Abstract
Fabrication and characterization of spectrally selective glazing dielectric multilayer structures
Highlights
A Bragg reflector is an optical component which is nothing but the multilayer structure of two alternating materials of distinct refractive index
Titanium Isopropoxide (TTIP) and Tetra Ethyl Ortho Silicate (TEOS) precursors procured by Sigma-Aldrich were used as the Ti and Si sources
Afterwards, 1 ml precursor TTIP/TEOS drop-wise was added under vigorous stirring while maintaining 2 min interval in order to prepare the TiO2/SiO2 solution
Summary
A Bragg reflector is an optical component which is nothing but the multilayer structure of two alternating materials of distinct refractive index. Other than dielectric materials such as zinc oxide, zirconium oxide, etc., the TiO2 and SiO2 are the best opted dielectric materials due to their high refractive index contrast and non-hazardous during the processing by the sol-gel method These materials have been demanded for their potential applications such as anti-reflection coating, optical waveguides, photonic crystals etc. Calvo et al introduced a synthetic route in fabricating Bragg mirrors with TiO2 thin-films by adopting the sol-gel spin coating [15] He prepared the visible reflector with six layers of TiO2-TiO2 with periodic variation of refractive index and controlled porosity. Hinczewski et al presented the preparation of optical filters based on SiO2 and TiO2 multi-layers by adopting the sol-gel spin coating technique [16].
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