Abstract
A femtosecond frequency-domain interferometer is applied to metal-free and vanadyl phthalocyanine (H2Pc and VOPc) thin films to measure time-resolved difference phase and transmission spectra simultaneously. For both samples, the phase-change dynamics is different from the transmission-change dynamics at 620 nm, reflecting that the phthalocyanines (Pc) cannot be modeled with a two-level system but by a multi-level or inhomogeneously broadened system, in which each level pair exhibits different relaxation dynamics. Because of this dynamical difference, a phase-change measurement is required to correct distortion of the transient spectra due to induced phase modulation of probe pulses. Near zero time delay, the phase and transmission changes show different growth behavior. This behavior is explained by antisymmetric amplitude and phase gratings which are produced by coherent coupling between frequency-chirped pump and probe pulses.
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Formerly V. S. Williams
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Tokunaga, E., Terasaki, A., Wada, T. et al. Femtosecond phase spectroscopy of multi-level systems: Phthalocyanines. Appl. Phys. B 63, 255–264 (1996). https://doi.org/10.1007/BF01833795
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DOI: https://doi.org/10.1007/BF01833795