Tunable Liquid Crystal Lens Based on Pretilt Angle Gradient Alignment

Bezruchenko, Veronika; Muravsky, Alexander; Murauski, Anatoli; Станкевич, А. И.; Mahilny, U. V.

doi:10.1080/15421406.2015.1106890

Cited by 19 publications

(16 citation statements)

References 9 publications

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“…As it was shown recently, polymers containing photosensitive benzaldehyde groups in the side chain can be used as alignment materials to form the microlens structures in the LC cell successfully …”

Section: Introductionmentioning

confidence: 99%

“…In the LC cell of specific configuration, such controllable change of the pretilt angle forms polarization‐dependent gradient of the refractive index. This unique property of gradient benzaldehyde polymers (GBP) is suitable for LC lenses creation . GBP materials properties also are temporally stable and verified for thermal stability below 100°C, while high temperature stability has not been tested.…”

Section: Introductionmentioning

confidence: 99%

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Alignment materials with controllable anchoring energy

et al. 2018

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New polymers with photo-controllable anchoring energy and tunable pretilt angle within 90°-0°range for nematic liquid crystals alignment were developed. The functional properties of polymers are provided by the effect of photoinduced planar alignment and the presence of side hydrocarbon chains in macromolecules that create a homeotropic alignment effect. Applying photosensitive alignment layers based on polymers with side benzaldehyde and hydrocarbon groups, fabrication of optical devices with refractive index gradient, uniform cell gap, and low operation voltage is possible. The developed materials are suitable for simple fabrication of tunable liquid crystal lenses.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Alignment materials with controllable anchoring energy

et al. 2018

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“…Tunable-focus liquid crystal (LC) microlens array has become an essential optical component for image processing [1][2][3][4][5][6][7][8][9][10][11][12], beam steering [13][14][15], wavefront correction [16] and switchable 2D/3D displays [17][18][19]. A key to tune the focal length is to create parabolic phase profile by spatially controlling the LC director reorientations, such as introducing inhomogeneous electric field distribution or creating gradient pretilt angle alignment [20,21]. To do so, several approaches have been developed, including curved electrodes [22], patterned electrodes [23], polymer-stabilization [24], composite alignment [25], and composite lenses [26], just to name a few.…”

Section: Introductionmentioning

confidence: 99%

Adaptive liquid crystal microlens array enabled by two-photon polymerization

Lee

Chanda

et al. 2018

Opt. Express

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A tunable-focus liquid crystal microlens array is demonstrated and characterized. Using two-photon polymerization based direct-laser writing, a polymerized microlens array is fabricated on one substrate. Such a microlens array creates inhomogeneous electric field distribution and homogeneous-like liquid-crystal alignment, simultaneously. The phase profile and thus the focal length can be tuned dynamically by the applied voltage. We also further investigate the focusing property and the imaging capability of the fabricated sample. Using the adaptive microlens array as an example, we demonstrate that directly forming a curvilinear surface with liquid-crystal alignment is feasible. In addition to adaptive lens, this direct-laser writing method is also a powerful tool for making other tunable photonic devices.

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“…converting it into a reticulated polymer, resistant to the action of organic solvents. This allowed thin layers of benzaldehyde alignment materials, both planar and gradient, to be deposited on its surface without destroying the waveguide layer[2,4]. TheDOI 10.18502/ken.v3i3.2008 Page 8 KnE Energy & Physics PhIO-2018 isotropic layers of the photo-crosslinkable copolymer were applied by spin-coating from the solution onto glass substrates.…”

mentioning

confidence: 99%

“…Photosensitive benzaldehyde fragments provide photocrosslinking of the material under the influence of UV radiation, making it resistant to the action of organic solvents. This allowed the thin (∼50-100 nm) benzaldehyde alignment layers, both planar and gradient[2,4], to be deposited on its surface without destruction of the waveguide layer. We tested the application of a single and double alignment layer, because such an operation is part of multi-domain technology[2].…”

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confidence: 99%