Preparation of broadband antireflective coating by sol-gel method
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摘要:
A sol-gel method for the preparation of silica coating that varied in refractive index is developed.Silicon dioxide sol is obtained by hydrolysis and co-condensation reactions occurred in acid-catalyzed system.Surface morphology,refractive index,and transmission spectrum of the samples are studied.The results of transmission spectra of single-sided coatings show that the average transmittance of the samples increases about 4% compared with the uncoated one in the spectra range from 400 to 1 200 nm in the case of vertical incidence.For the double-sided coating the maximum transmittance is 99% at the wavelength of 840 nm.