Effect of ferroelectric nanoparticles in the alignment layer of twisted nematic liquid crystal display

John, Nimmy L.; Shiju, E; Renganathan, R.R. Arun; Varma, M. K. Ravi; Chandrasekharan, K.; Sandhyarani, N.; Varghese, Soney

doi:10.1016/j.optmat.2017.03.022

Cited by 31 publications

(6 citation statements)

References 14 publications

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“…The incorporation of various nanoscale materials, including magnetic and ferroelectric nanoparticles, carbon nanotubes, and nanosolids, into twisted nematic liquid crystals (TNLCs) has also been a subject of investigation. The results revealed that these materials can effectively manipulate the electrical and magnetic properties of TNLC, thanks to the efficient templating provided by the TNLC structure [27][28][29][30][31]. An efficient method for inducing twisting in NLCs involves orienting the rubbing directions of anchoring materials on two substrates perpendicular to each other [32].…”

Section: Introductionmentioning

confidence: 99%

Polarization Z-Scan Studies Revealing Plasmon Coupling Enhancement Due to Dimer Formation of Gold Nanoparticles in Nematic Liquid Crystals

Wang,

Lipchus,

Gharbi

et al. 2023

Micromachines

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We investigate the plasmon coupling of gold nanoparticle (AuNP) dimers dispersed in a nematic liquid crystal matrix using the polarization z-scan technique. Our experimental setup includes the precise control of incident light polarization through polarization angles of 0°, 45°, and 90°. Two distinct cell orientations are examined: parallel and twisted nematic cells. In parallel-oriented cells, where liquid crystal molecules and AuNPs align with the rubbing direction, we observe a remarkable 2–3-fold increase in the nonlinear absorption coefficient when the polarization of the incident light is parallel to the rubbing direction. Additionally, a linear decrease in the third-order nonlinear absorption coefficient is noted as the polarization angle varies from 0° to 90°. In the case of twisted nematic cells, the NPs do not have any preferred orientation, and the enhancement remains consistent across all polarization angles. These findings conclusively establish that the observed enhancement in the nonlinear absorption coefficient is a direct consequence of plasmon coupling, shedding light on the intricate interplay between plasmonic nanostructures and liquid crystal matrices.

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Section: Introductionmentioning

confidence: 99%

Polarization Z-Scan Studies Revealing Plasmon Coupling Enhancement Due to Dimer Formation of Gold Nanoparticles in Nematic Liquid Crystals

Wang,

Lipchus,

Gharbi

et al. 2023

Micromachines

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“…With the development of electron devices in recent times, the demand for hightechnology display devices has also increased. Liquid crystal displays (LCDs) have various advantages, such as long-term durability, high resolution, and well-developed production procedures, and have been researched for several decades [1][2][3][4]. Liquid crystals (LCs) are the core material of the LCD.…”

Section: Introductionmentioning

confidence: 99%

Achievement of Unidirectional Aluminum Tin Oxide/UV-Curable Polymer Hybrid Film via UV Nanoimprinting Lithography for Uniform Liquid Crystal Alignment

et al. 2022

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A uniform unidirectional nanostructure composed of aluminum tin oxide and ultraviolet (UV)-curable polymer is introduced herein. The nanostructure was produced by UV-nanoimprint lithography (UV-NIL), and the fabricated hybrid film was used as a uniform liquid crystal (LC) alignment layer. Atomic force microscopy and line profile analysis were performed to confirm a well-ordered nanostructure with 760 nm periodicity and 30 nm height. X-ray photoelectron spectroscopy analysis was also conducted to examine the chemical modifications to the hybrid film surface during UV exposure. Optical transmittance investigation of the nanopatterned hybrid film revealed its compatibility for LC device application. Stable, uniform, and homogeneous LC alignment on the hybrid film was confirmed by polarized optical microscopy observance and analysis of LC pretilt angle. The unidirectional structure on the film surface enabled uniform LC orientation along with surface anisotropy property. Hence, we expect that the proposed UV-NIL process can be applied to fabricate high-resolution unidirectional nanostructures with various inorganic/organic hybrid materials and that these nanostructures have high potential for next-generation LC systems.

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“…For instance, LCs sandwiched between opal crystal thin layers are homeotropically aligned because of the undulated surface topography, 13 improved order parameter (S); 14 carbon nanotube (CNT) doped PI alignment layers with the reconstructed surface topologies, large elastic constant, and large order parameter are efficient to accelerate the switch of LCs; 15,16 the conjugated block copolymer alignment layers with two-dimensionally (2D) networked embedded ultrathin single wall carbon nanotubes (SWNTs) also show significant advantages in superfast switching LCs at lower operating voltage; 17 silver nanoparticle doped PI alignment layers are highly transparent and are able to trap the mobile ions in LCs to reduce the residual direct current; 18 ferroelectric zinc oxide (ZnO) doped PI alignment layers producing the local electric field can trigger the orientation of LCs, and the augmentation of capacitance with the increase in doping concentration also reduces the switching voltage; 19,20 high transparent ferroelectric barium titanate (BaTiO 3 ) nanoparticle doped hybrid alignment layers reduce the Frederik operating voltage and the saturation voltage of LCs. 21 Attractive plasmonic switchable vanadium dioxide (VO 2 ) nanoparticles undergoing the transition from insulating dielectric to conductive metallic state under the thermal or electromagnetic stimulus yield the accumulation or delectation of carriers and show prior advantages in promoting LCs' switching. 22 In this work, VO 2 nanoparticle doped homeotropic polyimide (h-PI) hybrid thin layers were easily prepared by directly mixing VO 2 nanoparticles with h-PI solution and used as alignment layers in flexible LCDs.…”

