Disordered antireflective subwavelength structures using Ag nanoparticles on fused silica windows

Area of Science:

• Materials Science
• Nanotechnology
• Optics

Background:

• Subwavelength structures are crucial for advanced optical applications.
• Fabricating these structures often requires high temperatures and complex processes.
• Developing low-temperature fabrication methods is essential for cost-effectiveness and material compatibility.

Purpose of the Study:

• To demonstrate an effective low-temperature method for fabricating disordered subwavelength structures (d-SWSs).
• To investigate the impact of fabrication parameters on antireflective properties.
• To evaluate the optical and thermal stability of the fabricated structures.

Main Methods:

• Fabrication of d-SWSs on fused silica using thermally dewetted silver (Ag) nanoparticles at <300°C under vacuum.
• Theoretical investigation using rigorous coupled-wave analysis (RCWA).
• Experimental characterization of optical transmission and thermal stability.

Main Results:

• Achieved high average optical transmission (T(ave)∼95.6%) from 500-1300 nm for a 10-nm Ag film.
• Observed a maximum transmission of ∼96% at 850 nm.
• Demonstrated excellent optical and thermal stability up to 1000°C, outperforming conventional coatings.

Conclusions:

• The developed low-temperature method effectively produces d-SWSs with superior antireflective properties.
• The fabricated d-SWSs offer significant advantages in terms of optical performance and thermal durability.
• This technique presents a promising alternative to traditional multilayer coatings for optical applications.