Optical constants of rare-earth substituted amorphous oxide-mix-based layers deposited to enable synthesis of magneto-optic garnets

Document Type

Journal Article

Publication Title

Optical Materials

Publisher

Elsevier

School

Electron Science Research Institute / School of Science

RAS ID

30156

Funders

Electron Science Research Institute, Edith Cowan University.

Comments

Nur-E-Alam, M., Vasiliev, M., & Alameh, K. (2019). Optical constants of rare-earth substituted amorphous oxide-mix-based layers deposited to enable synthesis of magneto-optic garnets. Optical Materials, 98, Article 109309. Available here

Abstract

Amorphous oxide mixes used to synthesise ferrite-type rare-earth (RE) substituted garnets and garnet-oxide nanocomposite layers are prepared on clear glass substrates by using RF magnetron sputter-deposition process. By using a combination approach employing custom-built spectrum-fitting software in conjunction with Swanepoel's envelope method, the spectral dispersion function of optical constants and the layer thicknesses are derived accurately from the transmission spectra of the as-deposited samples. The effects of excess metal-oxides added to the base material systems during the co-deposition process are found to affect the refractive index and the optical absorption coefficients of garnet-oxide composites. A number of optical constant datasets are presented, enabling the experimentalists to design nanophotonic or integrated-optics devices employing these functional materials. The garnet compositions characterized (deposited by RF sputtering) have only been reported in annealed garnet layers till present, however, the optical constants of as-deposited films are also of interest for the design of magnetic multilayers.

DOI

10.1016/j.optmat.2019.109309

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