Journal
ACS PHOTONICS
Volume 1, Issue 5, Pages 454-463Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ph500032d
Keywords
plexciton; strong coupling surface plasmon; molecular exciton
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Funding
- Foundation for Polish Science via the project HOMING [PLUS/2013-7/1]
- Swedish Foundation for Strategic Research
- Swedish Research Council (VR)
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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. [GRAPHICS]
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