Large diameter electrically tunable lens for ophthalmic distance accommodation.

Electrically tunable liquid crystal lens with 30 mm diameter is presented based on the refractive Fresnel concept. Relatively large optical power variation range (from - 0.74 to +0.

Dynamic beam shaping for LED lighting.

We describe an electrically tunable liquid crystal microlens array with a 65 mm clear aperture that allows the dynamic symmetric broadening of white light without mechanical movements. The fundamental mechanism of broadening is demonstrated to involve a spatial twist of molecular orientation. Continuous variations of the light divergence angle are obtained in a very large dynamic range (from 8° to 50°).

Modulation transfer function of liquid crystal microlenses and microprisms using double dielectric layer.

We investigate electrically tunable liquid crystal (LC) microlenses and microprisms based on double dielectric optically hidden (DDOH) layers. Comparative theoretical study of the spatial resolution limits in the creation of a spatially modulated electric field by the DDOH layer is conducted. Both the depth of the resulting optical phase modulation and its deviation from the desired wavefront are obtained for sine and sawtooth geometries of the DDOH layer's structure.

Theoretical analyses of a liquid crystal adaptive lens with optically hidden dielectric double layer.

In this work we theoretically analyze the performance trends of a liquid crystal lens based on the optically hidden dielectric double layer principle. We demonstrate possible ways to optimize the lens as a function of the material and geometric parameters used. The impact of relative dielectric constants, conductivities, and dimensions of the components of the hidden dielectric layer, as well as the thickness and the temperature of the liquid crystal material, are demonstrated.

Electrically variable liquid crystal lens based on the dielectric dividing principle.

Theoretical modeling is performed for a liquid crystal (LC) lens that uses a combination of two dielectric lenses and voltage dividing principle to shape the electric field in space. Electric field, LC reorientation, and optical phase retardation profiles are obtained by numerical simulations. The obtained results are compared with experimental ones, and good agreement is obtained validating the proposed two-dimensional model that uses a limited number of dielectric and geometrical control parameters for this type of lens.