Issue 12, 2021

Selective switching of multiple plexcitons in colloidal materials: directing the energy flow at the nanoscale

Abstract

Coupling of molecular emitters to plasmon resonances in metal nanostructures has long been investigated to control the light–matter interaction at the nanoscale. The emergence of different coupling behaviors can be governed by the various combinations of emitters and plasmonic substrates, as well as the spatial arrangement of the individual components. Here colloidal assembly methods are exploited to prepare a responsive nanosystem where two sets of plexcitonic resonances in different coupling regimes can be selectively switched on and off, acting on external conditions such as concentration and presence of anions. The two sets of plexciton resonances are built exploiting the strong coupling between cationic gold nanoparticles and the same molecular moiety, an anionic porphyrin, in different aggregation states. When both plexciton resonances are simultaneously activated in the system, evidence for a plexciton relaxation cascade has been found in photoluminescence experiments. These findings have fundamental implications for achieving control over energy flow at the nanoscale.

Graphical abstract: Selective switching of multiple plexcitons in colloidal materials: directing the energy flow at the nanoscale

Supplementary files

Article information

Article type
Communication
Submitted
05 Feb 2021
Accepted
23 Feb 2021
First published
12 Mar 2021
This article is Open Access
Creative Commons BY-NC license

Nanoscale, 2021,13, 6005-6015

Selective switching of multiple plexcitons in colloidal materials: directing the energy flow at the nanoscale

N. Peruffo, G. Gil, S. Corni, F. Mancin and E. Collini, Nanoscale, 2021, 13, 6005 DOI: 10.1039/D1NR00775K

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