Optical Properties of Synthesized Fe₃O₄ Nanoparticles Doped in Nematic Liquid Crystal under Electric Field

Abstract:

The average particle size of synthesized 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 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% W/W). 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 nps in homogeneous alignment samples and do not have any significant affect in homeotropic alignment samples.

• Periodical: Advanced Materials Research (Volume 829)
• Pages: 836-840
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.829.836
• Online since: November 2013
• Authors: Zahra Dehghani, Esmaiel Saievar Iranizad*, Abbas Faraji Alamouti, Marzieh Nadafan
• Keywords: Alignment, Electric Field, Fe₃O₄ Nanoparticles, Nematic Liquid Crystal, NONLINEAR OPTICS, Z-Scan Technique

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