Journal
NANO LETTERS
Volume 11, Issue 6, Pages 2318-2323Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl200579f
Keywords
Quantum optics; plasmon; exciton; plexciton; fano resonance
Categories
Funding
- Spanish MICINN [MAT2010-14885]
- Consolider NanoLight.es
- European Commission [FP7-ICT-2009-4-248909-LIMA, FP7-ICT-2009-4-248855-N4E]
- Spanish ME
- U.S. Department of Energy
- Robert A. Welch Foundation [C-1222]
- EPSRC [EP/G060363/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/G060363/1] Funding Source: researchfish
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We present a fully quantum mechanical approach to describe the coupling between plasmons and excitonic systems such as molecules or quantum dots. The formalism relies on Zubarev's Green functions, which allow us to go beyond the perturbative regime within the internal evolution of a plasmonic nanostructure and to fully account for quantum aspects of the optical response and Fano resonances in plasmon-excition (plexcitonic) systems. We illustrate this method, with two examples consisting of an exciton-supporting quantum emitter placed either in the vicinity of a single metal nanoparticle or in the gap of a nanoparticle dimer. The optical absorption of the combined emitter dimer structure is shown to undergo dramatic changes when the emitter excitation level is tuned across the gap-plasmon resonance. Our work opens a new avenue to deal with strongly interacting plasmon-excition hybrid systems.
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