Erratum: Plasmon enhanced upconversion luminescence near gold nanoparticles - simulation and analysis of the interactions (Optics Express (2012) 20 (271-282))

The procedure used in our previous publication [Opt. Express 20, 271, (2012)] to calculate how coupling to a spherical gold nanoparticle changes the upconversion luminescence of Er3+ ions contained several errors. The errors are corrected here.