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O: Fachverband Oberflächenphysik
O 24: Poster Session II: Plasmonics and nanooptics II
O 24.7: Poster
Monday, March 1, 2021, 13:30–15:30, P
Hot electrons masquerading as plexcitons in J-aggregate/ plasmonic nanoparticle systems — •Victoria C. A. Taylor1, Sara Núñez-Sánchez2, and Thomas A. A. Oliver3 — 1Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany — 2Universidade de Vigo, Departamento de Química Física, Campus Universitario As Lagoas, Marcosende, 36310 Vigo, Spain — 3School of Chemistry, University of Bristol, Bristol, BS8 1TS, UK
Surface plasmon polaritons (SPPs) can produce localised high electric field strengths. Through strong coupling with quantum emitters, they can create hybrid states with novel and promising properties. Excitons in J-aggregates, coupled with SPPs on metallic nanoparticles, are ideal systems for studying these effects. The hybrid quasiparticles that form in these systems under strong coupling are sometimes referred to as plexcitons (plasmon/exciton). Several studies have investigated the dynamics of these plexcitons and report lifetimes on the order of picoseconds, which is in strong contrast to the tens of femtoseconds lifetimes that are typically associated with SPPs.
In this work, we investigate the ultrafast transient absorption response of a TDBC J-aggregate/hollow gold nanoshells (HGNs) hybrid system. Through our excitation wavelength dependence measurements, and comparison with the response of the uncoupled HGNs, we show that the observed picosecond signal does not result from long-lived plexcitons; rather, it is caused by the hot electron population that remains after the plexciton has dephased.