Silver-based composite multilayer for ultraviolet transmittance and heat insulation design and its optical properties

A couple of multilayer structures for ultraviolet (UV) transmittance and heat insulation were designed and fabricated in terms of the induced transmittance theorem of metal films after a comprehensive analysis on materials band structure and internal photoelectric effects. The multilayer shows excellent near UV transmittance and IR reflectivity and it can be applied in UV curing for heat insulation and quality improvement. The peak value of UV transmittance at 365 nm is about 80% and the IR reflectivity at 1600 nm is over 90% in the optimized structure. This multilayer system is deposited with amorphous TiO₂ and Ag alternately by conventional evaporation. The effect of multilayer structure on optical properties was investigated. The spectroscopic ellipsometry (SE) analysis indicates that the interface of Ag/TiO₂ is sharp without transition layer and interface reaction.