Polarization-Independent Liquid Crystal Grating Fabricated by Microrubbing Process

Honma, Mareki; Nose, Toshiaki

doi:10.1143/jjap.42.6992

Cited by 71 publications

(36 citation statements)

References 2 publications

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“…Macroscopically, a set of parallel walls rubbed in the same direction is approximately a candidate. We have the possi− bility of preparation of such walls by a technique something like a soft−rubbing method together with light alignment [24,25], rubbing with the aid of an atomic force micrometer [26,27] or microrubbing process at a homeotropic wall [28,29]. Especially, a wall with a chequer−patterned surface composed of squares or rectangles of sub−micrometer size rubbed in opposite directions may construct the biaxial wall.…”

Section: Discussionmentioning

confidence: 99%

Effects of fields and anchoring on biaxial nematic ordering

Yasen

Torikai

Yamashita

2009

Opto-Electronics Review

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Symmetry of a nematic liquid crystal phase is broken by an anchoring wall and also by an external field. Nematic system sandwiched between biaxial anchoring walls is introduced as a correspondent to a bulk nematic system exposed to a couple of fields, an electric field and a magnetic one in directions perpendicular to each other, and thermal behaviours of the system are studied. The crossover between a homeotropic structure and homogeneous one occurs, similarly to the bulk system in the fields, in which the anchoring condition of coexistence is shown to have the same expression as the one at the bulk. As to a characteristic phenomenon at the sandwiched system, it is proved that an appearance of a biaxial nematic order suppresses a uniaxial nematic order. A surface transition, i.e., a wetting phenomenon is shown to occur also in the biaxial nematics, even though the uniaxial order is suppressed therein.

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Section: Discussionmentioning

confidence: 99%

Effects of fields and anchoring on biaxial nematic ordering

Yasen

Torikai

Yamashita

2009

Opto-Electronics Review

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“…However, for simple switchable or little tuneable phased arrays, a single electrode may be employed. In this sense, various technologies have been proposed, double perpendicular rubbing [7], corrugation of the alignment layer [8], and polymer-doped LC [9]. A common trait of these technologies is that there is no definition of individual pixels.…”

Section: Introductionmentioning

confidence: 99%

Design and simulation of single-electrode liquid crystal phased arrays

Bellini

Geday

Bennis

et al. 2006

Opto-Electronics Review

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Liquid crystal (LC) phased arrays and gratings have been employed in optical switching and routing [1]. These diffractive optic elements are of great interest because they can be scaled up to a large number of elements and their optical properties can be electrically addressed with a low driving voltage. LC phase gratings have been achieved either by periodic addressing of pixels or by using periodically-modified structures. The latter approach leads to less reconfigurable devices but the addressing is simpler.In this paper we focus on optical phased arrays where the phase is varied either continuously or discretely and where the periodicity is induced by electrode configuration. We first describe a possible structure based on a conductive silicon wafer. We argue that this structure can induce either continuously or discretely varying arrays while applying single voltage to the array. In the second part we simulate the behaviour of such arrays. We base the simulation on a LC synthesized at the Military University of Technology, this high-birefringence nematic LC shows in a 4-μm thick cell a linear phase shift range of more than 360° between 1.2 V and 1.8 V. We calculate the distribution of the LC molecule director and assess the performance of the array with respect to the applied voltage. Finally, the relevance of such technology for switchable phased arrays is discussed.

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“…The -rubbing process has also recently been used for fabricating liquid crystal gratings. 20 In this study, the viewing angle characteristics, contrast ratio, electro-optical characteristics, and director orientations are demonstrated by means of experiments and numerical simulations. This is a comprehensive study that leverages our earlier letters paper.…”

Section: Introductionmentioning

confidence: 99%

High pretilt four-domain twisted nematic liquid crystal display by microrubbing: Process, characterization, and optical simulation

Varghese

Crawford

Bastiaansen

et al. 2005

Journal of Applied Physics

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. (2005). High pretilt fourdomain twisted nematic liquid crystal display by microrubbing : process, characterization and optical simulation. Journal of Applied Physics, 97(5), 53101-1/8. [53101]. DOI: 10.1063/1.1854203 General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. A microrubbing ͑-rubbing͒ technique was utilized to create four-domain alignment in a liquid crystal display sample. A small metallic sphere under sufficient load was used to directly rub a homeotropic polyimide alignment layer to create a large surface pretilt angle. We demonstrate a 47-m linewidth and a variable pretilt angle with respect to the substrate plane for different loads. The homeotropic polyimide surface was rubbed in such a way that neighboring alignment regions are rubbed in opposite directions. liquid crystal cells were constructed with two -rubbed substrates where the rubbing directions are orthogonal to each other. With this cell configuration we obtained four domains consisting of two left-handed and two right-handed twisted nematic subpixels. We report on the electro-optic performance properties, viewing angle characteristics, the relationship between pretilt angle versus load, and thermal aging study of the four-domain liquid crystal cell. The optical simulations of the liquid crystal director orientation, viewing angle characteristics, and the contrast ratio of the four domains are also presented. The experimental results are in agreement with the simulation results.

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Polarization-Independent Liquid Crystal Grating Fabricated by Microrubbing Process

Cited by 71 publications

References 2 publications

Effects of fields and anchoring on biaxial nematic ordering

Effects of fields and anchoring on biaxial nematic ordering

Design and simulation of single-electrode liquid crystal phased arrays

High pretilt four-domain twisted nematic liquid crystal display by microrubbing: Process, characterization, and optical simulation

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