Optical properties of EDF codoped with Au nanoparticles

We report on the luminescent enhancement of the $Er^{3+}$ -doped germano-silicate fibers by the incorporation of Au nanoparticles in the core of the fibers. The absorption peak appeared at 498.4nm was found due to the surface plasmon resonance of Au nanoparticles. The incorporated Au nanoparticles were found to be effective absorbents for hydroxyl groups to enhance the luminescence of $Er^{3+}$ ions when pumped with the 980nm laser diode.