Abstract
We report the creation and the use of dual frequency cholesteric liquid crystal mixtures for the dynamic electrical unwinding and forced (accelerated) restoring of their molecular helix. The use of a cholesteric in a mixture with a dual frequency nematic shifts the resonant wavelength to the near infrared area. We use polarimetric transmission measurements (out of resonance) to check the effective birefringence of the cell as well as the resonant reflection (at near infra red) to characterize the dynamics of unwinding and restoring processes. The restoring process is accelerated almost by an order of magnitude for quite moderate voltages used.
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