Plessen, G.V.G.V.PlessenFischer, S.S.FischerHallermann, F.F.HallermannKumar, D.D.KumarSprafke, A.A.SprafkeGoldschmidt, Jan ChristophJan ChristophGoldschmidt2022-03-122022-03-122012https://publica.fraunhofer.de/handle/publica/38982610.1364/PV.2012.PW2B.22-s2.0-84893474455Upconversion of sub-bandgap photons has been suggested to increase the efficiencies of silicon solar cells. Here we use model calculations to study the potential of optical near-field effects in gold nanoparticles to enhance the upconversion intensities from erbium ions. The results indicate that upconversion can be enhanced in a geometry relevant for applications.enconference paper