Fast tunable reflection in amorphous blue phase III liquid crystal

Chen, Hui-Yu; Lai, Jia-Liang; Chan, Chun-Cheng; Tseng, C.-T.

doi:10.1063/1.4797492

Cited by 16 publications

(13 citation statements)

References 11 publications

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“…Besides thermal stability, electo-optical properties of BPIII was investigated [156–161] due to the following advantages over cubic BP, i.e. (a) hysteresis free characteristics, (b) small residual birefringence, (c) lower threshold and saturated voltages, and (d) higher stability against an electric field [162].…”

Section: Recent Developments In Amorphous Bp III Lcmentioning

confidence: 99%

Blue phase liquid crystal: strategies for phase stabilization and device development

Rahman

Said

Balamurugan

2015

Science and Technology of Advanced Materials

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The blue phase liquid crystal (BPLC) is a highly ordered liquid crystal (LC) phase found very close to the LC–isotropic transition. The BPLC has demonstrated potential in next-generation display and photonic technology due to its exceptional properties such as sub-millisecond response time and wide viewing angle. However, BPLC is stable in a very small temperature range (0.5–1 °C) and its driving voltage is very high (∼100 V). To overcome these challenges recent research has focused on solutions which incorporate polymers or nanoparticles into the blue phase to widen the temperature range from around few °C to potentially more than 60 °C. In order to reduce the driving voltage, strategies have been attempted by modifying the device structure by introducing protrusion or corrugated electrodes and vertical field switching mechanism has been proposed. In this paper the effectiveness of the proposed solution will be discussed, in order to assess the potential of BPLC in display technology and beyond.

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Section: Recent Developments In Amorphous Bp III Lcmentioning

confidence: 99%

Blue phase liquid crystal: strategies for phase stabilization and device development

Rahman

Said

Balamurugan

2015

Science and Technology of Advanced Materials

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“…A large-scale computer simulation and the experimental results of BPIII provide strong evidence that BPIII should be formed by an amorphous network of the disclination and the randomly-distributing DTCs, and they also show that an electric field can order the directions of the DTCs in amorphous BPIII [8,9]. Compared to the electro-optical properties of BPI and BPII, BPIII exhibits a fast response with no residual birefringence, and there is no hysteresis effect when an in-plane electric field is applied [10,11]. Moreover, a transflective device without an internal reflector using a room-temperature BPIII material is demonstrated [12].…”

Section: Introductionmentioning

confidence: 78%

“…The diameter of the DTC can be estimated from the pitch of the BPIII, which is obtained from the reflection spectrum (P = λ/n). The reflection wavelength of the BPIII is usually shorter than 450 nm and the average refractive index of LC is 1.6, thus we can estimate the pitch, which is shorter than 282 nm [10]. However, the diameter of the DTC is a quarter of the pitch and is about 70 nm.…”

Section: Resultsmentioning

confidence: 98%

“…Yet, these experimental results and discussion allowed us to unravel the mystery of the amorphous BPIII step by step. They taught us why BPIII possesses an achromatic dark state, hysteresis-free, and sub-millisecond switching [2,10]. BPIII will go a long way in contributing to the technical evolution of liquid crystal displays with high contrast ratios and wide viewing angles.…”

Section: Discussionmentioning

confidence: 99%

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Symmetry Breaking Induced Pockels Effect in a Tilted Field Switching BPIII Cell

Chen

Wang

2019

Crystals

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In this study, we propose driving the amorphous blue phase III (BPIII) with a tilted electric field to enhance or magnify its inherent linear electro-optical properties. The electro-optical properties of in-plane-switching (IPS) BPIII and tilted-field-switching (TFS) BPIII cells are compared here. According to the change in the induced birefringence with varying the strength of the electric field in the TFS-BPIII cell, the Kerr effect occurs in the low electric field and the Pockels effect dominates in the high electric field. In addition, the transmittance of the TFS-BPIII cell depends on the polarity of the applied field from 1 Hz to 10 kHz. It also results in the rise time of the TFS-BPIII cell being almost half of that of the IPS-BPIII cell. These experimental results and discussion allowed us to unravel the mystery of the amorphous BPIII step by step and provide the potential application of BPIII in photonic devices.

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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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Fast tunable reflection in amorphous blue phase III liquid crystal

Cited by 16 publications

References 11 publications

Blue phase liquid crystal: strategies for phase stabilization and device development

Blue phase liquid crystal: strategies for phase stabilization and device development

Symmetry Breaking Induced Pockels Effect in a Tilted Field Switching BPIII Cell

Optical polarization states of a liquid-crystal blue phase II

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