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Surface plasmons enable the localization of light on nanoscale and provide an effective way of controlling the excitation and emission properties of quantum systems. The confinement of electromagnetic fields in regions as small as possible is important for diverse applications, such as nanophotonics, biosensing, biotechnology, medical imaging and others. In this sense, metallic nanostructures sustaining surface plasmons can change the excitation and emission properties of locally excited quantum systems, such as rare-earth ions resulting in an interaction plasmon-photon that enable new technologic applications. [ABSTRACT FROM AUTHOR]