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Name of experiment：application of power amplifier in the influence of electric field frequency on the temperature domain and electro-optical properties of driving blue-phase liquid crystal

Research direction：research on electro-optical properties

Experimental equipment：chemicals, arbitrary function generator, ATA-4051 power amplifier, precision impedance analyzer, etc.

Experimental purpose：blue phase (BP) has attracted extensive attention due to its unique 3D self-assembly structure and excellent electro-optical properties, and has a broad application prospect in the field of fast light modulator or tunable photonic crystal.

Experimental process：

（1）Synthesis and characterization of dual-frequency liquid crystals

The crude product was purified by silica gel chromatography column, dichloromethane was selected as the eluent, and the final product was white powder after drying

（2）Preparation of liquid crystal box

Polyethylene terephthalate (PET) film is used as the spacer pad for the liquid crystal cell, eliminating the need to use a surface oriented layer. In the isotropic state, LC was filled into the liquid crystal cell by capillary action, and the tissue transmission was observed by applying electric fields of different frequencies.

（3）The generators of electric fields of different frequencies are arbitrary function generators and power amplifiers (ATA-4051).

The permittivity and frequency response of liquid crystal were measured by precision impedance analyzer, and the parallel and vertical permittivity were measured by vertical and parallel orientated liquid crystal cells respectively.

Result of experiment：

（1）Phase behavior of dual-frequency liquid crystals

DSC curve of DFLC

polarizing light during the heating process 

（2）Frequency response of dual-frequency blue-phase liquid crystals

Polarizing photos of DF-BPLC under different electric fields (no electric field /50 Hz/50 kHz) : cholesteric phase (a), blue phase (b), reentry cholesteric phase (c) and temperature domain (d).

Amplifier's role in this experiment：amplify the signal to form an electric field of different frequencies to observe the resulting tissue transmission