scholarly journals Dynamical studies of the mechanisms for optical nonlinearities of methyl-red dye doped blue phase liquid crystals

2015 ◽  
Vol 23 (17) ◽  
pp. 21650 ◽  
Author(s):  
Chun-Wei Chen ◽  
Tsung-Hsien Lin ◽  
Iam Choon Khoo
Keyword(s):  
Liquid Crystals ◽  
Optical Nonlinearities ◽  
Methyl Red ◽  
Phase Liquid ◽  
Blue Phase ◽  
Red Dye

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.

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

Optically induced birefringence in dye-doped blue phase liquid crystals

2019 ◽  
Vol 46 (6) ◽  
pp. 913-919
Author(s):  
Lin ◽  
Kuo ◽  
Huang ◽  
Wu ◽  
Lin ◽  
...  
Keyword(s):  
Refractive Index ◽  
Liquid Crystal ◽  
Pump Beam ◽  
Pump Intensity ◽  
Photoinduced Change ◽  
Methyl Red ◽  
Sem Images ◽  
Photoinduced Birefringence ◽  
Phase Liquid ◽  
Blue Phase

This paper investigates the photoinduced change of refractive index in dye (methyl red, MR)-doped blue phase (DDBP) cells by illumination of a pump beam. Through excitation of light irradiation with proper photon energy, MR can transform from trans-state to cis-state and successively diffuse and anisotropically adsorb on the inner glass substrate of the DDBP cell along the direction perpendicular to the polarisation of the pump beam. The adsorbed MR molecules can effectively rotate the orientation of the liquid crystal (LC) molecules and thereby modulate the effective refractive index of the DDBP cell. The SEM images of the adsorbed regions of the illuminated DDBP samples were also taken for discussing the relation between the pump intensity and the photoinduced birefringence.

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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