title: Plasmon-photon conversion to near-infrared emission from Yb(3+): (Au/Ag-nanoparticles) in tungsten-tellurite glasses.
abstract: This manuscript reports on the interaction between (2)F5/2→(2)F7/2 radiative transition from Yb(3+) ions and localized surface plasmon resonance (from gold/silver nanoparticles) in a tungsten-tellurite glass. Such an interaction, similar to the down-conversion process, results in the Yb(3+) emission in the near-infrared region via resonant and non-resonant energy transfers. We associated such effects with the dynamic coupling described by the variations generated by the Hamiltonian HDC in either the oscillator strength, or the local crystal field, i.e. the line shape changes in the emission band. Here, the Yb(3+) ions emission is achieved through plasmon-photon coupling, observable as an enhancement or quenching in the luminescence spectra. Metallic nanoparticles have light-collecting capability in the visible spectrum and can accumulate almost all the photon energy on a nanoscale, which enable the excitation and emission of the Yb(3+) ions in the near-infrared region. This plasmon-photon conversion was evaluated from the cavity's quality factor (Q) and the coupling (g) between the nanoparticles and the Yb(3+) ions. We have found samples of low-quality cavities and strong coupling between the nanoparticles and the Yb(3+) ions. Our research can be extended towards the understanding of new plasmon-photon converters obtained from interactions between rare-earth ions and localized surface plasmon resonance.
authors.affiliation: Instituto de Física de São Carlos, Universidade de São Paulo (USP), São Carlos (SP), 13560-970, Brazil.|Center for Optics, Photonics and Laser (COPL), Université Laval, Quebec (Qc), G1V 0A6, Canada.
authors.forename: V A G
authors.initials: VA
authors.lastname: Rivera
authors.affiliation: Center for Optics, Photonics and Laser (COPL), Université Laval, Quebec (Qc), G1V 0A6, Canada.
authors.forename: Yannick
authors.initials: Y
authors.lastname: Ledemi
authors.affiliation: Instituto de Física de São Carlos, Universidade de São Paulo (USP), São Carlos (SP), 13560-970, Brazil.|Centro Universitário Central Paulista (UNICEP), São Carlos (SP), 13563-470, Brazil.
authors.forename: Marcelo A
authors.initials: MA
authors.lastname: Pereira-da-Silva
authors.affiliation: Center for Optics, Photonics and Laser (COPL), Université Laval, Quebec (Qc), G1V 0A6, Canada.
authors.forename: Younes
authors.initials: Y
authors.lastname: Messaddeq
authors.affiliation: Instituto de Física de São Carlos, Universidade de São Paulo (USP), São Carlos (SP), 13560-970, Brazil.
authors.forename: Euclydes
authors.initials: E
authors.lastname: Marega