Twisted light by a Kerr like TiO2 thin film with Au Pt nanoparticles
Third order nonlinear optical effects exhibited by Gold Platinum nanoparticles in a Titanium Dioxide thin solid film were induced by a two wave mixing configuration with digitally modulated irradiance profiles. The nanomaterials were prepared by a sol gel method, and a spinning coating technique was employed for the preparation of the samples in thin film form. We used a Nd:YAG laser system at 532 nm wavelength and 4 nanosecond for the exploration of the thirdorder optical nonlinearities. The characterization of the morphology and optical transmittance was carried out by transmission electronic microscopy and UV vis spectroscopy studies; respectively. A round continuously variable nonlinear refractive index was proposed to generate twisted light by nanosecond pulses in the sample. The system was designed with a randomly distributed density of the nanoparticles. This technique can be considered an alternative for performing ultrafast all optical instrumentation functions.
International Workshop on Thin Films for Electronics, Electro Optics, Energy and Sensors