Fig. 8: Ultrafast carrier dynamics in two-photon absorption.
From: Optoelectronic properties and ultrafast carrier dynamics of copper iodide thin films
a TA spectra of as-grown CuI thin film under different pump fluences at a time delay of 0.5 ps with λp = 520 nm, and b corresponding kinetic traces at 406 nm with the best fitting (solid line). Inset in b shows the measured |∆A| signal (recorded at 5 ps) with quadratic scaling of the pump pulse fluence Fp with the linear fit (dotted line). c Z-scan of the as-grown CuI thin film under excitation with λp = 800 nm and Fp = 3.2 mJ/cm2. d \({{{{{\rm{ln}}}}}}\left(n\right)-{{{{{\rm{ln}}}}}}({n}_{0})\) vs. \((t-{t}_{0})\) plots under different pump fluences (λp = 520 nm). The dash lines represent their linear fits.
