Exciton-Plasmon Coupling Enhancement via Metal Oxidation

Abstract

In this paper, we report on the effect of metal oxidation on strong coupling interactions between silver nanostructures and a J-aggregated cyanine dye. We show that metal oxidation can sensibly affect the plexcitonic system, inducing a change in the coupling strength. In particular, we demonstrate that the presence of oxide prevents the appearance of Rabi splitting in the extinction spectra for thick spacers. In contrast, below a threshold percentage, the oxide layer results in an higher coupling strength between the plasmon and the Frenkel exciton. Contrary to common belief, a thin oxide layer seems thus to act, under certain conditions, as a coupling mediator between an emitter and a localized surface plasmon excited in a metallic nanostructure. This suggests that metal oxidation can be exploited as a means to enhance light-matter interactions in strong coupling applications.


Autore Pugliese

Tutti gli autori

  • Todisco F. , D'Agostino S. , Esposito M. , Fernández-Domínguez A.I. , De Giorgi M. , Ballarini D. , Dominici L. , Tarantini I. , Cuscuná M. , Della Sala F. , Gigli G. , Sanvitto D.

Titolo volume/Rivista

ACS NANO


Anno di pubblicazione

2015

ISSN

1936-0851

ISBN

Non Disponibile


Numero di citazioni Wos

Nessuna citazione

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Numero di citazioni Scopus

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Settori ERC

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Codici ASJC

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