Effect of the grain size on hysteresis of liquid‐crystalline Blue Phase I

Nayek, Prasenjit; Jeong, Heon Yong; Kang, Shin‐Woong; Lee, Seung Hee; Park, Heung‐Shik; Lee, Hyuck Jin; Kim, Hee Seop; Lee, Gi‐Dong

doi:10.1889/jsid20.6.318

Cited by 16 publications

(14 citation statements)

References 32 publications

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“…Therefore, increasing this threshold value V t beyond the maximum voltage V m is a reasonable strategy to reduce Δ V . Successes in reducing Δ V were also reported for particular compositions—including nanoparticle composites—appropriate choice of the curing temperature, or preparation of large BP monodomains …”

Section: Kerr Effect In Polymer‐stabilized Blue Phases: Recent Develomentioning

confidence: 96%

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Polymer‐stabilized blue phases: promising mesophases for a new generation of liquid crystal displays

Nordendorf

Hoischen

Schmidtke

et al. 2014

Polymers for Advanced Techs

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Blue phases—special chiral liquid crystalline mesophases—are promising candidates for electro‐optic devices with improved performance and simplified fabrication. A necessary precondition for possible applications is a significantly enhanced temperature range of their existence, which can be achieved by a cross‐linked polymer network formed by in situ polymerization. Unlike many other mesophases, blue phases are optically isotropic if no voltage is applied. Regarding the transmission of a blue phase cell placed between crossed polarizers, the optical isotropy enables—at least in principle—a perfect dark state, independent of the viewing angle, without the necessity of any alignment layer. The application of an in‐plane electric field induces a strong birefringence (Kerr effect). The effective Kerr constants are much larger than those of isotropic liquids, and the switching times between the dark and the induced bright state are in the submillisecond range. Some basic properties of blue phases, state‐of‐the‐art performance, and remaining challenges of the development of polymer‐stabilized blue phases are reviewed in this article. Copyright © 2014 John Wiley & Sons, Ltd.

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Section: Kerr Effect In Polymer‐stabilized Blue Phases: Recent Develomentioning

confidence: 96%

“…Concerning the field‐induced birefringence, early studies have revealed a field‐induced biaxiality . In addition, some recent studies indicate that a uniform BP alignment can enhance the electro‐optic performance . This finding abates the hope that PSBP can be applied without using any alignment layer.…”

Section: Further Subjects Of Recent Studiesmentioning

confidence: 98%

Polymer‐stabilized blue phases: promising mesophases for a new generation of liquid crystal displays

Nordendorf

Hoischen

Schmidtke

et al. 2014

Polymers for Advanced Techs

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“…The results show that the hysteresis (ΔV50) of the first order diffraction efficiency is ~10 V for 1-D and 2-D BPLC gratings, which corresponds to ~6.67% of the voltage of maximum diffraction efficiency (Vmax ~ 150 V). The small hysteresis observed is due to the large domain size (over 50 μm) of the BPLC sample [31], and the operating temperature of the BPLC grating is close to the temperature of phase transition between BPI and blue phase II (BPII) (~45.5 °C) [30]. However, a method can be utilized to reduce the hysteresis, such as using the BPLC sample with a temperature in the BPII range [30], polymer stabilized blue phase liquid crystal (PSBPLC) [32][33][34], and elliptical protrusion electrodes [35].…”

Section: Resultsmentioning

confidence: 94%

Switchable Two-Dimensional Liquid Crystal Grating in Blue Phase

Huang

Lin

et al. 2017

Crystals

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Abstract:We demonstrate a switchable two-dimensional phase grating in blue phase liquid crystal (BPLC), which is fabricated by sawtooth in-plane-switch (IPS) electrodes. They are used to generate the horizontal electric field on a single indium-tin-oxide (ITO) glass substrate and, as a result, the 1-D and 2-D phase gratings can be mutual switched via different polarizations of incident light with an applied voltage. The first-order diffraction efficiency is up to 20% and 10% for the 1-D and 2-D phase grating at V = 150 V, respectively. Moreover, the rise and decay time is 0.9 and 1.1 ms, respectively, which is suitable for wide applications of high-speed optical manipulations.

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“…Hysteresis can be seen as an outcome of an electrically disturbed BPs. Several reports have confirmed that both orientating and growing large platelets have positive impacts on the elimination of hysteresis [80,128].…”

Section: Optical Isotropy and Fast Electro-optic Responsementioning

confidence: 89%

Self-Organized 3D Photonic Superstructure: Blue Phase Liquid Crystal

Lin

Chen

2015

Anisotropic Nanomaterials

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Blue phase liquid crystals (BPLCs) have attracted considerable attention in recent years owing to their unique periodic structure and electro-optic properties. Besides the potential applications in the next generation display, BPLC with a cubic lattice structure can be regarded as a self-organized three-dimenstional (3D) photonic crystal that can be applied for photonic devices such as optical filter, optical attenuator, phase modulator, laser source and so on. This chapter will introduce the formation of BPLCs from both theoretical and experimental points of view. The stability and temperature range of BPLCs are also discussed followed by its photonic crystal structure, lattice orientation and phase identification. After a basic overview, this chapter will further introduce the applications of BPLCs, including controllability of photonic band gap with external fields, fast electro-optic Kerr effect, and optical nonlinear effect. This short summary shows that the century old intriguing BPLCs have diverse opportunities to offer in modern photonic materials and devices. Moreover, the current challenges in this area are expected to spark innovative ideas leading toward the design and engineering of new chiral materials that may furnish suitable BPLCs to produce advanced photonic materials that have desirable properties and functions.

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Effect of the grain size on hysteresis of liquid‐crystalline Blue Phase I

Cited by 16 publications

References 32 publications

Polymer‐stabilized blue phases: promising mesophases for a new generation of liquid crystal displays

Polymer‐stabilized blue phases: promising mesophases for a new generation of liquid crystal displays

Switchable Two-Dimensional Liquid Crystal Grating in Blue Phase

Self-Organized 3D Photonic Superstructure: Blue Phase Liquid Crystal

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