Visible Optical Limiting Property of Germano-Silicate Glass Fibers with Au Nanoparticles Incorporated

Investigating with a continuous-wave 488-nm argon-ion laser, we rstly report on the visible optical limiting properties of germano-silicate optical bers with gold nanoparticles incorporated. The ground-state conduction, the surface plasmon band and the free carrier band were considered as a three-level model to theoretically explain the obtained optical limiting behaviors. In the visible wavelength region around the surface plasmon resonance absorption peak of the gold nanoparticles, the e ective nonlinear absorption coe cient was estimated to be 22.4 cm/GW.