Author/Authors :
Martini، نويسنده , , Matteo and Roux، نويسنده , , Stéphane and Montagna، نويسنده , , Maurizio and Pansu، نويسنده , , Robert and Julien، نويسنده , , Carine and Tillement، نويسنده , , Olivier and Perriat، نويسنده , , Pascal، نويسنده ,
Abstract :
Self-quenching, that limits the luminescence of silica particles containing fluorophores, can be reduced by the presence of gold inclusions within silica. This reduction originates from a dramatic decrease of the non-radiative decay rate, the presence of metal impeding energy transfers to fluorescein quenchers. This Letter describes the modification of energy transfers induced by gold by performing systematic steady-state and time-resolved anisotropy measurements. For the lowest dyes concentration, gold accelerates by one order of magnitude the rate of fluorescein energy homotransfer. The hopping time is then unexpectedly found to be independent of the distance between the fluorophores.
