Photo-Thermal Modulation of Cholesteric Liquid Crystals with a Dual Circularly Polarized Light Reflection Band

2015 ◽  
Vol 608 (1) ◽  
pp. 91-102 ◽  
Author(s):  
Ouyu Jin ◽  
Huihui Xing ◽  
Jiewei ◽  
Jinbao Guo
Keyword(s):  
Liquid Crystals ◽  
Polarized Light ◽  
Light Reflection ◽  
Cholesteric Liquid Crystals ◽  
Reflection Band ◽  
Thermal Modulation ◽  
Circularly Polarized Light ◽  
Circularly Polarized

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

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.

Light reflection by the cuticle ofC. aurigansscarabs: a biological broadband reflector of left handed circularly polarized light

2014 ◽  
Vol 16 (8) ◽  
pp. 082001 ◽  
Author(s):  
E Libby ◽  
D E Azofeifa ◽  
M Hernández-Jiménez ◽  
C Barboza-Aguilar ◽  
A Solís ◽  
...  
Keyword(s):  
Polarized Light ◽  
Light Reflection ◽  
Circularly Polarized Light ◽  
Circularly Polarized ◽  
Left Handed
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