| Advancements in Visible Reflection Coatings: Innovations
in Dielectric and Nanostructured Thin Films for Photonic
and Optoelectronic Applications |
Venkatesh Yepuria,* and Allaka Gopichandb
Pages : 1-7
DOI: 10.1080/0371750X.2026.2615762 |
| Abstract |
| This study reports the fabrication of TiO2
/SiO2 multilayer coatings via sol-gel spin coating, optimized for high visible light reflectance and hydrophilic functionality. X-ray diffraction confirmed the formation of anatase-phase TiO2 with a dominant (101) peak at 25o-27o, while Fourier-transform infrared spectroscopy revealed
strong Si-O-Ti bonding, indicative of robust interfacial adhesion. Cross-sectional FESEM imaging demonstrated a well-defined multilayer stack with measured individual layer thicknesses of 136.8, 147.8, 268.0, 300.8 and 169.5 nm, giving a total thickness of 1.02 m and ensuring precise thickness uniformity for constructive interference. Optical characterization showed a reflectance exceeding 90% in the 500-600 nm region with complementary transmission suppression, validating the multilayer as an efficient dielectric reflector. Contact angle measurements yielded 45o±2o
, confirming hydrophilic surface behaviour beneficial for self-cleaning
applications. The combination of broadband reflectance, structural integrity and surface wettability highlights the multifunctional potential of the TiO2/SiO2 multilayer for photonic and optoelectronic applications, including dielectric mirrors, optical filters, waveguides, augmented reality displays and self-cleaning solar panels. The scalable sol-gel spin-coating approach establishes a promising route toward low-cost, energy-efficient optical coatings for next-generation devices. |
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