Optical filters have received much attention currently due to the increasing demand in various applications. Spectral filters block specific wavelengths or ranges of wavelengths and transmit the rest of the spectrum. This paper reports on the simulated TiO2 – SiO2 optical filters. The design utilizes a high refractive index TiO2 thin films which were fabricated using spray Pyrolysis technique and low refractive index SiO2 obtained theoretically. The refractive index and extinction coefficient of the fabricated TiO2 thin films were extracted by simulation based on the best fit. This data was then used to design a five alternating layer stack which resulted into band pass with notch filters. The number of band passes and notches increase with the increase of individual layer thickness in the stack.
Kitui, M.; M Mwamburi, M.; Gaitho, F.; and M. Maghanga, C.
"Optical Properties of TiO2 Based Multilayer Thin Films: Application to Optical Filters.,"
International Journal of Thin Film Science and Technology: Vol. 4
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Available at: https://digitalcommons.aaru.edu.jo/ijtfst/vol4/iss1/1