Contribution to the study of storage and surface conditions on the adhesive behavior of optical surfaces

Abstract

Surface properties can affect the efficiency and behavior of the optical material, so their improvement is more than desirable. One of the recommended solutions is thin films depositions. Thin films are important for applications in different fields, such as optical devices, environmental applications, telecommunications devices, energy storage devices, and so on. The deposition of thin layers should be successful in order to achieve the desired objectives. Indeed, adhesion and deposit quality are the essential factor for the judgment of a thin films. In this context, this thesis aims to study the effect of storage conditions and the surface quality of certain optical materials on the adhesion of thin films. For this purpose, tests have been carried out in the synthesis and deposition of thin films by sol -gel and chemical bath deposition (CBD), as well as the study of the adhesion behavior of Zinc Sulfide and Silica thin films deposited with different concentration: 20, 30 and 40% on optical substrates. The tests were carried out on substrates made of optical materials (mineral glass and polymer) for long-term storage in various solutions (CK and PEG). Surfaces were treated with several techniques (Optical interferometry, TIS,AFM….) Their surface roughness was measured and compared ,the prepared solutions were analyzed by FTIR, Raman and photoluminescence Spectroscopy. The results obtained are therefore large variances and therefore clear conclusions are not easily drawn. The storage effect of the optical materials and their surface roughness on the adhesion phenomenon and the spreading factor of the deposited thin layers are established.