Size dependent nonlinear optical properties of spin coated zinc oxide-polystyrene nanocomposite films

摘要: Abstract Using simple wet chemical method at room temperature, zinc oxide (ZnO) nanoparticles embedded in polystyrene (PS) matrix were synthesized. The size of the ZnO could be varied by varying precursor concentration, reaction time and stirring speed. Transparent films ZnO/PS nanocomposites thickness around 1 μm coated on ultrasonically cleaned glass substrates spin coating. optical absorptive nonlinearity nanocomposite was investigated using open aperture Z-scan technique with nanosecond laser pulses 532 nm. results indicate limiting type due to two-photon absorption ZnO. These also show a self-defocusing negative nonlinear refraction closed experiment. observed is strongly dependent particle normalized transmittance reduced as low 0.43 suitable choice nanoparticle size. composite can hence used efficient limiters for sensor protection. much-pronounced response these films, compared pure ZnO, combined improved stability PS offer prospects application fabrication stable non-linear devices.