Excited state absorption : a key phenomenon for the improvement of biphotonic based optical limiting at telecommunication wavelengths
Résumé
Spectroscopic properties, two-photon absorption (TPA) and excited state absorption (ESA), of two organic cyanine dyes and of a ruthenium based organometallic cyanine are compared in order to rationalize their similar ns-optical power limiting (OPL) efficiency in the telecommunication wavelength range. The TPA contribution to the ns-OPL behavior is higher for both organic cyanines, while the main process is a TPA-induced ESA in the case of the organometallic system, in which the ruthenium induces a broadening of the NIR-ESA band and resulting in a strong spectral overlap between TPA and ESA spectra.
Domaines
Chimie théorique et/ou physique
Origine : Fichiers produits par l'(les) auteur(s)
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