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

Shibayama, Seishi; Higuchi, Hiroki; Okumura, Yasushi; Kikuchi, Hirotsugu

doi:10.1002/adfm.201202497

Cited by 38 publications

(32 citation statements)

References 95 publications

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“…An impressive progress was observed when k 33 is smaller than k 11 , which matched the theoretical predictions [46,47]. This was also confirmed experimentally by Shibayama et al, adopting a dendron to modulate the elastic properties [48]. According to Fukuda et al [47], the temperature range can be estimated by extending Meiboom's defect model with an additional term describing DTC's elastic energy, given by:…”

Section: Expansion Of Temperature Range Of Bpssupporting

confidence: 70%

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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Section: Expansion Of Temperature Range Of Bpssupporting

confidence: 70%

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

Lin

Chen

2015

Anisotropic Nanomaterials

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“…The BPI, which appeared at a lower temperature range upon cooling, was not observed upon heating. The thermodynamic equilibrium phase transition points are better reflected during the heating process rather than during cooling, as supercooling readily occurs with the latter [20]. At temperatures > 68°C, the Bragg reflection wavelength gradually increased with the temperature.…”

Section: Resultsmentioning

confidence: 99%

A monodomain-like liquid-crystalline simple cubic blue phase II

Kim

et al. 2015

Journal of Information Display

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In this work, a systematic approach to controlling the orientation of a liquid-crystalline simple cubic blue phase (BPII) was carried out using a conventional surface rubbing treatment method. A more uniform lattice plane alignment in BPII was produced than in the liquid-crystalline-body-centered blue phase (BPI) using rubbed polyimide (PI) films on glass substrates. A single-color monodomain-like BPII was achieved regardless of the rubbed PI substrate pretilt angle. Additionally, singlecolor monodomain-like BPIIs with three elementary colors (red, green, and blue) were prepared, simply by changing the percentage of the chiral dopant.

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“…[4,5] At the same time, many other research groups are motivated to make efforts to achieve stable BPs in wide temperature range. These efforts, which are mainly chemical approaches, include new designs of unconventional molecules such as dimers, [6] Tshaped, [7] U-shaped, [8] dendron, [9] hydrogen-bonded, [10] and bent-core molecules, [11][12][13] or the use of nano-particles. [14,15] It was also shown experimentally by Miller et al and Hur et al, [16] and then theoretically, [17] that al ow bend elastic constant K 33 is the key for BPs' thermals tability.…”

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confidence: 99%

Unusual Electro‐Optic Kerr Response in a Self‐Stabilized Amorphous Blue Phase with Nanoscale Smectic Clusters

Hafuri

Ocak

et al. 2016

ChemPhysChem

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We investigated the electro-optic response in the "foggy" amorphous blue phase (BPIII) as well as in the isotropic phase. To the best of our knowledge, such a study has not yet been performed due to the very limited thermal range of BPIII. In this study, we used a single-component chiral bent-core liquid crystal with a self-stabilized BPIII, which is stable over a wide temperature range. The results show that the response time is on the order of hundreds of microseconds in the isotropic phase and increases to 1-2 ms in the BPIII (at TI-BP -T <1), then drastically increases up to a few tens of milliseconds upon further cooling in BPIII. Such an unusual behavior was explained on the basis of the high rotational viscosity and/or the existence of nanoscale smectic (Sm) clusters. The Kerr constant was also measured and found to be ∼500 pm V(-2) , which is the largest among bent-core BP systems reported so far and comparable with that of polymer-stabilized BPs.

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

Cited by 38 publications

References 95 publications

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

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

A monodomain-like liquid-crystalline simple cubic blue phase II

Unusual Electro‐Optic Kerr Response in a Self‐Stabilized Amorphous Blue Phase with Nanoscale Smectic Clusters

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