Design and Fabrication of High-Performance Liquid Crystal Gratings

Yu, Chang‐Jae; Jang, Eunjoo; Lee, Sin‐Doo

doi:10.1080/15421400600656095

Cited by 5 publications

(5 citation statements)

References 24 publications

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“…Currently, the latest novel trend in the application of photoalignment technology is the development and fabrication of the reconfigurable LC diffractive gratings for projection displays. 5,6 The application of photoalignment technology to LCD production is still limited to the laboratory. Largescale deployment of PA technology is suppressed by the lack of a good material and by long-term stability; worth mentioning is the lack of suitable mass-production-scale equipment.…”

Section: Photoalignmentmentioning

confidence: 99%

Optical rewritable liquid‐crystal‐alignment technology

Muravsky¹,

Murauski²,

Li³

et al. 2007

J Soc Info Display

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Abstract— A new optical rewritable (ORW) liquid‐crystal‐alignment technology has been developed to create a display and to demonstrate its maturity and potential. ORW displays have no electrodes and use polarizers as substrates. The display requires no photolithography on plastic. Its simple construction secures durability and low cost for mass production. The on‐screen information is optically changed in a writing unit that consists of an LCD mask and an exposure source that is based on LEDs, low power, and low cost in comparison with Hg lamps or lasers. A high contrast image can be easily written, viewed, and rewritten through a polarizer, while the multi‐stable gray‐level image requires zero power to maintain the image. Reconfigurable LC alignment using ORW technology best suits plastic‐card displays as well as for LC photonics and various one‐mask processes of patterned LC‐alignment applications.

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Section: Photoalignmentmentioning

confidence: 99%

Optical rewritable liquid‐crystal‐alignment technology

Muravsky¹,

Murauski²,

Li³

et al. 2007

J Soc Info Display

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“…The diffraction optics were used here for the detection of the intensity change of the diffraction patterns due to the redistribution of patterns affected by the applied magnetic field. The diffraction patterns can be generated by several methods, such as mechanically moving wedge plates [16], tunable gratings [17], switchable gradient index lenses [18], polymer dispersed LC techniques [19,20], phase modulating using spatial light modulator (SLM) [21,22], stretchable binary Fresnel lens [23], and dual-frequency liquid crystal-based dynamic fringe pattern generator (LC-DFPG) [24]. In this work, the diffraction patterns are generated from the micro-lines scribed on the polymer layer that is sandwiched in the LC cell.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Liquid Switching Using Rodlike Ferronematic 6CHBT Liquid Crystal Mixture Depending on the Diffraction Patterns

Ibrahim¹,

Mahmood²,

Gdovinová

et al. 2021

eijs

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Diffraction patterns formed by a ferronematic sample, which contains 4-(trans-4-n-hexylcyclohexyl)-isothiocyanatobenzene (6CHBT) liquid crystal doped with Fe3O4 rodlike magnetic nanoparticles, was studied. The studied mixture can be applicated as a liquid magnetic switch. The diffraction patterns were observed from the micro-lines scribed on the polymer layer, which was contained by the liquid crystal mixture cell, with dimensions of 4 nm for depth and 0.32 µm for width and 5000 line per 1 mm2 in the case of absence and presence of the DC magnetic field. From the experimental results, it was observed that the application of the magnetic field caused more than 17% expansion in the diffraction patterns area at the focused point, while the number of patterns was increased by 25%. This change in the diffraction area due to the application of a magnetic field gives the motive to sense the low DC magnetic field which could be useful in the application of liquid switching.

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“…These are generated by beam pattern projecting modules such as mechanically moving wedge plates [15], tunable gratings [16], switchable gradient index lenses [17], polymer dispersed liquid crystal (LC) techniques [18,19], and several types of phase modulators using SLMs [20,21]. Recently, to obtain color information of an object in addition to the 3D depth information, time-sequential projection of structured and RGB-colored beam patterns was also proposed using fast switching digital light processing (DLP) projectors [22].…”

Section: Introductionmentioning

confidence: 99%

A 3D Optical Surface Profilometer Using a Dual-Frequency Liquid Crystal-Based Dynamic Fringe Pattern Generator

Joo

Kim

Park

et al. 2016

Sensors

Self Cite

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We propose a liquid crystal (LC)-based 3D optical surface profilometer that can utilize multiple fringe patterns to extract an enhanced 3D surface depth profile. To avoid the optical phase ambiguity and enhance the 3D depth extraction, 16 interference patterns were generated by the LC-based dynamic fringe pattern generator (DFPG) using four-step phase shifting and four-step spatial frequency varying schemes. The DFPG had one common slit with an electrically controllable birefringence (ECB) LC mode and four switching slits with a twisted nematic LC mode. The spatial frequency of the projected fringe pattern could be controlled by selecting one of the switching slits. In addition, moving fringe patterns were obtainable by applying voltages to the ECB LC layer, which varied the phase difference between the common and the selected switching slits. Notably, the DFPG switching time required to project 16 fringe patterns was minimized by utilizing the dual-frequency modulation of the driving waveform to switch the LC layers. We calculated the phase modulation of the DFPG and reconstructed the depth profile of 3D objects using a discrete Fourier transform method and geometric optical parameters.

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Design and Fabrication of High-Performance Liquid Crystal Gratings

Cited by 5 publications

References 24 publications

Optical rewritable liquid‐crystal‐alignment technology

Optical rewritable liquid‐crystal‐alignment technology

Magnetic Liquid Switching Using Rodlike Ferronematic 6CHBT Liquid Crystal Mixture Depending on the Diffraction Patterns

A 3D Optical Surface Profilometer Using a Dual-Frequency Liquid Crystal-Based Dynamic Fringe Pattern Generator

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