Paper 13354-27
Paper 13354-27
Microstructural and optical properties of transparent thick films deposited by using TiO2 nanoparticles and CO2 laser (Invited Paper)
29 January 2025 • 1:50 PM - 2:15 PM PST | Moscone Center, Room 201 (Level 2 South)
Abstract
A CO2 laser additive manufacturing technique for depositing transparent thick TiO2 films on quartz substrates is reported. Thick TiO2 films are prepared in three stages, i.e., wet deposition using the spin-coating technique, evaporation of liquid using a lamp, and CO2 laser-assisted sintering of nanoparticles (NPs) to form a transparent film. A heat transfer model is presented for laser processing parameter selection. Different concentrations of anatase TiO2 suspensions are used to control the thickness and adjust the optical properties. SEM revealed that the absorbed CO2 laser energy promotes the formation of necking and coalescence between TiO2 NPs. A transmittance above ~85% can be achieved in some visible and IR ranges. A minimum reflectance can be achieved by controlling the sintering power and TiO2 concentration. The effect of laser power on morphological and optical properties is reported. The effects of TiO2 concentration on the refraction and absorption indices are investigated. Raman analysis is carried out to give a better insight into film microstructures. XRD analysis revealed that the sintered films are preserved as anatase TiO2.
Presenter
CREOL, The College of Optics and Photonics, Univ. of Central Florida (United States)
Yahya Bougdid, Ph.D. in Optics and Photonics, is currently working as a postdoctoral researcher at CREOL, The College of Optics and Photonics, and Department of Electrical and Computer Engineering, University of Central Florida, United States. He got his Ph.D. from Mohammed V University in Rabat, in collaboration with: MAScIR Foundation, and LaSIE, Osaka University, Osaka, Japan. His Ph.D. research was focused on two-photon (2PP) printing in photoresists combining nonlinear optics, materials science, and optical technology. He contributed to building 2PP laser nanofabrication technology in lithography and to work on such a technology in the African continent. His current research is focused on: Materials and Laser Micro-Nano-processing, Laser Sintering, Laser Doping of SiC for MWIR detectors, Laser-Assisted Nano-Electrospray Deposition of Nanoparticles (NPs), NPs Deposition for Solar Cell Applications, and Laser Deposition of Transparent TiO2 Films for Advanced Optics Applications.