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Plasmon-Exciton Interactions in a Core-Shell Geometry: From Enhanced Absorption to Strong Coupling

Tomasz Antosiewicz (Institutionen för teknisk fysik, Bionanofotonik) ; S. Peter Apell (Institutionen för teknisk fysik) ; Timur Shegai (Institutionen för teknisk fysik, Bionanofotonik)
Acs Photonics (2330-4022). Vol. 1 (2014), 5, p. 454-463.
[Artikel, refereegranskad vetenskaplig]

We present a detailed Mie theory, finite-difference time-domain, and quasi-static study of plasmon-exciton interactions in a spherical core shell geometry. In particular, we report absorption, scattering, and extinction cross sections of a hybrid core-shell system and identify several important interaction regimes that are determined by the electromagnetic field enhancement and the oscillator strength of electronic excitations. We assign these regimes to enhanced-absorption, exciton-induced transparency and strong coupling, depending on the nature of the observed spectra of the coupled plasmon-exciton resonances. We also show the relevance of performing single-particle absorption or extinction measurements in addition to scattering to validate the interaction regime. Furthermore, at relatively high, yet realistic oscillator strengths we observe emergence of a third mode, which is not predicted by a classical coupled harmonic oscillator model and is attributed to the geometrical resonance of the structure as a whole.

Nyckelord: plexciton, strong coupling surface plasmon, molecular exciton



Denna post skapades 2014-07-03. Senast ändrad 2017-09-14.
CPL Pubid: 200149

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Bionanofotonik (2007-2015)
Institutionen för teknisk fysik (1900-2015)

Ämnesområden

Teknisk fysik

Chalmers infrastruktur