Robustness of the Rabi splitting under nonlocal corrections in plexcitonics
arXiv:1707.05134 · doi:10.1021/acsphotonics.7b00538
Abstract
We explore theoretically how nonlocal corrections in the description of the metal affect the strong coupling between excitons and plasmons in typical examples where nonlocal effects are anticipated to be strong, namely small metallic nanoparticles, thin metallic nanoshells or dimers with narrow separations, either coated with or encapsulating an excitonic layer. Through detailed simulations based on the generalised nonlocal optical response theory, which simultaneously accounts both for modal shifts due to screening and for surface-enhanced Landau damping, we show that, contrary to expectations, the influence of nonlocality is rather limited, as in most occasions the width of the Rabi splitting remains largely unaffected and the two hybrid modes are well distinguishable. We discuss how this behaviour can be understood in view of the popular coupled-harmonic-oscillator model, while we also provide analytic solutions based on Mie theory to describe the hybrid modes in the case of matryoshka-like single nanoparticles. Our analysis provides an answer to a so far open question, that of the influence of nonlocality on strong coupling, and is expected to facilitate the design and study of plexcitonic architectures with ultrafine geometrical details.
References in corpus (11)
- Strong coupling between surface plasmon polaritons and emitters
- Plasmons in nearly touching metallic nanoparticles: singular response in the limit of touching dimers
- Realizing strong light-matter interactions between single nanoparticle plasmons and molecular excitons at ambient conditions
- Nonlocal optical response in metallic nanostructures
- Resonance shifts and spill-out effects in self-consistent hydrodynamic nanoplasmonics
- Strong coupling of single emitters to surface plasmons
- Theory of the strong coupling between quantum emitters and propagating surface plasmons
- Surface plasmon in metallic nanoparticles: renormalization effects due to electron-hole excitations
- Landau damping of surface plasmons in metal nanostructures
- Nonlocal study of ultimate plasmon hybridization
- Nonlocal effects: relevance for the spontaneous emission rates of quantum emitters coupled to plasmonic structures