Plasmon-Exciton Interactions in a Core-Shell Geometry: From Enhanced Absorption to Strong Coupling
Journal article, 2014

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.


molecular exciton

strong coupling surface plasmon


Tomasz Antosiewicz

Chalmers, Applied Physics, Bionanophotonics

Peter Apell

Chalmers, Applied Physics

Timur Shegai

Chalmers, Applied Physics, Bionanophotonics

ACS Photonics

2330-4022 (eISSN)

Vol. 1 5 454-463

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Other Engineering and Technologies



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