scholarly journals Polarization independent two-way variable optical attenuator based on polymer-stabilized cholesteric liquid crystal

2010 ◽  
Vol 18 (10) ◽  
pp. 10289 ◽  
Author(s):  
Yuhua Huang
Keyword(s):  
Liquid Crystal ◽  
Cholesteric Liquid Crystal ◽  
Variable Optical Attenuator ◽  
Polymer Stabilized ◽  
Polarization Independent

scholarly journals Fast Switchable Dual-Model Grating by Using Polymer-Stabilized Sphere Phase Liquid Crystal

Polymers ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 884 ◽  
Author(s):  
Xuan Li ◽  
Xiaowei Du ◽  
Peiyun Guo ◽  
Jiliang Zhu ◽  
Wenjiang Ye ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Response Time ◽  
Potential Application ◽  
Diffractive Optics ◽  
Dual Model ◽  
Phase Liquid ◽  
Blue Phase ◽  
Polymer Stabilized ◽  
Polarization Independent ◽  
Great Potential Application

We demonstrated a fast switchable dual-model grating based on a polymer-stabilized sphere phase liquid crystal. To form binary periodicity layers, the polymer-stabilized sphere phase liquid crystal precursor was sequence ultraviolet cured at an isotropic and sphere phase. This grating jointly modulated both the phase and the amplitude, had six times the diffraction efficiency of that fabricated with polymer-stabilized blue phase liquid crystal. Moreover, the dual-model tunable grating shown polarization-independent and submillisecond response time, which may hold a great potential application in diffractive optics.

scholarly journals Polymer Stabilized Cholesteric Liquid Crystal Siloxane for Temperature-Responsive Photonic Coatings

2020 ◽  
Vol 21 (5) ◽  
pp. 1803 ◽  
Author(s):  
Weixin Zhang ◽  
Johan Lub ◽  
Albertus P.H.J. Schenning ◽  
Guofu Zhou ◽  
Laurens T. de Haan
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystalline ◽  
Cholesteric Liquid Crystal ◽  
Uv Curing ◽  
Blue Shift ◽  
Polymer Coatings ◽  
Chain Extension ◽  
Reflective Coating ◽  
Temperature Responsive ◽  
Polymer Stabilized

Temperature-responsive photonic coatings are appealing for a variety of applications, including smart windows. However, the fabrication of such reflective polymer coatings remains a challenge. In this work, we report the development of a temperature-responsive, infrared-reflective coating consisting of a polymer-stabilized cholesteric liquid crystal siloxane, applied by a simple bar coating method. First, a side-chain liquid crystal oligosiloxane containing acrylate, chiral and mesogenic moieties was successfully synthesized via multiple steps, including preparing precursors, hydrosilylation, deprotection, and esterification reactions. Products of all the steps were fully characterized revealing a chain extension during the deprotection step. Subsequently, the photonic coating was fabricated by bar-coating the cholesteric liquid crystal oligomer on glass, using a mediator liquid crystalline molecule. After the UV-curing and removal of the mediator, a transparent IR reflective polymer-stabilized cholesteric liquid crystal coating was obtained. Notably, this fully cured, partially crosslinked transparent polymer coating retained temperature responsiveness due to the presence of non-reactive liquid-crystal oligosiloxanes. Upon increasing the temperature from room temperature, the polymer-stabilized cholesteric liquid crystal coating showed a continuous blue-shift of the reflection band from 1400 nm to 800 nm, and the shift was fully reversible.

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