Fast response dual-frequency liquid crystal switch with photo-patterned alignments

Lin, Xiao-wen; Hu, Wei; Hu, Xi-kui; Liang, Xiao; Chen, Ye; Cui, Hongqing; Zhu, Ge; Li, Jianan; Chigrinov, Vladimir G.; Lu, Yanqing

doi:10.1364/ol.37.003627

Cited by 49 publications

(27 citation statements)

References 17 publications

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“…The phase retardation has not reached one π so that the intensity of 0th or 1st order does not exhibit an extremum. However, the diffraction efficiency of 1st order (defined as the ratio between the intensity of 1st order and total transmitted) has still reached up to 38.7% at 55 V, comparable to that reported with a phase retardation of π (40% at 160 V) [37] . This indicates the diffraction intensity here is very close to a maximum.…”

supporting

confidence: 84%

“…For common nematic LCs, it is usually limited to the level of tens of milliseconds [35,36] . For fast tuning purpose, several special materials like ferroelectric LCs [34] and dual frequency LCs [37] have been raised to shorten the response time. BP LCs also show a possibility of submilisecond response, and grating designs based on this material are also proposed [38] .…”

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confidence: 99%

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Brief review of recent research on blue phase liquid crystal materials and devices

Zheng¹,

Zhu²,

Sun³

et al. 2013

中国光学快报

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Both polymer stabilization and bent-shaped molecule doping strategies are utilized to widen the blue phase range of liquid crystals. The molecular structures of compositions are optimized for high thermooptical and electro-optical performances. A low temperature applicable blue phase liquid crystal with suppressed hysteresis is achieved. The bistability of one blue phase liquid crystal is investigated. Based on these materials, fast tunable devices such as gratings with polarization insensitivity are designed and fabricated. The materials and device designs demonstrated here are suitable in wide applications requiring fast response time.OCIS codes: 160.3710, 050.1950, 160.4670. doi: 10.3788/COL201311.011601. It is well known that the nematic, smectic, and cholesteric are three typical phases of the conventional liquid crystals (LCs). The blue phase (BP) is also a special LC phase which normally exists in the materials with large twisted power. When such material is cooled down, many colorful platelet textures can be found in a very narrow temperature range (1-2 K) between the isotropy and chiral nematic phases, that is the BP [1] . Many theoretical analysis and experimental phenomenon have revealed that LC alignment in BP is complex and exotic. Not like the single twisted assembling in cholesteric phase, LC molecules are double twisted assembled in BP. The two twisted axes are crossed with each other and form the double twisted cylinders (DTCs). These DTCs can either exist in disordered distribution, exhibiting a fog-like texture (BP III), or self-assemble into three-dimensional (3D) crystals, showing colorful platelet textures (BP I and BP II) due to the selective Bragg reflections [2,3] . The unique structure of BP LC endows it with some interesting characteristics, such as optical isotropy at voltage off state, fast response time down to submillisecond, which are much benefit for the next generation of display and photonic devices [4−10] . Although BP LC was found a century ago, it was failed to be applied realistically for quite a long time due to its instinct problems, especially its narrow temperature range. Many efforts have been made to overcome this shortage. Some great improvements have been achieved during the last decade. The first promising wide temperature range BP was demonstrated by Kikuchi et al. [11] . They uniformly mixed acrylate based monomers into chiral nematic LCs, and then exposed the mixture under UV at BP state to polymerize the monomers. Finally, the BP was stabilized by polymer network, and the BP range was extended to over 60 • C. This is the so called polymer stabilized BP (PSBP). The mechanism of PSBP is that the polymer forms a stable 3D framework and stabilizes the defects in the frustration BP system. After this strategy was established, especially after Samsung exhibited the first BP LC display (LCD) at SID Display Week in Los Angeles, in 2008, more and more attentions had been attracted by the promising materials. Wu's group [12] has made great contributions to the impro...

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confidence: 84%

mentioning

confidence: 99%

Brief review of recent research on blue phase liquid crystal materials and devices

Zheng¹,

Zhu²,

Sun³

et al. 2013

中国光学快报

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“…here  is the rotational viscosity, K is the elastic constant, and d is the cell thickness [1]. One of the effective approaches to accelerate the process is to use the so-called dual-frequency nematic liquid crystal (DFLC) in which 0   at field frequencies below some cross-over frequency c f and 0   above c f [2][3][4][5][6]. To achieve a sub-millisecond switching time, Golovin et al [2] and Yin et al [3] proposed to use a DFLC in a high-pretilt cell.…”

Section: Introductionmentioning

confidence: 99%

Dye-doped dual-frequency nematic cells as fast-switching polarization-independent shutters

Li¹,

Xiao²,

Paladugu³

et al. 2019

Opt. Express

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We present polarization-independent optical shutters with a sub-millisecond switching time. The approach utilizes dual-frequency nematics doped with a dichroic dye. Two nematic cells with orthogonal alignment are driven simultaneously by a low-frequency or highfrequency electric field to switch the shutter either into a transparent or a light-absorbing state. The switching speed is accelerated via special short pulses of high amplitude voltage. The approach can be used in a variety of electro-optical devices.

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“…[1][2][3][4][5] In contrast to classical nematic liquid crystals (NLCs) in DFNLCs, dielectric anisotropy (Δε) varies with frequency. As a rule, at room temperature, Δε is positive (Δε > 0) at low frequency, while above crossover frequency (f C ) (the frequency at which dielectric anisotropy falls to zero) is negative (Δε < 0).…”

Section: Introductionmentioning

confidence: 99%

Dielectric behaviour of binary dual-frequency nematics with low crossover frequencies

2015

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Binary dual-frequency nematic liquid crystals synthesised at the Military University of Technology were measured by dielectric means. All the investigated materials exhibit low crossover frequency. They were composed of only two molecules with longitudinal and transverse dipole moments. The main difference is the molecular weight of the molecules. Results of relaxation parameters of detected mode and crossover frequency are shown. The influence of structure on ion conductivity is discussed. The broad phase transition from an isotropic phase to a nematic one was observed.

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Fast response dual-frequency liquid crystal switch with photo-patterned alignments

Cited by 49 publications

References 17 publications

Brief review of recent research on blue phase liquid crystal materials and devices

Brief review of recent research on blue phase liquid crystal materials and devices

Dye-doped dual-frequency nematic cells as fast-switching polarization-independent shutters

Dielectric behaviour of binary dual-frequency nematics with low crossover frequencies

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