Ultraviolet-transparent low-index layers for antireflective coatings

Area of Science:

• Materials Science
• Optics
• Thin Film Technology

Background:

• Nanostructured low-index layers are crucial for advanced antireflective (AR) coatings.
• These layers enhance spectral range and performance at oblique angles.
• Integrating AR coatings with interference stacks in a single vacuum process is desirable.

Purpose of the Study:

• To investigate uracil as a template for creating nanostructured low-index layers for AR coatings.
• To develop a method for producing inorganic interference stacks and low-index layers within the same vacuum process.
• To improve the environmental stability and ultraviolet transmission of AR coatings.

Main Methods:

• Evaporation of organic uracil layers.
• Plasma structuring of the organic layers.
• Additional plasma-treatment to reduce organic content.
• Fabrication of inorganic interference stacks and nanostructured low-index layers in a single vacuum process.

Main Results:

• Successful fabrication of nanostructured low-index layers using uracil templates.
• Plasma treatment significantly reduced the organic fraction of the coating.
• Achieved enhanced environmental stability.
• Demonstrated higher transmission in the ultraviolet range.

Conclusions:

• Plasma-structured uracil templates offer a viable route to nanostructured low-index layers for AR coatings.
• The integrated vacuum process enables efficient manufacturing of advanced optical coatings.
• The enhanced stability and UV transmission make these coatings suitable for demanding applications.