Fig. 2: Extraction and benchmarking of the picosecond transient dielectric function of CsPbBr3.
From: Extracting quantitative dielectric properties from pump-probe spectroscopy
a Broadband transient transmission spectrum of CsPbBr3. b Contribution of changes in the real and imaginary part of the dielectric function to the measured transient transmission at 500 and 2500 fs, demonstrating that transient transmission is a very sensitive measure of changes in the underlying imaginary dielectric function. c The transient dielectric function and normalised transient spectra S(ω) computed from the measured differential transmission at 500 fs demonstrating that neither the transient reflection and transmission capture the spectral information of ∆ε2 exactly. d Comparison of the extracted ∆n(ω) with that retrieved from a time-resolved frequency domain interferometry (FDI) experiment on the same sample at the same excitation density demonstrating quantitative agreement. Inset: Comparison of ∆n(ω) kinetics over the two spectral bands indicated.
