Fabrication of Multilayersthin Films and Determination of their Optical Prospectiveusing Different Lasers

Abstract

This work aimed to fabricate multilayers thin films by liquiddeposition and to determin their optical properties.Three dyes were used for this aim; Phenexazon, Rohadamine and Coumarin. Five samples were made fromthese dyes. The thickness of the thin film was deduced from the interference fringes made by He – Ne laser incident on the film during deposition. Sample one was made of three layers, thefirst one was Phenexazon andthesecond wasRohadamine and the third wasCoumarin.The thickness of each layer was equal to half the wavelength of He-Ne laser. Sample two was made of three layers; the first one was Phenexazon, the second was Rohadamine, they have same thickness equal to half the wavelength of Helium-Neon laser,while the third layer wasCoumarin with thickness equalto the wavelength of He-Ne laser. Sample three was made of three layers, the first was phenexazonwiththickness equal half the wavelength of He-Ne laser, the second was Rohdamine with thickness equal the wavelength of He-Ne laser, and the last layer was Coumarin, with thickness equal half the wavelength of He-Ne laser . Sample four was made of three layers;the first wasPhenexazonwith thickness equal the wavelength of He-Ne laser and the secondwas Rohdamine,while thethird one was Coumarin. The thickness of each layer was equal half the wavelength of He-Ne laser. Sample five was made of threelayers;the first one was Phenexazon, the second was Rohdamine, thethird was Coumarin. The thickness of each layerwas equal to the wavelength of He-Ne laser. The optical properties of the fabricated thin films were deduced from the transmission spectrum recordedusing different lasers with many wavelengths in the range between 500 – 950 nm. The transmission spectrum for each thin film was recorded, and then the absorption coefficient, the refractive index, the transmission and the reflectivity for each fabricated thin film were determined and compared with the other thin films. The results of the optical properties showed that some of the fabricated thin films can be used as reflectors or filtersin certain spectral range. At the end of this some recommendations were presented as future work.