Decision making two-wave mixing with rotating TiO<inf>2</inf>-supported Au-Pt nanoparticles

© 2019 Elsevier Ltd Mechano-optical rotating effects and their influence on the nonlinear optical properties exhibited by Au-Pt nanoparticles in a TiO2 thin solid film were analyzed. The plasmonic nanoparticles were prepared by a sol-gel processing route that involves TiO2 decoration. A vectorial two-wave mixing method with self-diffraction allowed us describing the third-order nonlinear optical response exhibited by a rotating sample during a polarization-resolved irradiation. A strong modification in the induced birefringence originated at 532 nm wavelength with nanosecond pulses was identified when the sample presents rotating motion. The absence of nonlinearity in the transmittance of a single-beam revealed that the optical Kerr effect in the nanostructures corresponds to the main mechanism responsible for the studied third-order nonlinear optical behavior. It was identified that the rotation of the sample can modulate self-diffraction signals in a two-wave mixing. An exclusive-or logic gate function was proposed by using a two-wave mixing configuration assisted by mechanical rotation of the sample. Potential applications of this technique can be contemplated for processing optical signals or quantum phenomena by combinational mechano-optical circuits.