研究目的
To study the nonlinear optical (NLO) properties of the NLC, doped with SWCNTs as a function of concentration of CNT by Z-scan method and to investigate the effect of electric field on the third order NLO coefficient.
研究成果
The presence of SWCNTs improves the NLO properties like NLA, NLR and ??(3) of the pristine nematic LC remarkably. The optimum concentration of the CNTs in the E5CN7 is 0.5 % wt. that improves the electro-optical properties. The NLO responses were improved under electric field.
研究不足
The study is limited to the effects of SWCNT doping and external electric field on the NLO properties of NLCs, specifically E5CN7, and does not explore other types of liquid crystals or dopants.
1：Experimental Design and Method Selection
The third order NLO properties were determined by using Z-scan techniques with a continuous wave (CW) He: Ne laser at 632.8 nm.
2：Sample Selection and Data Sources
The NLC substance used was an eutectic nematic mixture, E5CN7, doped with varying concentration (0-1 % wt.) of single walled carbon nanotubes (SWCNTs).
3：List of Experimental Equipment and Materials
Continuous wave (CW) He: Ne laser at 632.8 nm, digital power meter (Lab Master, Coherent), poly vinyl alcohol (PVA), indium tin oxide (ITO) covered glass substrates, SWCNTs.
4：Experimental Procedures and Operational Workflow
The cells were built from pairs of glass substrates with ITO covered inner surfaces, separated with 25 μm spacer. The mixtures were introduced between the cell walls using capillary forces. The Z-scan experiments were executed using the laser centered by an 80 mm focal length lens.
5：Data Analysis Methods
The nonlinear susceptibility, nonlinear refraction (NLR) and nonlinear absorption (NLA) were determined from the Z-scan data.
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