Fabrication of multi-layer antireflection coating consisting of ZnS and MgF2

Document Type : Original Article

Authors

1 Thin Film Lab, Faculty of Physics, University of Semnan, Semnan, Islamic Republic of Iran

2 Education of Semnan province, Semnan, Iran

10.22075/ppam.2021.23357.1005

Abstract

In this study, Magnesium Fluoride (MgF2) and Zinc Sulfide (ZnS) multi-layer antireflection coatings were prepared using Glancing Angle Deposition (GLAD) technique. MgF2 and ZnS materials have been coated in a Hind - Hivac coating unit (model 15F) on glass substrates. Antireflection coatings were prepared at different oblique incident flux angles (α = 40°, 65°,70°, 80°) by the thermal evaporation method. The X-ray diffraction (XRD) analysis indicated that the thin films coated at different incident angles were crystallized in a single phase with an orthorhombic structure. The XRD results showed improvement of the film crystallinity upon grain size increment. Optical properties were investigated throughout the measurement of transmission spectra and refractive index and extinction in the visible region. The refractive index of films decreased from 2.83 to 2.13 as the flux angle increases from 40° to 80°. The extinction coefficient of films increased from 0.03849 to 0.05997 as the flux angle increases from 40° to 80°.

Keywords



Articles in Press, Accepted Manuscript
Available Online from 23 August 2021
  • Receive Date: 07 May 2021
  • Revise Date: 05 June 2021
  • Accept Date: 12 June 2021