Polymer network liquid crystal grating/Fresnel lens fabricated by holography

Huang, Shuaijia; Li, Yan; Zhou, Pengcheng; Liu, Shuxin; Su, Yikai

doi:10.1080/02678292.2016.1254295

Cited by 8 publications

(5 citation statements)

References 36 publications

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“…Beam deflection by voltage driven bent-align cell was achieved in positive 21 and negative 22 birefringence liquid crystal cells. Different experimentally realisable structures for electrically tunable LC lenses were reported 71 , 72 , such as curved lens 73 , gradient index (GRIN) lens 74 , Fresnel type lens 75 , multi-layered lens 76 and polymer dispersed liquid crystal PDLC lens 77 . Overall, there is exciting—experimental and theoretical—progress realising beam and light steering with liquid crystals, typically relying on manipulation of single liquid crystals layers, which could be adapted and used for design of also multi-layered nematic devices.…”

Section: Towards Experimental Realisationmentioning

confidence: 99%

Controllable shifting, steering, and expanding of light beam based on multi-layer liquid-crystal cells

Mur

Ravnik

Seč

2022

Sci Rep

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Shaping and steering of light beams is essential in many modern applications, ranging from optical tweezers, camera lenses, vision correction to 3D displays. However, current realisations require increasingly greater tunability and aim for lesser specificity for use in diverse applications. Here, we demonstrate tunable light beam control based on multi-layer liquid-crystal cells and external electric field, capable of extended beam shifting, steering, and expanding, using a combination of theory and full numerical modelling, both for liquid crystal orientations and the transmitted light. Specifically, by exploiting three different function-specific and tunable birefringent nematic layers, we show an effective liquid-crystal beam control device, capable of precise control of outgoing light propagation, with possible application in projectors or automotive headlamps.

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Section: Towards Experimental Realisationmentioning

confidence: 99%

Controllable shifting, steering, and expanding of light beam based on multi-layer liquid-crystal cells

Mur

Ravnik

Seč

2022

Sci Rep

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“…To develop electrically switchable LC FZP, scholars have established numerous methods, including UV-modified alignment films 20 , 21 , patterned electrodes 20 , polymer and blue phase LC composite (PBPLC) 22 , polymer network LCs (PNLCs) 23 , 24 , polymer-dispersed LCs (PDLCs) 25 , and photoaligned dye-doped LCs (DDLCs) 26 . The development of PDLC and PNLC devices is straightforward, but they consistently exhibit high light scattering behavior, lowering the FZPs’ resolving power.…”

Section: Introductionmentioning

confidence: 99%

Adaptive focal lengths in white light focusing Fresnel lenses enabled by reflective-type and phase-only spatial light modulator

Selvaraj,

Wang,

Hou

et al. 2023

Sci Rep

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Fresnel zone plates (FZPs) are widely used in integrated optical systems to meet new cutting-edge demands for photonic integration and device miniaturizing. However, their use in applications of cross-scale fabrication still faces several obstacles, such as low efficiency, fixed focal length, single wavelength, large size, and complicated fabrication. Here, we first examine a novel adaptive focal length in white light focusing by using reflective-type and phase-only spatial light modulator (RLC-SLM) based on a liquid crystal on silicon. The device achieves a maximum diffraction efficiency of approximately 38% at primary focal points of binary phase-type FZPs throughout the visible range (red, green, and blue wavelengths). The RLC-SLM focuses the light of the desired wavelength while other sources are defocused. White light focusing and color separation are demonstrated by sequentially and additively switching different FZPs. These recent advances show that optically tunable FRZs are promising potential candidates to enhance adaptive camera systems, microscopes, holograms, and portable and wearable devices, thereby opening up novel possibilities in optical communications and sensing.

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“…In a nematic LC, a relatively large layer thickness of the LC can be preferable to achieve high optical-phase modulation. However, by increasing the layer thickness, also the response times of LC devices can be significantly delayed . To achieve fast response times, LC composites such as polymer-dispersed liquid crystals (PDLC), − polymer-stabilized blue-phase liquid crystals (PS-BPLC), , and polymer network liquid crystals (PNLC) are investigated.…”

Section: Introductionmentioning

confidence: 99%

“…However, by increasing the layer thickness, also the response times of LC devices can be significantly delayed . To achieve fast response times, LC composites such as polymer-dispersed liquid crystals (PDLC), − polymer-stabilized blue-phase liquid crystals (PS-BPLC), , and polymer network liquid crystals (PNLC) are investigated. Highly versatile PDLC films can be easily processed. , However, several trade-offs (low diffraction efficiencies and depolarization of light make them an inappropriate candidate for this regime) have limited the use of PDLCs for applications in diffraction gratings .…”

Section: Introductionmentioning

confidence: 99%

“…However, by increasing the layer thickness, also the response times of LC devices can be significantly delayed. 18 To achieve fast response times, LC composites 19 such as polymer-dispersed liquid crystals (PDLC), 20−22 polymerstabilized blue-phase liquid crystals (PS-BPLC), 13,14 and polymer network liquid crystals (PNLC) 18 are investigated. Highly versatile PDLC films can be easily processed.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Tunable Diffraction Gratings in Copolymer Network Liquid Crystals Driven with Interdigitated Electrodes

Habibpourmoghadam

Wolfram

Jahanbakhsh

et al. 2019

ACS Appl. Electron. Mater.

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The diffraction behavior of a polymer network liquid crystal (PNLC) was studied in in-plane switching (IPS) test cells and compared to the behavior seen in a neat liquid crystal. Due to the presence of polymer, the diffraction behavior was varied drastically: PNLCs are composites, which possess a specific domain size. The size of such polymer-induced domains was investigated with polarized optical microscopy and scanning electron microscopy. PNLCs are capable of continuous opticalphase modulation. It was found that electrical addressing with nonhomogenous electric fields can be useful to vary the phase modulation profile as compared to a neat LC. The diffraction patterns seen in a nematic LC were influenced by the applied addressing voltage and showed some limited tunability already. However, in the PNLC, the diffraction patterns were drastically varied as compared to a neat nematic LC. These gratings showed responses localized to the electrodes, had higher tuneability, and could also be useful to partially suppress the zerothdiffraction order. Depending on the applied voltage, the diffraction efficiency could be tuned, efficiently. The presented results are instructive to understand the impact of a polymer network on the field-dependent reorientation of the liquid crystal director: if addressed with the same electric field profile, the responses were much more localized than in a neat nematic LC. In a straightforward numerical approach, domains in the PNLC samples were described by using cuboids. Diffraction patterns were then calculated based on the director reorientations seen and compared to the experimental data.

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Polymer network liquid crystal grating/Fresnel lens fabricated by holography

Cited by 8 publications

References 36 publications

Controllable shifting, steering, and expanding of light beam based on multi-layer liquid-crystal cells

Controllable shifting, steering, and expanding of light beam based on multi-layer liquid-crystal cells

Adaptive focal lengths in white light focusing Fresnel lenses enabled by reflective-type and phase-only spatial light modulator

Tunable Diffraction Gratings in Copolymer Network Liquid Crystals Driven with Interdigitated Electrodes

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