Reconfiguration of three-dimensional liquid-crystalline photonic crystals by electrostriction

Guo, Duan Yi; Chen, Chun-Wei; Li, Cheng Chang; Jau, Hung Chang; Lin, Keng Hsien; Feng, Ting Mao; Wang, Chun-Ta; Bunning, Timothy J.; Khoo, Iam Choon; Lin, Tsung‐Hsien

doi:10.1038/s41563-019-0512-3

Cited by 90 publications

(65 citation statements)

References 44 publications

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“…Liquid crystals are crucial for challenging chapters of physics, chemistry, and modern biology [1][2][3][4][5][6][7]. They are also omnipotent for a variety of applications, mainly displays used from smartphones to computers and TV sets [8,9]. As the most classical liquid crystalline material, one can indicate pentylcyanobiphenyl (5CB)-the rod-like compound with the permanent dipole moment (µ ≈ 5 D) approximately parallel to the long molecular axis [3].…”

Section: Introductionmentioning

confidence: 99%

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‘Quasi-Tricritical’ and Glassy Dielectric Properties of a Nematic Liquid Crystalline Material

Drozd-Rzoska

2020

Crystals

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Results of dielectric studies in the nematic and isotropic liquid phases of pentylcyanobiphenyl (5CB), a model rod-like liquid crystalline material, are shown. They are based on the discussion of the evolution of dielectric constant ( ε ), its changes under the strong electric field (nonlinear dielectric effect, NDE), and finally, the primary relaxation time. It is shown that changes in ε T and NDE are entirely dominated by the impact of pretransitional fluctuations (pre-nematic and pre-isotropic, respectively) which are associated with the weakly discontinuous character of the isotropic–nematic phase transition. This influence also extends for the low-frequency, ionic species dominated, region. Notable, that the derivative-based and distortions sensitive analysis revealed the tricritical nature of the I-N transition. Although the glass transition in 5CB occurs in the deeply supercooled state at T g ≈ − 68 ° C , the dynamics (changes of the primary relaxation time) follow a previtreous pattern both in the isotropic and in the nematic phase. Finally, the discussion of the ’molecular’ vs. ‘quasi-critical’ characterizations of the isotropic and nematic phases is presented. It shows the evident prevalence of the ‘quasi-critical-picture’, which offers the consistent temperature parameterization in the total tested temperature range.

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Section: Introductionmentioning

confidence: 99%

“…Concluding, rod-like liquid crystalline materials with the nematic phase are considered as the experimental model-system for the fundamental insights and society-important applications [1][2][3][4][5][6][7][8][9][10][11]. Notwithstanding, some of their essential properties remain surprisingly puzzling, as indicated above.…”

Section: Introductionmentioning

confidence: 99%

‘Quasi-Tricritical’ and Glassy Dielectric Properties of a Nematic Liquid Crystalline Material

Drozd-Rzoska

2020

Crystals

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“…BPs hold a prominent position among liquid-crystalline phases due to their high potential for applications [70,71]. The defect lattices could be used for assembly of NPs in regular templates or tuned by external fields [37,50,71]. Among various approaches, the nanoparticledriven BP stabilization has attracted considerable interest over the last 10 years.…”

Section: Discussionmentioning

confidence: 99%

Quantum Dot-Driven Stabilization of Liquid-Crystalline Blue Phases

et al. 2020

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Liquid crystals hosting nanoparticles comprise a fascinating research field, ranging from fundamental aspects of phase transitions to applications in optics and photonics. Liquid-crystalline phases exhibit topological defects that can be used for assembly of nanoparticles in periodical arrays, and at the same time, the nanoparticles can increase the stability range of liquid-crystalline phases. This has been experimentally demonstrated over the past few years in the case of blue phases that are present in some strongly chiral liquid crystals. Experimental results in quantum dot-driven blue phase stabilization are presented here by means of high-resolution calorimetry and polarizing optical microscopy. It is demonstrated that quantum dots essentially stabilize the macroscopically amorphous blue phase III. There are discussed similarities and differences between the effects of spherical and anisotropic nanoparticles on blue phase stabilization; moreover, future prospects and trends in the field are addressed.

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“…[ 5–8 ] The relationship between the reflection peak position (λ) of structural color and the above‐mentioned parameters follows Bragg's law

(λ = 2 d \sqrt{n^{2} - {sin}^{2} α})

. [ 9–11 ] Based on Bragg's law, the change of lattice parameter can cause the change of structural color, which leads to the development of responsive photonic crystals. [ 12–14 ]…”

Section: Introductionmentioning

confidence: 99%

Thermal Responsive Photonic Crystal Achieved through the Control of Light Path Guided by Phase Transition

Liu

Zhang

Yao

et al. 2020

Small

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Responsive photonic crystal is widely considered in the field of anti‐counterfeiting and information encryption because of their structural color changes caused by external stimulation. However, the response signal is usually achieved by adjusting the periodic lattice constant based on Bragg's law with volume changes. Thus, it is a great challenge to achieve the response of photonic crystals by non‐array parameter control. Herein, novel thermal responsive photonic crystal (TRPC) with low angle dependent structural color is fabricated by introducing poly(ethylene glycol) into the structure of low angle dependent SnO2 inverse opal. The response is achieved through the control of light path guided by phase transition and the significant volume change caused by the change of traditional array parameters can be effectively avoided. Meanwhile, the low angle dependent structural color of TRPC can effectively reduce the interference of observation angle change to response signal caused by external thermal stimulation. Patterned responsive photonic crystals with temperature gradient response are easily obtained by combining confinement self‐assembly and direct template method, and the patterns can be presented and hidden by the control of light path, showing great potential in anti‐counterfeiting and information encryption fields.

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Reconfiguration of three-dimensional liquid-crystalline photonic crystals by electrostriction

Cited by 90 publications

References 44 publications

‘Quasi-Tricritical’ and Glassy Dielectric Properties of a Nematic Liquid Crystalline Material

‘Quasi-Tricritical’ and Glassy Dielectric Properties of a Nematic Liquid Crystalline Material

Quantum Dot-Driven Stabilization of Liquid-Crystalline Blue Phases

Thermal Responsive Photonic Crystal Achieved through the Control of Light Path Guided by Phase Transition

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