Optical properties of synthesized Fe3O4 nanoparticles doped in nematic liquid crystal under electric field

摘要

The average particle size of synthesized Fe_3O_4 nanoparticles (nps) was found to be about 34 nm as analyzed using scanning electron microscopy (SEM). The nonlinear optics measurements were performed by using z-scan method with 532 nm wavelength CW Nd:YAG laser. The influence of electric field on the nonlinear optical responses for nematic liquid crystals (NLCs) doped with Fe_3O_4 nps was considered in different voltages. The measurements were performed with ferronematics for two commonly initial alignments (homogeneous and homeotropic) with small compositional percentage of magnetic nps (i.e. 1% WAV). The experimental results show that the magnitudes of nonlinearity in homeotropic alignment samples are larger than homogeneous ones. Results show that the applied electric field had a great effect on the nonlinear optical properties of NLCs doped with Fe_3O_4 nps in homogeneous alignment samples and do not have any significant affect in homeotropic alignment samples.