Abstract

Standard antireflective coatings applied to hard substrates like sapphire suffer from poor abrasion resistance. Silica is used as low refractive index layer in many multilayer systems although it has a lower hardness than the substrate. In this work an attempt was made to enhance the hardness by the addition of alumina. Magnetron sputtering was used in two different ways because it delivers dense coatings with high durability. Nanoindention hardness measurements of mixed alumina–silica films are presented in comparison to haze measurements after a sand trickling test. The hardness of silica is unexpectedly lowered by the addition of small amounts of alumina. Two different stacks were coated in which the low refractive index layers were sputtered as pure material and material mixtures. The thickness loss results after an oscillation abrasion test are presented.

© 2014 Optical Society of America

Full Article  |  PDF Article
More Like This
Optical properties of silicon titanium oxide mixtures prepared by metallic mode reactive sputtering

Daniel Rademacher, Günter Bräuer, Benjamin Fritz, and Michael Vergöhl
Appl. Opt. 51(33) 8047-8051 (2012)

Optical properties and environmental stability of oxide coatings deposited by reactive sputtering

Samad M. Edlou, Ali Smajkiewicz, and Ghanim A. Al-Jumaily
Appl. Opt. 32(28) 5601-5605 (1993)

Characterization of zirconia– and niobia–silica mixture coatings produced by ion-beam sputtering

Andrius Melninkaitis, Tomas Tolenis, Lina Mažulė, Julius Mirauskas, Valdas Sirutkaitis, Benoit Mangote, Xinghai Fu, Myriam Zerrad, Laurent Gallais, Mireille Commandré, Simonas Kičas, and Ramutis Drazdys
Appl. Opt. 50(9) C188-C196 (2011)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (7)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription