Behavior of the Cholesteric Liquid-Crystal Fabry-Perot Cavity in the Bragg Reflection Band

2000 ◽  
Vol 84 (6) ◽  
pp. 1168-1171 ◽  
Author(s):  
Zhizhong Zhuang ◽  
Young Jin Kim ◽  
J. S. Patel
Keyword(s):  
Liquid Crystal ◽  
Bragg Reflection ◽  
Cholesteric Liquid Crystal ◽  
Reflection Band ◽  
Fabry Perot

Fabry–Perot etalon with polymer cholesteric liquid-crystal mirrors

1999 ◽  
Vol 24 (1) ◽  
pp. 55 ◽  
Author(s):  
Jay E. Stockley ◽  
Gary D. Sharp ◽  
Kristina M. Johnson
Keyword(s):  
Liquid Crystal ◽  
Cholesteric Liquid Crystal ◽  
Fabry Perot

Thermal and electrical wavelength tuning of Bragg reflection with ultraviolet light absorbers in polymer-stabilized cholesteric liquid crystals

2018 ◽  
Vol 6 (45) ◽  
pp. 12377-12385 ◽  
Author(s):  
Amid Ranjkesh ◽  
Tae-Hoon Yoon
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Electric Field ◽  
Ultraviolet Light ◽  
Bragg Reflection ◽  
Cholesteric Liquid Crystal ◽  
Wavelength Tuning ◽  
Cholesteric Liquid Crystals ◽  
Light Absorbers ◽  
Polymer Stabilized

A dual thermal and electrical polymer-stabilized cholesteric liquid crystal has been fabricated by using ultraviolet light absorbers. The Bragg reflection can be autonomously controlled by temperature and manually by an electric field.

scholarly journals Characterization of Second-Order Reflection Bands from a Cholesteric Liquid Crystal Cell Based on a Wavelength-Swept Laser

Sensors ◽  
2020 ◽  
Vol 20 (16) ◽  
pp. 4643
Author(s):  
Soyeon Ahn ◽  
Myeong Ock Ko ◽  
Jong-Hyun Kim ◽  
Zhongping Chen ◽  
Min Yong Jeon
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
Incident Angle ◽  
Cholesteric Liquid Crystal ◽  
Second Order ◽  
Wavelength Shift ◽  
Angle Of Incidence ◽  
Reflection Band ◽  
Order Reflection

We report the results of an experimental study of the characterization of second-order reflection bands from a cholesteric liquid crystal (CLC) cell that depends on the applied electric field, using a wide bandwidth wavelength-swept laser. The second-order reflection bands around 1300 nm and 1500 nm were observed using an optical spectrum analyzer when an electric field was applied to a horizontally oriented electrode cell with a pitch of 1.77 μm. A second-order reflection spectrum began to appear when the intensity of the electric field was 1.03 Vrms/μm with the angle of incidence to the CLC cell fixed at 36°. The reflectance increased as the intensity of the electric field increased at an angle of incidence of 20°, whereas at an incident angle of 36°, when an electric field of a predetermined value or more was applied to the CLC cell, it was confirmed that deformation was completely formed in the liquid crystal and the reflectance was saturated to a constant level. As the intensity of the electric field increased further, the reflection band shifted to a longer wavelength and discontinuous wavelength shift due to the pitch jump was observed rather than a continuous wavelength increase. In addition, the reflection band changed when the angle of incidence on the CLC cell was changed. As the angle of incidence gradually increased, the center wavelength of the reflection band moved towards shorter wavelengths. In the future, we intend to develop a device for optical wavelength filters based on side-polished optical fibers. This is expected to have a potential application as a wavelength notch filter or a bandpass filter.

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