Effects of chloride additives on the mechanical stability and environmental durability of porous MgF2 thin films

F. Schütz; K. Scheurell; G. Scholz; E. Kemnitz

doi:10.1117/12.2235992

26 September 2016 Effects of chloride additives on the mechanical stability and environmental durability of porous MgF₂ thin films

F. Schütz, K. Scheurell, G. Scholz, E. Kemnitz

Author Affiliations +

Proceedings Volume 9929, Nanostructured Thin Films IX; 992914 (2016) https://doi.org/10.1117/12.2235992
Event: SPIE Nanoscience + Engineering, 2016, San Diego, California, United States

Abstract

Porous antireflective thin films, prepared of nanoscopic MgF₂ sols, exhibit a low refraction index and are useful for various optical applications. Due to their porosity, film stability and durability suffer from mechanical abrasion and water solubility, respectively. Hence, we present approaches of improved mechanical stability of MgF₂ layers induced by chloride addition. Antireflective (AR) films were produced by dip-coating followed by thermal treatment. Afterwards, film stability and environmental durability was strained by crockmeter and water stability tests, respectively. In comparison to films prepared from chloride-free MgF₂ sols, chloride mingled sols form coatings with increased mechanical stability and a lower solubility.

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F. Schütz, K. Scheurell, G. Scholz, and E. Kemnitz "Effects of chloride additives on the mechanical stability and environmental durability of porous MgF₂ thin films", Proc. SPIE 9929, Nanostructured Thin Films IX, 992914 (26 September 2016); https://doi.org/10.1117/12.2235992

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