Low temperature processing of multilayer dielectrics mirrors by sol–gel method

Bragg mirrors (BM) based on TiOx and SiO2 layers were built on glass and PET substrates at operating wavelength in the visible region. The layers were processed by the sol–gel method at room temperature and dried in air for one hour at 100 °C (glass) and 70 °C (PET). At these deposition conditions, the refractive indices of the TiOx and SiO2 layers were 2 and 1.49, respectively. The BM were assembled in a multilayer stack of quarter-wave thickness of alternately high and low refractive index materials. We report the experimental and simulated optical reflection spectra of TiOx–SiO2 BM for different number of layers pairs.