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Abstract

Coupling is at the heart of plasmonics and its applications as it is one of the building blocks of nano-photonics engineering. Moreover, the interaction between surface plasmon resonances and quantum emitters is a key ingredient toward the coherent control of light emission at the nano-scale. In this chapter, we will investigate outstanding problem in surface-plasmon coupling physics. We will first focus on the coupling between two plasmonic resonators in a dimer configuration and show the remarkable spectral tuning of optical properties which can be achieved in these structures. Second, we will explore the coupling between two plasmon modes within a single nano-particle. We will see that the laws ruling this particular phenomenon of self-hybridization can be understood in terms of non-Hermitian effects. Then, we will study the coupling a plasmonic resonator and its substrate by combining numerical simulation with electron energy-loss and cathodoluminescence experiments. Eventually, we will study the weak coupling between plasmon modes of a silver nano-cube and excited states of neutral nitrogen-vacancy defects (NV0 centers) in nano-diamonds and - using light interferometry - evidence the presence of a Purcell enhancement effect.