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arXiv · 1904.09279

Plasmon-Emitter Interactions at the Nanoscale

P. A. D. Gonçalves·Thomas Christensen·Nicholas Rivera·Antti-Pekka Jauho·N. Asger Mortensen·Marin Soljačić
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Abstract

Plasmon-emitter interactions are of paramount importance in modern nanoplasmonics and are generally maximal at short emitter-surface separations. However, when the separation falls below 10-20 nm, the classical theory progressively deteriorates due to its neglect of quantum mechanical effects such as nonlocality, electronic spill-out, and Landau damping. Here, we show how this neglect can be remedied by presenting a unified theoretical treatment of mesoscopic electrodynamics grounded on the framework of Feibelman $d$-parameters. Crucially, our technique naturally incorporates nonclassical resonance shifts and surface-enabled Landau damping - a nonlocal damping effect - which have a dramatic impact on the amplitude and spectral distribution of plasmon-emitter interactions. We consider a broad array of plasmon-emitter interactions ranging from dipolar and multipolar spontaneous emission enhancement, to plasmon-assisted energy transfer and enhancement of two-photon transitions. The formalism presented here gives a complete account of both plasmons and plasmon-emitter interactions at the nanoscale, constituting a simple yet rigorous and general platform to incorporate nonclassical effects in plasmon-empowered nanophotonic phenomena.

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P. A. D. Gonçalves, Thomas Christensen, Nicholas Rivera, Antti-Pekka Jauho, N. Asger Mortensen, Marin Soljačić. 2019-04-19. Plasmon-Emitter Interactions at the Nanoscale. https://doi.org/10.1038/s41467-019-13820-z

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