Reversible and fast shift in reflection band of a cubic blue phase in a vertical electric field

Chen, Hui-Yu; Chiou, Ji-Yi; Yang, Kai-Xian

doi:10.1063/1.3658960

Cited by 20 publications

(16 citation statements)

References 12 publications

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“…As the applied voltage was increased, the various colors switching of blue, green, and red corresponding to a continuous shift of Bragg wavelength under the electric field were observed. The color switching times from green to red have been experimentally proven to be of millisecond order 34, 88. The shift ranges and the switching times for BPs were comparable to those of polymer‐stabilized N* systems 89, 90…”

Section: Resultsmentioning

confidence: 85%

Dendron‐Stabilized Liquid Crystalline Blue Phases with an Enlarged Controllable Range of the Photonic Band for Tunable Photonic Devices

Shibayama

Higuchi

Okumura

et al. 2012

Adv Funct Materials

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Liquid crystalline blue phases (BPs) show excellent potential for application in tunable photonic devices because they possess the unique optical property that the selective 3D Bragg diffraction in a visible wavelength region can be continuously shifted using an electric fi eld. A new approach to simultaneously extend the wavelength range of fi eld-induced Bragg diffraction shift and the temperature range of thermodynamically stable BPs is critically needed. Here, a new BP material system is shown using a dendron molecule to extend simultaneously the two BP ranges. One is the temperature range of thermodynamically stable BPs, which is expanded from 2.1 to 4.6 ° C. The other is the reversible maximum shift range of Bragg wavelength on the electric fi eld, which is extended from 85 to 109 nm. The physical mechanism of the dendron-stabilizing effect in BPs is discussed in terms of elastic property and orientational order of liquid crystal molecules.

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Section: Resultsmentioning

confidence: 85%

Dendron‐Stabilized Liquid Crystalline Blue Phases with an Enlarged Controllable Range of the Photonic Band for Tunable Photonic Devices

Shibayama

Higuchi

Okumura

et al. 2012

Adv Funct Materials

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“…From these previous studies, we can conclude the following experimental characteristics of BPIII: (1) BPIII is stabilized by strong chirality and usually occupies a temperature range of $0.1 C just below the isotropic phase; 4 (2) BPIII is strongly optically active; (3) BPIII reflects a very weak and broad region at short wavelengths, which depends on the chirality of the liquid crystals; 5 (4) the latent heat of BPIII is larger by an order of magnitude than other phase transitions 6 such as N* to BPI or BPI to BPII; and (5) BPIII is only weakly affected by moderate electric fields; 3,5,6 (6) because of the Kerr effect, BPIII can be switched between optical isotropy and anisotropy under an in-plane field. 7,8 In our previous study, 9 we found that for cubic BPI the reflection spectra can be changed by applying an external field. As the external field increases, the reflected peak shifts to a long or short wavelength, depending on the directions of the electric field and lattice surface and the dielectric anisotropy of the LC materials.…”

Section: Introductionmentioning

confidence: 88%

“…5 The wavelength shift of BPI in the field can be larger than 40 nm, and the intensity of the reflection does not change obviously. 9 This means that BPI can be used as a wavelength-tunable reflector.…”

Section: Introductionmentioning

confidence: 99%

Fast tunable reflection in amorphous blue phase III liquid crystal

Chen

Lai

Chan

et al. 2013

Journal of Applied Physics

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The dynamic reflection spectra of amorphous blue phase III were investigated. When an electric field is applied to a blue phase III cell, the reflected wavelength does not shift obviously, but the intensity of reflection increases or decreases in a few ms. This fast intensity-tunable phenomenon in blue phase III relates to the dielectric anisotropies and chiralities of the liquid crystal and can be explained by the double twist model consisting of randomly orientated double-twisted cylinders. This study shows that blue phase III can act as a fast intensity-tunable reflector for a specific wavelength. V

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“…According to arrangements of the DTCs and the disclination lines, three structurally distinct types of blue phase are identified: BP III, BP II, and BP I, appearing in order of decreasing temperature from the isotropic phase. BPIII exhibits a disordered structure [1,2]; BPI and BPII display high-ordered lattice structures, giving rise to unusual physical properties, including a fast electro-optical response [3,4] and Bragg reflection of visible light [5]. These characteristics make BPI and BPII very promising materials for prospective applications in novel displays and photonic technology [6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Optical polarization states of a liquid-crystal blue phase II

Chen

2019

OSA Continuum

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The advantages and uniqueness of blue-phase-based electro-optical devices are predicted. In this paper, we present relevant electro-optics behaviors of the transmitted and reflected lights of BPII and try to explain those phenomena through studying the polarization states of the lights. There are two stages of electro-optical behaviors seen in an in-plan-switching BPII cell. Because of the Kerr effect, the birefringence of the linear polarized light is induced and saturated 0.021 at 150 V, and the Kerr constant is ≈ 3 × 10 −10 mV −2. As the applied voltage is stronger (>200 V), the influence of the deformation of the lattice structure dominates the transmitted/reflected intensity at different wavelengths, which causes a discontinuous change in the transmitted light intensity and a huge variation in the azimuth angle (80 •) of the polarization state of the transmitted light. As a result the deformation of the lattice structure of the BPII not only induces a linear birefringence but also induces a change in optical rotatory power and then affects the polarization state of the light. These experimental results show that the electro-optical nature of the BPII cell is more complicated than the well-known BPI phase. They also show that BPII can be used not only in transflective devices, but also in field-tunable optical devices.

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Reversible and fast shift in reflection band of a cubic blue phase in a vertical electric field

Cited by 20 publications

References 12 publications

Dendron‐Stabilized Liquid Crystalline Blue Phases with an Enlarged Controllable Range of the Photonic Band for Tunable Photonic Devices

Dendron‐Stabilized Liquid Crystalline Blue Phases with an Enlarged Controllable Range of the Photonic Band for Tunable Photonic Devices

Fast tunable reflection in amorphous blue phase III liquid crystal

Optical polarization states of a liquid-crystal blue phase II

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