| Nonlinear Optical Properties of 5CB Nematic Liquid Crystal Doped of Synthesized of ZnS Nanoparticles |
| Paper ID : 1029-UFGNSM-FULL |
| Authors: |
|
Zahra Dehghani *1, Marzieh Nadafan2, Mohammad Hosein Majles Ara3 1P. O. Box 9319774400, I.R. Iran 2Department of Physics, Shahid Rajaee Teacher Training University, Tehran, Lavizan, P. O. Box 16788-15811, I.R. Iran 3Department of Physics, Kharazmi University, Tehran, P. O. Box 15719-14911, I.R. Iran |
| Abstract: |
| Recently the nonlinear effects of the different materials doped in nematic liquid crystals (NLCs) are more interesting. The addition of nanoparticles (NPs) can be improved the nonlinear optical (NLO) properties of the pure NLCs. In this research, ZnS NPs have been synthesized by hydrothermal method. These NPs were characterized structurally by XRD and found to have cubic structure with the diffraction peaks as (111), (220) and (311). From SEM image of these NPs have been found to be nearly spherical in shape and possess average size of 40 nm. Then, ZnS NPs with 1% wt. compositional percentage doped in 5CB NLCs. The linear absorption, α, of ZnS NPs in 5CB was obtained by optical limiting (OL) method. Afterwards, the nonlinear refractive (NLR) index, n2, and nonlinear absorption (NLA) coefficient, β of ZnS NPs in NLCs were measured using close and open aperture z-scan respectively by using a continues wave (CW) He: Ne laser at 632.8 nm wavelength. The measurements were performed for homeotropic initial alignments of NLCs molecules. Strong optical nonlinearity, self-defocusing and two photon absorption (TPA) effects are observed for ZnS NPs in NLCs by homeotropic alignments. A small compositional percentage of ZnS NPs, 1 % W/W, dispersing in a NLCs showed improved nonlinearity. |
| Keywords: |
| ZnS Nanoparticles, nematic liquid crystals , homeotropic alignments, nonlinear optical properties |
| Status : Paper Accepted (Poster Presentation) |
