Switchable Fresnel lens using polymer-stabilized liquid crystals

Fan, Yun‐Hsing; Ren, Hongwen; Wu, Shin‐Tson

doi:10.1364/oe.11.003080

Cited by 121 publications

(68 citation statements)

References 11 publications

(14 reference 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%

Polarization-Dependent Microlens Array Using Reactive Mesogen Aligned by Top-Down Nanogrooves for Switchable Three-Dimensional Applications

Son

Kim

Park

2015

Journal of the Optical Society of Korea

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We propose a reactive mesogen (RM) lens array to obtain good focusing behavior along with a short focal plane, where the focusing behavior is switchable according to the polarization state of incident light. Polarization-dependent focusing behavior is obtained using a planoconvex RM microlens array on a planoconcave isotropic lens template. Even though the sagitta of our RM lens is high, to obtain the short focal length, the RM layer can be aligned well by introducing a top-down alignment effect, using a nanogrooved template. The optical noise due to the moiré effect generated by the nanogrooves on the surface of the planoconvex RM layer can be removed simply by overcoating a thin RM layer, which is self-aligned by the geometric surface effect, without an additional alignment process. We demonstrate a hexagonal-packed RM lens array that has a very high fill factor and symmetric phase profile, for an ideal lens.

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Section: Introductionmentioning

confidence: 99%

Polarization-Dependent Microlens Array Using Reactive Mesogen Aligned by Top-Down Nanogrooves for Switchable Three-Dimensional Applications

Son

Kim

Park

2015

Journal of the Optical Society of Korea

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“…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%

Optimal period for diffraction gratings recorded in polymer dispersed liquid crystals

Aslanyan

Galstyan

2007

Opto-Electronics Review

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New diffusion model of recording diffraction gratings in the media of PDLC is described in which besides diffusion of monomer molecules also diffusion of polymer molecules and non-locality of diffusion coefficient are taken into account. It lets us to explain why diffraction efficiency is low for low and high values of intensities of grating recording beam. With the considered model, we have theoretically got optimal period for grating recording.

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“…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.…”

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confidence: 99%

Graphene-Based Ultrathin Flat Lenses

et al. 2015

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Flat lenses when compared to curved surface lenses have the advantages of being aberration free, and they offer a compact design necessary for a myriad of electro-optical applications. In this paper we present flat and ultrathin lenses based on graphene, the world's thinnest known material. Monolayers and multilayers of graphene were fabricated into Fresnel zones to produce Fresnel zone plates, which utilize the reflection and transmission properties of graphene for their operation. The working of the lenses and their performance in the visible and terahertz regimes were analyzed computationally. Experimental measurements were also performed to characterize the lens in the visible regime, and a good agreement was obtained with the simulations. This work demonstrates the principle of atom-thick graphene-based lenses, with perspectives for ultracompact integration.

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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.

Cited by 121 publications

References 11 publications

Polarization-Dependent Microlens Array Using Reactive Mesogen Aligned by Top-Down Nanogrooves for Switchable Three-Dimensional Applications

Polarization-Dependent Microlens Array Using Reactive Mesogen Aligned by Top-Down Nanogrooves for Switchable Three-Dimensional Applications

Optimal period for diffraction gratings recorded in polymer dispersed liquid crystals

Graphene-Based Ultrathin Flat Lenses

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