Section: Introductionmentioning

confidence: 99%

“…Polyimides (PIs) are the most common alignment layers in LCDs because of their excellent dielectric property and super optical performance, but their additional shielding effect on the external electrical field slows down the switch of LCs. , These days nanomaterials are doped in PI alignment layers and show remarkable feasibilities in modulating the alignment of LCs and accelerating their switch. For instance, LCs sandwiched between opal crystal thin layers are homeotropically aligned because of the undulated surface topography, and the LCs sandwiched between SiO 2 doped PI alignment layers are homogeneously aligned in electrically controlled birefringence (ECB) mode with a much higher transmittance because of the improved order parameter ( S ); carbon nanotube (CNT) doped PI alignment layers with the reconstructed surface topologies, large elastic constant, and large order parameter are efficient to accelerate the switch of LCs; , the conjugated block copolymer alignment layers with two-dimensionally (2D) networked embedded ultrathin single wall carbon nanotubes (SWNTs) also show significant advantages in superfast switching LCs at lower operating voltage; silver nanoparticle doped PI alignment layers are highly transparent and are able to trap the mobile ions in LCs to reduce the residual direct current; ferroelectric zinc oxide (ZnO) doped PI alignment layers producing the local electric field can trigger the orientation of LCs, and the augmentation of capacitance with the increase in doping concentration also reduces the switching voltage; , high transparent ferroelectric barium titanate (BaTiO 3 ) nanoparticle doped hybrid alignment layers reduce the Frederik operating voltage and the saturation voltage of LCs …”

Section: Introductionmentioning

confidence: 99%

Vanadium Dioxide Nanoparticle Doped Polyimide Hybrid Alignment Layers for Flexible Liquid Crystal Displays

Liu

Yang

Shi

et al. 2021

ACS Appl. Electron. Mater.

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In this paper, a flexible liquid crystal display (LCD) is developed by applying hybrid alignment layers made of vanadium dioxide (VO 2 ) nanoparticles and homeotropic-polyimide (h-PI) onto colorless plastic substrates, and the proposed hybrid thin layers with randomly embedded agglomerated VO 2 nanoparticles exhibit a transparency over 85% at 550 nm including the substrate and a strong surface irregularity. After rubbing, liquid crystals (LCs) are vertically aligned between the hybrid thin layers with a tilt angle of ∼90°, and due to the significant surface plasmon polariton (SPP) of VO 2 nanoparticles, the switch of LCs under the external electrical field has been remarkably accelerated. The operating voltage to switch LCs in a 5 μm cell assembled using a pair of 0.5% VO 2 nanoparticle doped h-PI hybrid alignment layers has been reduced to 3.536 V, and simultaneously, the decaying time is also shortened more than 18%. Notably, the vertical alignment of LCs was also stabilized under bending thanks to the use of undulating hybrid alignment layers. The fabricated flexible LC cell using 0.5% VO 2 nanoparticle doped h-PI alignment layers yielded good flexibility at a bending radius of 1500 mm without aggravated light leakages and deduced electro-optical performance, and the VO 2 agglomerates hindering the slide of LCs by providing adequate obstructions are believed as the main contributors in firmly stabilizing the vertical alignment of LCs during bending. Compared to micropatterned substrates, ultrathin VO 2 nanoparticle doped h-PI alignment layers employed in flexible LC cells demonstrating their priorities in easy investigation and displaying quality improvement are emerging, highly appreciated, and of great interest for the potential applications in flexible LCDs.

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Effect of ferroelectric nanoparticles in the alignment layer of twisted nematic liquid crystal display

Cited by 31 publications

References 14 publications

Polarization Z-Scan Studies Revealing Plasmon Coupling Enhancement Due to Dimer Formation of Gold Nanoparticles in Nematic Liquid Crystals

Polarization Z-Scan Studies Revealing Plasmon Coupling Enhancement Due to Dimer Formation of Gold Nanoparticles in Nematic Liquid Crystals

Achievement of Unidirectional Aluminum Tin Oxide/UV-Curable Polymer Hybrid Film via UV Nanoimprinting Lithography for Uniform Liquid Crystal Alignment

Vanadium Dioxide Nanoparticle Doped Polyimide Hybrid Alignment Layers for Flexible Liquid Crystal Displays

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