A Nematic Liquid Crystal as an Amplifying Replica of a Holographic Polarization Grating

Blinov, L. M.; Cipparrone, G.; Mazzulla, A.; Provenzano, C.; Palto, S. P.; Barnik, M. I.; Arbuzov, A. V.; Umanskiĭ, B. A.

doi:10.1080/15421400600583919

Cited by 14 publications

(7 citation statements)

References 8 publications

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“…Liquid crystal (LC) polarization gratings [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] exhibit high first-order diffraction efficiency (theoretically 100%) and excellent polarization splitting properties. Because of these advantages, their potential applications are projection-type displays [17], polarization converters [18], and Stokes polarimeters [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Twisted nematic liquid crystal polarization grating with the handedness conservation of a circularly polarized state

Honma¹,

Nose²

2012

Opt. Express

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We propose a liquid crystal (LC) polarization grating that conserves the polarization state of incident light, wherein the variation range of the twist angle is 2π. The design scheme for theoretically 100% diffraction efficiency of the first-diffraction order is derived, and a prototype LC grating is evaluated. Under zero voltage, the fabricated LC grating exhibits high efficiency of the first-order diffraction, validating the proposed design scheme. The high efficiency of the second-order diffraction can also be achieved under a high voltage so that the LC director in the midplane is vertical to the substrate plane. The circular polarization sense of the second-order diffraction is identical to that of the incident light as in the case of the first-order diffraction. This grating functions as a beam deflector, steering the input beam in three different directions (zeroth-, first-, and second-order diffractions) by adjusting the applied voltage.

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Section: Introductionmentioning

confidence: 99%

Twisted nematic liquid crystal polarization grating with the handedness conservation of a circularly polarized state

Honma¹,

Nose²

2012

Opt. Express

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“…Notice that the period of the modulation of the polarization Λ λ∕2 sin θ (see Fig. 1) is twice as short as the period of the spatial modulation of the electric field ⃗ E [18]. The beams' diameters measured at the half-width of the Gaussian profile were about 0.2 mm.…”

Section: Methodsmentioning

confidence: 99%

“…The diffraction efficiency of polarization holograms recorded in thin films can be enormously enhanced due to a liquid crystal (LC) layer deposited on top of the polarization holograms [16][17][18][19][20][21][22][23]. In this case, due to a photoalignment effect [24], the director of an LC is aligned along the local direction of the lightinduced anisotropy axis on the hologram surface.…”

Section: Introductionmentioning

confidence: 99%

Recording of polarization holograms in a liquid crystal cell with a photosensitive chalcogenide orientation layer [Invited]

et al. 2013

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Polarization gratings have been recorded in a combined liquid crystal (LC) cell made of a substrate covered with a photosensitive chalcogenide orientation layer and a reference substrate covered with a rubbed polyimide film. The gratings are formed due to the spatially modulated light-induced easy orientation axis on the chalcogenide surface recorded by two beams with opposite circular polarizations. The gratings are permanent, but they can be erased by one of the recording beams and re-recorded. The diffraction intensity of the circularly polarized light is achromatic and does not depend on the birefringence of the LC. The diffraction efficiency of the grating is of the order of a few percents. Application of an ac field causes a strong increase of the diffraction efficiency up to 45%.

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“…First, the 0.2% Brilliant Yellow (BY, Tokyo Chemical Industry) solution was spin‐coated on pretreated quartz substrate (2 mm thickness) followed by 100 °C baking for 5 min. Second, a polarization holographic interference setup of 457 nm as discussed above was used to expose the photo‐alignment (PA) layer of BY (20–30 nm thickness) [ 57 ] for 30 min (laser power of 2 W and power density of 5 mW cm −2 ). In this process, PA layer was modulated by the vector field so that the molecules rotate their orientation perpendicular to the polarization direction of vector field, and the spatial polarization information is replicated in the aligned PA layer.…”

Section: Design and Fabricationmentioning

confidence: 99%

Shortening Focal Length of 100‐mm Aperture Flat Lens Based on Improved Sagnac Interferometer and Bifacial Liquid Crystal

Wen

Zhang

et al. 2023

Advanced Optical Materials

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Conventional lens technologies face great challenges in applications requiring large apertures and small f‐numbers, while a liquid crystal (LC) lens based on geometric phase is a potential solution. However, the challenge of manufacturing a large size LC flat lens with high efficiency and high phase gradient still remains. Here, an improved interferometric exposure system is proposed to acquire a large‐size vectorial optical field for photo‐alignment. Bifacial LC layers are applied to reduce the focal length while maintaining a large aperture, high diffraction efficiency, and light weight. LC layers are deposited on both sides of the substrate with the same vector system. Finally, a bifacial LC flat lens with a 10 cm diameter and 88.37% diffraction efficiency is fabricated by using optical elements smaller than 2 in., while the effective focal length is reduced from 91.5 cm to 46 cm comparing to the single side LC lens. This work demonstrates the great advantages of LC‐based flat lenses for flat optical systems with large aperture.

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A Nematic Liquid Crystal as an Amplifying Replica of a Holographic Polarization Grating

Cited by 14 publications

References 8 publications

Twisted nematic liquid crystal polarization grating with the handedness conservation of a circularly polarized state

Twisted nematic liquid crystal polarization grating with the handedness conservation of a circularly polarized state

Recording of polarization holograms in a liquid crystal cell with a photosensitive chalcogenide orientation layer [Invited]

Shortening Focal Length of 100‐mm Aperture Flat Lens Based on Improved Sagnac Interferometer and Bifacial Liquid Crystal

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