Two-dimensional filtering in the Fourier domain of transient grating coherent artifacts in time-resolved spectroscopy

Marlo Vega (1, 2, 3) , Jean-François Bryche (1, 2, 4) , P.-L. Karsenti (4) , Philippe Gogol (1, 2, 5) , M. Canva (1, 2, 6, 7) , P.G. Charette (1, 2)

1 LN2 - Laboratoire Nanotechnologies et Nanosystèmes [Sherbrooke]
2 3IT - Institut Interdisciplinaire d'Innovation Technologique [Sherbrooke]
3 Laboratoire Charles Fabry / Biophotonique
4 UdeS - Faculté des sciences [Sherbrooke]
5 C2N - Centre de Nanosciences et de Nanotechnologies
6 CNRS - Centre National de la Recherche Scientifique
7 IOGS - Institut d'Optique Graduate School

Removal of coherent artifacts is important in the analysis of time and wavelength resolved spectroscopy data. By taking advantage of the strong correlation between spectra acquired sequentially in time, artifact removal can be formulated as a 2D problem for improved effectiveness. This paper proposes a 2D method to remove transient grating coherent artifacts from femtosecond time-resolved spectroscopy data based on filtering in the Fourier domain, leading to better estimation of the material parameters from the measured data. The method is simple, intuitive, and light on computation resources. The effectiveness of the method is demonstrated with experimental data acquired from a bare gold film with and without coherent artifacts using mutually parallel and perpendicular pump/probe polarizations, as well as with more complex samples (nanostructured gold film on a glass substrate and rhodamine fluorophores in solution). The proposed method is expected to be applicable to coherent artifact removal in other types of time and wavelength-resolved spectroscopy data.

Mots clés: Femtosecond time resolved spectroscopy; Pump-probe spectroscopy; Non-linear coherent artifact filtering; Transient grating artifact; Fourier domain filtering; Femtosecond time resolved spectroscopy Pump-probe spectroscopy Non-linear coherent artifact filtering Transient grating artifact Fourier domain filtering; Femtosecond time resolved spectroscopy; Non-linear coherent artifact filtering Transient grating artifact

Domaines: Physique [physics]

Marlo Vega, Jean-François Bryche, P.-L. Karsenti, Philippe Gogol, M. Canva, et al.. Two-dimensional filtering in the Fourier domain of transient grating coherent artifacts in time-resolved spectroscopy. Analytica Chimica Acta, 2023, 1279, pp.341820. ⟨10.1016/j.aca.2023.341820⟩. ⟨hal-04233716⟩