研究目的
Investigation of reorientation properties of 8CB liquid crystal samples doped with gold nanorods with distinct aspect ratios.
研究成果
The addition of gold nanorods in twisted nematic samples modifies the electro-optical response of these systems, which can be exploited to the development optical devices with a faster response.
研究不足
The study focuses on the effects of gold nanorods on the reorientation dynamics of twisted nematic cells, but the contribution of surface plasmon resonance seems to be relevant only to nonlinear optical phenomena.
1：Experimental Design and Method Selection:
An optical experimental setup was used to probe the electro-optic response of twist cells under an AC electric field.
2：Sample Selection and Data Sources:
8CB liquid crystal samples doped with gold nanorods with distinct aspect ratios were used.
3：List of Experimental Equipment and Materials:
He-Ne laser beam (HNL020L, Thorlabs), arbitrary function generator (AFG1022, Tektronix), digital oscilloscope (TDS 2012B, Tektronix), Ocean Optics USB2000 UV-VIS spectrometer.
4：Experimental Procedures and Operational Workflow:
The transient intensity of a linearly polarized He-Ne laser beam during the Freedericksz transition in a twisted nematic sample was analyzed.
5：Data Analysis Methods:
The characteristic switch times and Freedericksz threshold of doped nematic liquid crystals were measured.
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arbitrary function generator
AFG1022
Tektronix
Produce a square-wave AC electric field
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digital oscilloscope
TDS 2012B
Tektronix
Record the transient intensities of s- and p-polarization components of the transmitted laser beam
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Ocean Optics USB2000 UV-VIS spectrometer
USB2000
Ocean Optics
Record transmission spectra
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He-Ne laser beam
HNL020L
Thorlabs
Probe the electro-optic response of twist cells
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