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      Tunable Fresnel lens using nanoscale polymer-dispersed liquid crystals

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      Applied Physics Letters
      AIP Publishing

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          Electrically switchable volume gratings in polymer‐dispersed liquid crystals

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            Liquid-crystal adaptive lenses with modal control.

            We report on a novel approach to the realization of nematic liquid-crystal (LC) phase correctors to form spherical and cylindrical wave fronts. A LC cell with a distributed reactive electrical impedance was driven by an ac voltage applied to the cell boundary to yield the desired spatial distribution of the refractive index. The two-dimensional function of the phase delay introduced into the light beam depends on the frequency of the ac control voltage, the geometry of the boundary electrode surrounding the LC cell, and the electrical parameters of the cell. We realized a cylindrical adaptive lens with a clear aperture of 15 mm x 4mm and a spherical adaptive lens with circular aperture of 6.5 mm. Both devices are capable of focusing collimated light in the range infinity...0.5 m.
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              Electrically controlled polarization-independent liquid-crystal Fresnel lens arrays.

              We describe the properties and construction of a polarization-independent Fresnel lens array using nematic liquid crystals in which the diffraction efficiency of lenses can be electrically controlled. A novel structure is used such that the principal axis of the liquid crystals in two adjacent zones of each Fresnel lens are orthogonal. This makes the device polarization independent. We have characterized these lenses at different applied fields and input polarizations by diffracting an argon-ion beam into focus.
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                Author and article information

                Journal
                Applied Physics Letters
                Appl. Phys. Lett.
                AIP Publishing
                0003-6951
                1077-3118
                August 25 2003
                August 25 2003
                : 83
                : 8
                : 1515-1517
                Article
                10.1063/1.1604943
                46f678d6-3c38-446f-a26e-51b3acc456d8
                © 2003
                History

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