Active Optical Beam Shaping Based on Liquid Crystals and Polymer Micro-Structures

Shang, Xiaobing; Cuypers, Dieter; Baghdasaryan, Tigran; Vervaeke, Michael; Thienpont, Hugo; Beeckman, Jeroen; Neyts, Kristiaan; Li, Quan; Wu, Chao; Li, Hongqiang; Jiang, Changjun; Smet, Herbert De

doi:10.3390/cryst10110977

Cited by 6 publications

(8 citation statements)

References 92 publications

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“…Sec-ondly, for minimum optical losses, the refractive index of the dielectric inclusion should match that of either n e or n o . This has been addressed largely through the design and utilization of the refractive index matching Reactive Mesogen (RM) materials, which offer the dual advantages of the matched refractive index whilst simultaneously acting as an alignment layer for the LC layer [121,133,137]. Thirdly, such devices often have very high driving voltages, due to the dielectric dividing layers put down in the fabrication process (see Section 2.4).…”

Section: Diffractive Dielectric Inclusions and Exclusionsmentioning

confidence: 99%

“…Thirdly, such devices often have very high driving voltages, due to the dielectric dividing layers put down in the fabrication process (see Section 2.4). the dual advantages of the matched refractive index whilst simultaneously acting as alignment layer for the LC layer [121,133,137]. Thirdly, such devices often have very h driving voltages, due to the dielectric dividing layers put down in the fabrication proc (see Section 2.4).…”

Section: Diffractive Dielectric Inclusions and Exclusionsmentioning

confidence: 99%

“…Micromachines 2021, 12, 247 14 of the dual advantages of the matched refractive index whilst simultaneously acting as a alignment layer for the LC layer [121,133,137]. Thirdly, such devices often have very hig driving voltages, due to the dielectric dividing layers put down in the fabrication proce (see Section 2.4).…”

Section: Single Patterned Electrode Devicesmentioning

confidence: 99%

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Liquid Crystal Devices for Beam Steering Applications

2021

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Liquid crystals are valuable materials for applications in beam steering devices. In this paper, an overview of the use of liquid crystals in the field of adaptive optics specifically for beam steering and lensing devices is presented. The paper introduces the properties of liquid crystals that have made them useful in this field followed by a more detailed discussion of specific liquid crystal devices that act as switchable optical components of refractive and diffractive types. The relative advantages and disadvantages of the different devices and techniques are summarised.

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Section: Diffractive Dielectric Inclusions and Exclusionsmentioning

confidence: 99%

Section: Diffractive Dielectric Inclusions and Exclusionsmentioning

confidence: 99%

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Liquid Crystal Devices for Beam Steering Applications

2021

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“…Diffraction gratings are made of a set of linear parallel elements with a pitch comparable to the light wavelength [25]. Diffractive gratings are manufactured using different methods, as recently reviewed in [26].…”

Section: Beam Steerers For Space Applicationsmentioning

confidence: 99%

Two-Dimensional Digital Beam Steering Based on Liquid Crystal Phase Gratings

et al. 2021

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Electrically tunable phase gratings are able to steer an incoming light beam without employing movable parts. Here, we present the design and implementation of a 2D beam steering device by cascading two orthogonal 1D liquid crystal (LC) based phase gratings, each having an array of 72 rectangular individually controlled pixels and driven by a custom 12-bit Pulse-Width Modulation (PWM) electrical driver. High-resolution structures in glass wafers coated with transparent Indium-Tin Oxide (ITO) have been prepared using Direct Laser Writing (DLW) techniques. With DLW, a high number of pixels can easily be drawn with an interpixel space of less than 3 μm, leading to devices with a high fill factor. The active area of the cascaded device is 1.1 × 1.1 mm2. We present a 72 × 72 point efficiency map corresponding to a maximum diagonal steering angle of 1.65°. Special attention has been paid to make the device compatible with space application by avoiding electronics in the active area.

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“…The ITO electrode is used not only in LCDs but also in many displays such as organic light emitting diodes (OLED) and quantum dot light emitting diodes (QLED) [ 6 , 7 , 8 , 9 ]. In addition, the alignment layer that determines the initial orientation of the LC is also important, and the most commonly used material for this layer is polyimide (PI) [ 10 , 11 , 12 , 13 , 14 , 15 , 16 ]. The LC can be uniformly aligned along a desired direction through the interactions of the LC molecules at the molecular level.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of TiO2-Embedded Polyimide Layer with High Transmittance and Improved Reliability for Liquid Crystal Displays

Son

Choi

et al. 2021

Polymers

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Construction of liquid crystal (LC) alignment by introducing polyimide (PI) to indium tin oxide (ITO) electrodes is one of the main methods to realize high-resolution images in liquid crystal displays (LCD). However, the loss of transmittance caused by the difference in refractive index between ITO and PI leads to direct degradation of LCD performance. Thus, we herein fabricated a functional hybrid PI alignment layer that reduces the difference in refractive index and greatly increases the transmittance of the device by introducing inorganic titanium dioxide (TiO2) nanoparticles (NP) to the organic PI. The highly refractive TiO2 NPs were surface-treated with stearic acid comprising long alkyl chains to improve their dispersibility and uniformly dispersed in the PI matrix by simply stirring the mixture. The hybrid PI mixture was spin-coated on the ITO substrate, and the resulting LC cell exhibited excellent electro-optical properties. In addition, the reliability of the LC cells was enhanced by the inclusion of the TiO2 NPs, which was confirmed through the evaluation of voltage holding ratio, residual direct current, and LC cell reliability. Overall, functional hybrid PI can be used in advanced display technology for next-generation LC devices that require high transmittance and reliability.

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Active Optical Beam Shaping Based on Liquid Crystals and Polymer Micro-Structures

Cited by 6 publications

References 92 publications

Liquid Crystal Devices for Beam Steering Applications

Liquid Crystal Devices for Beam Steering Applications

Two-Dimensional Digital Beam Steering Based on Liquid Crystal Phase Gratings

Fabrication of TiO2-Embedded Polyimide Layer with High Transmittance and Improved Reliability for Liquid Crystal Displays

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