26 September 2016 Effects of chloride additives on the mechanical stability and environmental durability of porous MgF2 thin films
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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, F. Schütz, K. Scheurell, K. Scheurell, G. Scholz, G. Scholz, E. Kemnitz, 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); doi: 10.1117/12.2235992; https://doi.org/10.1117/12.2235992
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