TiO(2)-SiO(2) mixed films prepared by the fast alternating sputter method

Area of Science:

• Materials Science
• Thin Film Deposition
• Optical Coatings

Background:

• Titanium dioxide (TiO2) and silicon dioxide (SiO2) are widely used in optical coatings.
• Achieving homogeneous mixing of dissimilar materials in thin films is challenging.
• Existing deposition methods can result in layered structures rather than true mixtures.

Purpose of the Study:

• To introduce and evaluate the fast alternating sputter (FAS) method for depositing TiO2-SiO2 mixed films.
• To investigate the structural and optical properties of FAS-deposited TiO2-SiO2 films.
• To demonstrate the capability of FAS for creating amorphous, fully mixed thin films.

Main Methods:

• Utilized the fast alternating sputter (FAS) technique for co-deposition of TiO2 and SiO2.
• Analyzed film structure using X-ray diffraction (XRD) to identify phase composition and crystallinity.
• Characterized optical properties across the visible and near-infrared spectrum.

Main Results:

• The FAS method resulted in completely mixed TiO2-SiO2 films, with no layered structure observed via XRD.
• The mixed films maintained an amorphous structure over a broad compositional range.
• Optical properties shifted from SiO2-dominant to TiO2-dominant with increasing TiO2 content.

Conclusions:

• Fast alternating sputter is an effective method for producing homogeneous, amorphous TiO2-SiO2 mixed films.
• The FAS technique offers precise control over film composition and optical properties.
• This method has potential applications in advanced optical coatings and material design.