Abstract
AbstractA novel light‐focus device was fabricated and demonstrated. The device consists of two glass substrates and one liquid crystal (LC) layer. Each indium tin oxide electrode coated on the two inner substrate surfaces of the device was etched into Fresnel zone patterns. In field‐off state, the transmission is uniform and light is not focused. In field‐on state, a 2π phase difference between adjacent zones can be adjusted. Then the device becomes a Fresnel phase zone plate and acts as a lens. Moreover, for getting transmission independent of light polarization direction, the LC layer was treated by twist of 180° along the normal of substrate surfaces.
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