2003
DOI: 10.1364/oe.11.003080
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Switchable Fresnel lens using polymer-stabilized liquid crystals

Abstract: A switchable Fresnel zone plate lens is demonstrated using a polymer-stabilized liquid crystal. The fabrication process is relatively simple and the device can be operated below 10 volts with fast response time. Such a device works well for a linearly polarized light.

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Cited by 121 publications
(68 citation statements)
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“…In this case the focusing behavior deteriorates because the LC orientation is unstable in the center region between the electrodes, due to the reverse tilt distribution of the LC director. To utilize fringe-field distribution, the fill factor of the LC microlens array is also highly limited [12][13][14]. Another approach to a switchable lens is to use a planoconvex reactive mesogen (RM) lens array on a planoconcave isotropic lens template.…”
Section: Introductionmentioning
confidence: 99%
“…In this case the focusing behavior deteriorates because the LC orientation is unstable in the center region between the electrodes, due to the reverse tilt distribution of the LC director. To utilize fringe-field distribution, the fill factor of the LC microlens array is also highly limited [12][13][14]. Another approach to a switchable lens is to use a planoconvex reactive mesogen (RM) lens array on a planoconcave isotropic lens template.…”
Section: Introductionmentioning
confidence: 99%
“…That anisotropy, in the case of weak anchoring energy at domains' walls, could be controlled by external fields. Mechanical strength and easy controllable anisotropy of such media provide possibility of creation of plane LC monitor, microlenses with controllable focal distances [7], and so on. The simplest forms with the discussed properties are the diffraction gratings with periodical distribution of concentration and refractive index, which are produced with the help of interference pattern of two plain waves [8,9].…”
Section: Introductionmentioning
confidence: 99%
“…By means of an approximation for large focal lengths, the radii of the rings can satisfy the equation f/r n = r n /nλ (λ is the wavelength of light, n = 1, 2, 3, ...), and the radius of the nth zone (r n ) in a FZP lens is given by r n = n 1/2 r 1 . 19 Setting the focal length to ∼120 μm at an optical wavelength of 850 nm, the spacing and widths of the Fresnel zones were calculated with different n. Figure 1 shows the three-dimensional (3D) schematic diagram of the FZP geometry and its operation. The radius of the central zones was 10 μm, and the lens radius was about 49 μm.…”
mentioning
confidence: 99%