Effect of gamma-rays irradiation on wettability of sol–gel silica nanofilms

Abstract

Silica nanofilms are often used as antireflection films due to their unique optical properties. In the national high-power laser systems, in order to reduce optical reflection, the silica films are covered on the final optical components. However, the gamma radiation generated during the operation of these systems alters the properties of the silica films on the optical components. While wettability serves as the cornerstone of dust and pollution prevention in engineering technology, it has garnered limited attention in the research of optical components for high-power laser devices. Hence, this paper delves into the surface wettability and intricate hydrodynamics of droplets on silica films, both before and after gamma ray irradiation. The findings reveal that as the irradiation dose increases, the surface energy of the silica film rises, rendering it more lyophilic. By analyzing the impact dynamics of droplets on the silica thin film, we conclude that gamma irradiation renders the silica film coating on optical element surfaces more susceptible to contamination.