Damage behavior of HfO 2 monolayer film containing gold nanoparticles as artificial absorbing defects

Abstract

Hafnia is one of the most utilized high-index materials in thin-film multilayer coatings for high-power lasers. It is well established that in the 2 2HfO SiO multilayers for 351 nm, nanosecond-pulse applications the damage is driven by the nanoscale absorbers localized in the hafnia layers. In this work, damage-crater formation thresholds and morphology are investigated for the undoped HfO 2 monolayer films and films containing isolated gold nanoparticles of 2-and 5-nm average diameter. Atomic force microscopy is used for characterization of the damage craters produced by 351-nm, 0.5-ns laser pulses. This comparative study of crater-geometry variation with laser fluence for doped and undoped films allowed the estimation of properties of the intrinsic absorbing defects in the hafnia films.

Effect of laser conditioning on nanoprecursor for improving laser damage resistance of HfO2coatings

“…Therefore, it is very important to identify the damage defects and to study the characteristics of the damage. Some effort has been made to identify and characterize defects that limit the critical incident fluence [2], and many articles have reported that nano-gold particles were embedded in HfO 2 film to simulate the damage characteristics of nanoabsorbers and indicated that the most likely nanoabsorbers were localized Hf clusters [12].…”