulse amplitude reaches ~1010 V/m. The calculated value of the intensity-dependent refractive index is n2~-2×10-11 cm2/W. The results demonstrate that increasing initial carrier concentration from ~2×1020cm-3 to ~4×1020cm-3 leads to a significant n2 magnitude change.
Recent advances in understanding of ultrashort pulse propagation in multilayered AZO/ZnO ENZ metamaterial are presented. The influence of the material parameters for AZO/ZnO metamaterial on chromatic dispersion are discussed. Numerical approach based on a full wave analysis of the ultrashort pulse propagation in the presence of enormous second-order dispersion was used to investigate ultrashort pulse propagation through ENZ AZO/ZnO metamaterial. An approach using an adaptive pre-shaping algorithm for ultrashort pulse distortion compensation during the propagation at the ENZ spectral point is introduced. The results based on auxiliary differential equation finite-difference time domain method that show a dramatic change in shape for the probe pulse modulated using pump pulses of various duration (100-500 fs) and amplitude (106−1010 V/m) are presented.
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