Periodically Aligned Liquid Crystal: Potential Application for Projection Displays

Sarkissian, H.; Park, B.; Tabirian, Nelson; Zel'dovich, Boris Ya

doi:10.1080/154214090959957

Cited by 68 publications

(33 citation statements)

References 13 publications

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“…(12), fluctuates more with x when the difference between K 3 and K 1 is larger (K 3 − K 1 is known to be relatively large for E7 in Fig. 12(b) [29], while it is small for the liquid crystal in Fig. 12(a)).…”

Section: Production Of Small-period Polarization Gratingsmentioning

confidence: 99%

“…Intuitively, one may therefore assume that liquid crystals with large K 2 and small K 3 − K 1 result in more stable polarization gratings By assuming a small distortion θ n depending only on z (where z is the coordinate normal to the grating plane), it can be shown analytically that the director in Eq. (10) does not correspond to a minimum of the total free energy when the thickness d exceeds a certain critical value d c [29,30]. For d > d c the alignment will get distorted for every x.…”

Section: Production Of Small-period Polarization Gratingsmentioning

confidence: 99%

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Surface-relief and polarization gratings for solar concentrators

2011

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Transmission gratings that combine a large diffraction angle with a high diffraction efficiency and a low angular and wavelength dispersion could be used to collect sunlight in a light guide. In this paper we compare the diffractive properties of polarization gratings and classical surface-relief gratings and explore their possible use in solar concentrators. It is found that polarization gratings and surface-relief gratings have qualitatively comparable diffraction characteristics when their thickness parameters are within the same regime. Relatively large grating periods result in high diffraction efficiencies over a wide range of incident angles. For small grating periods the efficiency and the angular acceptance are decreased. Surface-relief gratings are preferred over polarization gratings as in-couplers for solar concentrators.

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Section: Production Of Small-period Polarization Gratingsmentioning

confidence: 99%

Section: Production Of Small-period Polarization Gratingsmentioning

confidence: 99%

Surface-relief and polarization gratings for solar concentrators

2011

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“…7 / OPTICS EXPRESS 6704 ral dopants are already well known circular birefringent materials. An alternative recording material is the combination of a liquid crystal (LC) and a photo-alignment film (such as, linearphoto-polymers or LPP) [5][6][7][8][9]. Circular birefringence can be obtained by mixing light-driven rotor [10] materials into LCs.…”

Section: Introductionmentioning

confidence: 99%

Photoanisotropic polarization gratings beyond the small recording angle regime

Xu¹,

Boer²,

Heesch³

et al. 2010

Opt. Express

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Abstract:Polarization gratings can be realized by polarization holographic recording in photoanisotropic materials. In this paper, we study two types of polarization gratings. One is recorded with two orthogonally circularly (OC) polarized beams and the other one with two orthogonally linearly (OL) polarized beams. The interference of both cases is explored beyond the small recording angle regime. A novel method is proposed to represent the polarization states of the modulation. The diffraction by polarization gratings is studied with rigorous diffraction theory. Simulations based on the Finite Element Method are performed for both OC and OL polarization gratings at small and large recording angles.

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“…A mesogen-based polarization grating has been demonstrated to be a promising diffractive optical element, which typically exhibits insensitivity to wavelength and high diffraction efficiency (>97 %) [22,23]. Such polarization gratings are used to develop polarimeters [24] and imaging systems [23,25]. Combining two optical axis gratings can produce various interesting diffraction outcomes [23].…”

Section: Photo-isomerization In Azo-compound-containing Polymer/dye Fmentioning

confidence: 99%

Photo-Alignment Technology

Lin

2014

Topics in Applied Physics

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LCDs are used in many everyday devices, including mobile phones, notebook computers and wide screen televisions. A typical LCD is composed of two glass substrates between which is a gap that is filled with LC. The arrangement of the LC is controlled by the boundary condition of an alignment film. A long-range orientational interaction causes the preferable alignment of a LC by the surface boundary to extend into the LC bulk. The alignment layer is typically rubbed with a special cloth to induce a unidirectional alignment of the LC. In the first devices based on twisted LCs, these LCs were aligned only by rubbing transparent electrodes. The rubbing technique became much more reliable when the glass substrate was covered with a rubbed polymer layer. The rubbing of polymers is a very simple technique and it is now extensively utilized in both small scientific laboratories and large LCD factories.Despite the extensive use of rubbing in LCD manufacturing, it has some serious shortcomings that arise from the contact involved in rubbing. These critically affect the production of the most recent generation of LCDs and miniature LC photonic devices. First, rotational rubbing for the polymer surface causes the accumulation of static charges and the formation of fine dust particles. The accumulation of static electricity may destroy the transistors or diodes in the LCD. The second shortcoming is the effect of decreasing in manufacturing yield. Rubbing for large and high-resolution active matrix LCDs (AMLCDs) involve additional difficulties that are associated with the precise control of the rubbing characteristics. Other problems are the difficulty of producing local structures with the required LC director alignment in the selected areas of the device. Finally, this method cannot be used to align LCs in closed volumes.For all of the above reasons, new alignment solutions and approaches are sought. There are some alternative methods of rubbing include laser writing, micro-rubbing, ion beam irradiation and photoalignment. Of these methods, the

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Periodically Aligned Liquid Crystal: Potential Application for Projection Displays

Cited by 68 publications

References 13 publications

Surface-relief and polarization gratings for solar concentrators

Surface-relief and polarization gratings for solar concentrators

Photoanisotropic polarization gratings beyond the small recording angle regime

Photo-Alignment Technology

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