Visible optical limiting property of germano-silicate glass fibers with Au nanoparticles incorporated

Abstract

Investigating with a continuous-wave 488-nm argon-ion laser, we firstly report on the visible optical limiting properties of germano-silicate optical fibers 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 effective nonlinear absorption coefficient was estimated to be 22.4 cm/GW.