Mertin, Stefan and Marot, Laurent and Sandu, Cosmin S. and Steiner, Roland and Scartezzini, Jean-Louis and Muralt, Paul. (2015) Nanocrystalline Low-Refractive Magnesium Fluoride Films Deposited by Reactive Magnetron Sputtering: Optical and Structural Properties. Advanced Engineering Materials, 17 (11). pp. 1652-1659.
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Official URL: https://edoc.unibas.ch/94793/
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Abstract
In this work, we study MgF 2 thin-film synthesis by reactive pulsed DC magnetron sputtering from a metallic magnesium target in a gas mixture of argon, oxygen, and carbon tetrafluoride (CF 4 ). Nanocrystalline films on silicon and glass substrates with excellent properties for optical application are achieved. The plasma discharge is analyzed with a differentially pumped mass spectrometer before and during the deposition process. Without breaking the vacuum, monochromatic photoelectron spectroscopy (XPS) is performed for in situ determination of the atomic C and O concentration. Film microstructure, topography, and thickness are investigated by electron microscopy (SEM and TEM), atomic force microscopy (AFM), and X-ray diffraction (XRD). The optical constants n and k are determined by spectroscopic ellipsometry and spectrophotometry: a consistent parametric fit of the ellipsometric angles and spectral transmittance and reflectance based on three Lorentz oscillators to determine n and k is achieved for a wide spectral range (300-2 300 nm). At 550 nm, a refractive index of 1.382 and near-zero absorption is obtained, which is in excellent agreement with n = 1.383 of polycrystalline MgF 2 . The measured light reflection at 760 nm is reduced by 3% for a quarter-wave nanocrystalline MgF 2 coating on glass compared to the uncoated glass substrate.
Faculties and Departments: | 05 Faculty of Science > Departement Physik > Physik > Nanomechanik (Meyer) |
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UniBasel Contributors: | Marot, Laurent |
Item Type: | Article, refereed |
Article Subtype: | Research Article |
Publisher: | Wiley |
ISSN: | 1438-1656 |
e-ISSN: | 1527-2648 |
Note: | Publication type according to Uni Basel Research Database: Journal article |
Identification Number: | |
Last Modified: | 12 Jun 2023 14:31 |
Deposited On: | 12 Jun 2023 14:31 |
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