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Enhanced Optical Properties of Titania Nanolayers
Yahya Bougdid1,2, Aravinda Kar1, Ranganathan Kumar2
1Center for Research and Education in Optics and Lasers (CREOL), The College of Optics and Photonics, University of Central Florida, Orlando, Florida 32816, United States.
Langmuir : the ACS Journal of Surfaces and Colloids
|April 9, 2026
Summary
Laser processing optimizes titanium dioxide (TiO2) coatings for superior optical performance. This method offers precise control over film properties, enhancing transmittance and reflectance for photonic applications.
Area of Science:
- Materials Science
- Optics
- Nanotechnology
Background:
- Titanium dioxide (TiO2) coatings are crucial for optical applications.
- Optimizing TiO2 coatings requires precise control over crystallinity and optical properties.
- Conventional methods for TiO2 coating optimization can be limited.
Purpose of the Study:
- To investigate CO2 laser sintering as a method for optimizing TiO2 coatings on quartz substrates.
- To explore the impact of TiO2 concentration and laser power on film properties and optical performance.
- To provide insights for developing high-performance TiO2 coatings for photonic devices.
Main Methods:
- TiO2 films were deposited using spin-coating.
- Solvent evaporation was followed by CO2 laser sintering.
- A heat conduction model guided the laser sintering process.
- Optical properties were characterized using UV-vis dispersion and an effective medium approach.
Main Results:
- Laser sintering achieved high transmittance (>90%) and low reflectance (<5.5%).
- TiO2 concentration precisely controlled film thickness, porosity, and optical properties.
- Increased nanoparticle content reduced porosity and enhanced the refractive index.
- Higher laser power improved nanoparticle coalescence and bonding, reducing reflectance.
Conclusions:
- CO2 laser sintering is an efficient strategy for optimizing TiO2 coatings.
- Composition and porosity control are critical for tailoring optical characteristics.
- The findings offer valuable insights for photonic applications requiring high-performance TiO2 coatings.
