Electrothermal Switching Characteristics from a Hydrogen-Bonded Polymer Network Structure in Cholesteric Liquid Crystals with a Double-Handed Circularly Polarized Light Reflection Band

2011 ◽  
Vol 115 (5) ◽  
pp. 861-868 ◽  
Author(s):  
Jinbao Guo ◽  
Fengjin Chen ◽  
Zhijian Qu ◽  
Huai Yang ◽  
Jie Wei
Keyword(s):  
Liquid Crystals ◽  
Network Structure ◽  
Polymer Network ◽  
Polarized Light ◽  
Light Reflection ◽  
Cholesteric Liquid Crystals ◽  
Reflection Band ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Switching Characteristics

How to broaden the light reflection band in cholesteric liquid crystals? A new approach based on polymorphism

2001 ◽  
Vol 28 (5) ◽  
pp. 803-807 ◽  
Author(s):  
Alexandrine Lavernhe ◽  
Michel Mitov ◽  
Corinne Binet ◽  
Christian Bourgerette
Keyword(s):  
Liquid Crystals ◽  
Light Reflection ◽  
Cholesteric Liquid Crystals ◽  
Reflection Band ◽  
New Approach

scholarly journals Light shutter using dye-doped cholesteric liquid crystals with polymer network structure

2016 ◽  
Vol 18 (1) ◽  
pp. 13-17 ◽  
Author(s):  
Byeong-Hun Yu ◽  
Seong-Min Ji ◽  
Jin-Hun Kim ◽  
Jae-Won Huh ◽  
Tae-Hoon Yoon
Keyword(s):  
Liquid Crystals ◽  
Network Structure ◽  
Polymer Network ◽  
Cholesteric Liquid Crystals

NONLINEAR TRANSMISSION OF PHOTOSENSITIVE CHOLESTERIC LIQUID CRYSTALS DUE TO SPECTRAL BANDWIDTH AUTO-TUNING OR RESTORATION

2007 ◽  
Vol 16 (04) ◽  
pp. 471-483 ◽  
Author(s):  
SVETLANA V. SERAK ◽  
NELSON V. TABIRYAN ◽  
TIMOTHY J. BUNNING
Keyword(s):  
Liquid Crystals ◽  
Dynamic Range ◽  
Optical Feedback ◽  
Bragg Reflection ◽  
Polarized Light ◽  
Green Laser ◽  
Cholesteric Liquid Crystals ◽  
Circularly Polarized Light ◽  
Nonlinear Transmission ◽  
Auto Tuning

Cholesteric liquid crystals (CLCs) which possess a periodicity in the visible portion of the spectra, exhibit selective reflection of circularly polarized light. The ability to modulate this color through a variety of means has been explored, including work which incorporated azobenzene LCs. Two types of systems have recently been explored utilizing wavelength-specific cis-trans isomerization processes, which enable unprecedented photosensitivity. The first system exhibits large blue or red-shifted changes in reflection wavelength upon visible irradiation. The second system exploits the metastable, long-lived photoinduced isotropic state, whose return to the reflective Grandjean texture can be induced by wavelength-specific radiation. We demonstrate nonlinear transmission from both types of systems, starting with submicrowatt power levels and spanning over four orders of magnitude dynamic range. The power dependence and temporal evolution of this effect (10–100 ms) is documented here for red or green laser wavelengths. The effect for the former case is due to bandgap auto-tuning, when the laser beam is tuning the CLC Bragg reflection band to its own wavelength. For the latter case, autonomous, optical feedback due to bandgap restoration is the cause of the nonlinear transmission properties.

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