CARACTERIZACIÓN DEL ESPESOR DE PELÍCULAS DELGADAS DE NANOPARTÍCULAS DE ORO EMBEBIDAS EN TiO2 SOBRE PRÓTESIS DE TITANIO MEDIANTE INTERFEROMETRÍA LÁSER

Abstract

In this research the principles of wave optics are used to study a biomechanical structure coated with a nanostructured material. Thin films of titanium dioxide embedded with gold nanoparticles and deposited by sol-gel on a titanium prosthesis were studied. For the determination of its thickness, a Michelson interferometer is developed, which generates two overlapping beams from the same light source to make the measurement. The light beam interference creates a rings or bands pattern which responds to changes in the optical path of the beams. From this quality results that this is a high-precision device, since it works with wavelengths light used as a measurement standard. The device developed in this work, presents the sufficient rigidity to keep the piece in a position, without the presence significant deviations in its displacement, besides having the capability to measure thin films on pieces that are too robust to put into other devices, such as an atomic force microscopy. In the manufacture of the mechanism, at the beginning were implemented several prototypes until get a preliminary design. For the modeling were used tools as computer-aided design (CAD) for the device modeling, and then machined and assembled to shape the pieces of the final design of the interferometer. The interferometer system evaluation allowed us the possibilities of application in another kind of analysis and/or characterization of surfaces. The device works with a 488 nanometer wavelength laser light, which shows the ability to identify the morphology of surfaces with an accuracy of +244 nm on metallic flat faces with high reflectivity such as titanium prosthesis.