scholarly journals All-Optically Controllable Photonic Crystals Based on Chiral-Azobenzene-Doped Blue Phase Liquid Crystals

Crystals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 906
Author(s):  
Shun-An Jiang ◽  
Chan-Hong Wu ◽  
Ting-Shan Mo ◽  
Shuan-Yu Huang ◽  
Jia-De Lin ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Photonic Crystals ◽  
Optical Control ◽  
Light Illumination ◽  
Homogeneous Surface ◽  
Surface Alignment ◽  
All Optical ◽  
Phase Liquid ◽  
Blue Phase ◽  
The Difference

In this study, the all-optical control properties of photonic crystals based on self-assembled chiral-azobenzene-doped blue phase liquid crystals (CA-BPLCs) were investigated. The difference in the photothermal characteristics of CA-BPLCs with and without homogeneous surface alignment was discussed. Results revealed that surface alignment could induce more uniform and diverse blue phase (BP) structures, including BPII, BPI, and BPS-like phases during cooling. Consequently, the temperature range of BP was wider than that of the sample without surface alignment. All-optical control experiments with light illumination were then performed on the aligned or nonaligned CA-BPLC samples. During continuous irradiation with light beams at wavelengths of 405 and 450 nm, CA dopants underwent trans→cis and cis→trans back photoisomerizations, respectively. These processes promoted isothermal phase transition and wavelength shifting, which further enabled the all-optical control of the CA-BPLC samples. Various optical control modes of BPLC could be achieved through phase change and wavelength shifting by appropriately selecting the working temperature and surface treatment of BPLC. This study could be further used as a basis for developing photoswitchable and tunable BPLC photonic devices, such as light-controllable gratings, filters, mirrors, and lasers.

scholarly journals Effect of Surface Alignment on the Stability and Electro-Optical Properties of Blue Phase Liquid Crystals

2014 ◽  
Vol 68 (10) ◽  
pp. J432-J436
Author(s):  
Itaru Yamana ◽  
Thet Naing Oo ◽  
Hirotsugu Kikuchi ◽  
Munehiro Kimura ◽  
Tadashi Akahane
Keyword(s):  
Optical Properties ◽  
Liquid Crystals ◽  
Surface Alignment ◽  
Phase Liquid ◽  
Blue Phase ◽  
The Stability ◽  
Effect Of Surface

Wide-angle lasing from photonic crystal nanostructures of a liquid-crystalline blue phase

2019 ◽  
Vol 7 (21) ◽  
pp. 6433-6439 ◽  
Author(s):  
Guan-Yu Zhuo ◽  
Shu-Wei Huang ◽  
Shih-Hung Lin
Keyword(s):  
Liquid Crystals ◽  
Photonic Crystal ◽  
Photonic Crystals ◽  
Visible Light ◽  
Liquid Crystalline ◽  
Wide Angle ◽  
Phase Liquid ◽  
Blue Phase

Wide-angle lasing emitting dye-doped blue-phase liquid crystals (DDBPLCs), which are analogous to photonic crystals, have been demonstrated to selectively reflect visible light.

scholarly journals Diffusionless transformation of soft cubic superstructure from amorphous to simple cubic and body-centered cubic phases

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Jie Liu ◽  
Wenzhe Liu ◽  
Bo Guan ◽  
Bo Wang ◽  
Lei Shi ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
X Ray Diffraction ◽  
Photonic Materials ◽  
Simple Cubic ◽  
Cubic Phases ◽  
Transmission Electron ◽  
Phase Liquid ◽  
Blue Phase ◽  
Blue Phases ◽  
Temperature Window

