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Transient Properties During Positive-Negative Switching of Liquid Crystal Lens

The properties of a liquid crystal lens with two thin liquid crystal layers are studied. By using two-voltage driving approach, the focus range is expanded by driving the liquid crystal cell working as not only a positive lens but also a negative lens. The evolution of the lens power during the switching between the positive and negative lenses is observed. The switching becomes fast when thin liquid crystal layers are used.