Photoinduced liquid crystal alignment based on a surface relief grating in an assembled cell

Li, Xiang Tong; Natansohn, Almeria; Rochon, P.

doi:10.1063/1.124181

Cited by 74 publications

(57 citation statements)

References 18 publications

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“…Photoinduced surface relief gratings in a photopolymer are attractive for their applications in diffractive optical elements [1,2], optical data storage [3], recording computer generated holograms [4] and the alignment of liquid crystals [5][6][7][8]. There has been extensive growth of technological applications of liquid crystals, such as photonic components and liquid crystal displays (LCDs) in the last two decades.…”

Section: Introductionmentioning

confidence: 99%

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Photoinduced surface relief studies in an acrylamide-based photopolymer

Kotakonda¹,

Naydenova²,

Martin³

et al. 2006

J. Opt. A: Pure Appl. Opt.

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Surface relief gratings (SRGs) have been optically recorded in a dry, selfdeveloping acrylamide-based photopolymer. An investigation of the dependence of photoinduced surface relief amplitude and profile on recording intensity, UV postexposure, thickness of the sample, composition of the photopolymer and temperature at constant spatial frequency was carried out using white light interferometry. Nonsinusoidal surface relief grating profiles which depend on sample thickness were observed at low spatial frequency. The surface relief effect is intended to be applied to the alignment of liquid crystals (LCs) for different applications such as voltage controllable diffraction gratings, lenses, polarizing components and switches.

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Section: Introductionmentioning

confidence: 99%

“…This effect is often called surface relief amplitudemodulation. Light-induced SRGs in a photopolymer have the potential to align LCs [5][6][7][8]. So, it is important to investigate the mechanism of the formation of surface relief gratings depending on recording parameters and physical parameters.…”

Section: Introductionmentioning

confidence: 99%

Photoinduced surface relief studies in an acrylamide-based photopolymer

Kotakonda¹,

Naydenova²,

Martin³

et al. 2006

J. Opt. A: Pure Appl. Opt.

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“…Li and coworkers reported that the PSR structure can tightly anchor the liquid crystal (LC) molecules, and the stability and the transmittance of the PSR/LC assembly could be improved by photobleaching. It is also proposed that this alignment method can be applied to create an in-plane switching device [133][134][135]. Quantitative examination of the anchoring force associated with the PSR structure has been presented by Chung and coworkers [136].…”

Section: Applicationsmentioning

confidence: 99%

Optical and Physical Applications of Photocontrollable Materials: Azobenzene-Containing and Liquid Crystalline Polymers

2012

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Photocontrol of molecular alignment is an exceptionally-intelligent and useful strategy. It enables us to control optical coefficients, peripheral molecular alignments, surface relief structure, and actuation of substances by means of photoirradiation. Azobenzene-containing polymers and functionalized liquid crystalline polymers are well-known photocontrollable materials. In this paper, we introduce recent applications of these materials in the fields of mechanics, self-organized structuring, mass transport, optics, and photonics. The concepts in each application are explained based on the mechanisms of photocontrol. The interesting natures of the photocontrollable materials and the conceptual applications will stimulate novel ideas for future research and development in this field.

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“…They are used in the mass production of holograms for applications related with security purposes and holographic-based memories [1] in addition to other applications [2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Shrinkage measurement for holographic recording materials

et al. 2017

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There is an increasing demand for new holographic recording materials. One of them are photopolymers, which are becoming a classic media in this field. Their versatility is well known and new possibilities are being created by including new components, such as nanoparticles or dispersed liquid crystal molecules in classical formulations, making them interesting for additional applications in which the thin film preparation and the structural modification have a fundamental importance. Prior to obtaining a wide commercialization of displays based on photopolymers, one of the key aspects is to achieve a complete characterization of them. In this sense, one of the main parameters to estimate and control is the shrinkage of these materials. The volume variations change the angular response of the hologram in two aspects, the angular selectivity and the maximum diffraction efficiency. One criteria for the recording material to be used in a holographic data storage application is the shrinkage, maximum of 0.5%. Along this work, we compare two different methods to measure the holographic recording material shrinkage. The first one is measuring the angle of propagation for both diffracted orders ±1 when slanted gratings are recorded, so that an accurate value of the grating vector can be calculated. The second one is based on interference measurements at zero spatial frequency limit. We calculate the shrinkage for three different photopolymers: a polyvinyl alcohol acrylamide (PVA/AA) based photopolymer, one of the greenest photopolymers whose patent belongs to the Alicante University called Biophotopol and on the last place a holographic-dispersed liquid crystal photopolymer (H-PDLC)..

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Photoinduced liquid crystal alignment based on a surface relief grating in an assembled cell

Cited by 74 publications

References 18 publications

Photoinduced surface relief studies in an acrylamide-based photopolymer

Photoinduced surface relief studies in an acrylamide-based photopolymer

Optical and Physical Applications of Photocontrollable Materials: Azobenzene-Containing and Liquid Crystalline Polymers

Shrinkage measurement for holographic recording materials

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