AbstractIn a narrow temperature window in going from the isotropic to highly chiral orders, cholesteric liquid crystals exhibit so-called blue phases, consisting of different morphologies of long, space-filling double twisted cylinders. Those of cubic spatial symmetry have attracted considerable attention in recent years as templates for soft photonic materials. The latter often requires the creation of monodomains of predefined orientation and size, but their engineering is complicated by a lack of comprehensive understanding of how blue phases nucleate and transform into each other at a submicrometer length scale. In this work, we accomplish this by intercepting nucleation processes at intermediate stages with fast cross-linking of a stabilizing polymer matrix. We reveal using transmission electron microscopy, synchrotron small-angle X-ray diffraction, and angle-resolved microspectroscopy that the grid of double-twisted cylinders undergoes highly coordinated, diffusionless transformations. In light of our findings, the implementation of several applications is discussed, such as temperature-switchable QR codes, micro-area lasing, and fabrication of blue phase liquid crystals with large domain sizes.

scholarly journals Optofluidic Platform Based on Liquid Crystals in X-Cut Lithium Niobate: Thresholdless All-Optical Response

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 908
Author(s):  
Fabrizio Ciciulla ◽  
Annamaria Zaltron ◽  
Riccardo Zamboni ◽  
Cinzia Sada ◽  
Francesco Simoni ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Light Intensity ◽  
Lithium Niobate ◽  
Photovoltaic Effect ◽  
Optical Control ◽  
Crystal Layer ◽  
Liquid Crystal Layer ◽  
Threshold Behaviour ◽  
All Optical

In this study, we present a new configuration of the recently reported optofluidic platform exploiting liquid crystals reorientation in lithium niobate channels. In order to avoid the threshold behaviour observed in the optical control of the device, we propose microchannels realized in a x-cut crystal closed by a z-cut crystal on the top. In this way, the light-induced photovoltaic field is not uniform inside the liquid crystal layer and therefore the conditions for a thresholdless reorientation are realized. We performed simulations of the photovoltaic effect based on the well assessed model for Lithium Niobate, showing that not uniform orientation and value of the field should be expected inside the microchannel. In agreement with the re-orientational properties of nematic liquid crystals, experimental data confirm the expected thresholdless behaviour. The observed liquid crystal response exhibits two different regimes and the response time shows an unusual dependence on light intensity, both features indicating the presence of additional photo-induced fields appearing above a light intensity of 107 W/m2.

Mesophase properties of fluorene-core mesogens and their effects on blue phase liquid crystals

2021 ◽  
pp. 1-11
Author(s):  
Ying Shi ◽  
WanLi He ◽  
YaQian Zhang ◽  
YongFeng Cui ◽  
Lei Zhang ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Phase Liquid ◽  
Blue Phase

Field-induced lattice transformation of blue-phase liquid crystals

2021 ◽  
Author(s):  
Iam-Choon Khoo ◽  
Chun-Wei Chen ◽  
Tsung-Hsien Lin
Keyword(s):  
Liquid Crystals ◽  
Phase Liquid ◽  
Blue Phase

Ultra-fast switching blue phase liquid crystals diffraction grating stabilized by chiral monomer

2018 ◽  
Vol 51 (18) ◽  
pp. 185103 ◽  
Author(s):  
Ramesh Manda ◽  
Srinivas Pagidi ◽  
Surjya Sarathi Bhattacharya ◽  
Hyesun Yoo ◽  
Arun Kumar T ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Diffraction Grating ◽  
Fast Switching ◽  
Phase Liquid ◽  
Blue Phase

Blue Phase Liquid Crystals and Its Application in Microlens

2012 ◽  
Vol 27 (6) ◽  
pp. 752-758
Author(s):  
李青 LI Qing ◽  
严静 YAN Jing ◽  
崔勇扬 CUI Yong-yang
Keyword(s):  
Liquid Crystals ◽  
Phase Liquid ◽  
Blue Phase

Symmetric Continuously Tunable Photonic Band Gaps in Blue-Phase Liquid Crystals Switched by an Alternating Current Field

2019 ◽  
Vol 11 (24) ◽  
pp. 22015-22020 ◽  
Author(s):  
Xiao-Wei Du ◽  
De-Shan Hou ◽  
Xuan Li ◽  
Dong-Peng Sun ◽  
Jiong-Fang Lan ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
Alternating Current ◽  
Band Gaps ◽  
Photonic Band Gaps ◽  
Current Field ◽  
Phase Liquid ◽  
Blue Phase ◽  
Photonic Band
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