Ultrafast transient absorption of eumelanin suspensions: the role of inverse Raman scattering

A. Aloi, A. Brunetti, G. Perna, M. Lasalvia, V. Capozzi, R. Tommasi

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Abstract

An ultrafast investigation is carried out on synthetic eumelanin suspended either in water or in DMSO-methanol. Upon photoexcitation by visible femtosecond pulses, the transient absorption (TA) dynamics of the suspensions are probed in a broad visible spectral range, showing clear nonlinearities. The latter arise from pump-probe interactions that induce the inverse Raman scattering (IRS) effect. We show how eumelanin TA dynamics are modified in proximity of the solvent Stokes and anti-Stokes scattering peaks, demonstrating that IRS affects the sign of TA but not the relaxation times. We compare the results obtained in both suspensions, unveiling the role of the surrounding environment. Eventually, the intrinsic response of synthetic eumelanin to ultrafast photoexcitation is evaluated.

Original languageEnglish
Article numberA041
Pages (from-to)4000-4013
Number of pages14
JournalBiomedical Optics Express
Volume6
Issue number10
DOIs
Publication statusPublished - 2015

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    Aloi, A., Brunetti, A., Perna, G., Lasalvia, M., Capozzi, V., & Tommasi, R. (2015). Ultrafast transient absorption of eumelanin suspensions: the role of inverse Raman scattering. Biomedical Optics Express, 6(10), 4000-4013. [A041]. https://doi.org/10.1364/BOE.6.004000