Fast liquid crystal end-less polarisation controller for first order PMD compensation

2003 ◽  
Vol 58 (9-10) ◽  
pp. 1364-1377
Author(s):  
Laurent Dupont ◽  
Jean -Louis de Bougrenet de la Tocnaye ◽  
Michel Gadonna ◽  
Thierry Sansoni
Keyword(s):  
Liquid Crystal ◽  
First Order ◽  
Pmd Compensation

scholarly journals First-order liquid crystal orientation transition on inhomogeneous substrates

2004 ◽  
Vol 69 (2) ◽  
Author(s):  
Ophelia K. C. Tsui ◽  
Fuk Kay Lee ◽  
Baoshe Zhang ◽  
Ping Sheng
Keyword(s):  
Liquid Crystal ◽  
Crystal Orientation ◽  
First Order ◽  
Liquid Crystal Orientation

scholarly journals Diffraction and Polarization Properties of Electrically–Tunable Nematic Liquid Crystal Grating

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1929 ◽  
Author(s):  
Shuan-Yu Huang ◽  
Bing-Yau Huang ◽  
Chi-Chung Kang ◽  
Chie-Tong Kuo
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Electric Fields ◽  
Applied Voltage ◽  
Incident Beam ◽  
Electrode Structure ◽  
First Order ◽  
External Electric Fields ◽  
Order Diffraction ◽  
Liquid Crystal Grating

This work demonstrates an electrically-tunable nematic liquid crystal (NLC) diffraction grating with a periodic electrode structure, and discusses the polarization properties of its diffraction. The efficiency of the first-order diffraction can be gradually controlled by applying external electric fields cross the NLC, and the maximum diffraction efficiency of the first-order diffraction that can be obtained is around 12.5% under the applied voltage of 5.0 V. In addition to the applied electric field, the efficiency of the first-order diffraction can also vary by changing the polarized state of the incident beam. Antisymmetric polarization states with symmetrical intensities in the diffractions corresponding to the +1 and −1 order diffraction signals are also demonstrated.

scholarly journals Miscibility studies of two twist-bend nematic liquid crystal dimers with different average molecular curvatures. A comparison between experimental data and predictions of a Landau mean-field theory for the NTB–N phase transition

2016 ◽  
Vol 18 (6) ◽  
pp. 4394-4404 ◽  
Author(s):  
D. O. López ◽  
B. Robles-Hernández ◽  
J. Salud ◽  
M. R. de la Fuente ◽  
N. Sebastián ◽  
...  
Keyword(s):  
Field Theory ◽  
Experimental Data ◽  
Phase Transition ◽  
Liquid Crystal ◽  
Nematic Phase ◽  
Mean Field Theory ◽  
Mean Field ◽  
Landau Model ◽  
First Order ◽  
Miscibility Studies

We have developed a Landau model that predicts a first order twist-bend nematic–nematic phase transition.

Light-induced first-order orientational transitions in a nematic liquid crystal in the presence of an ordinary wave

2012 ◽  
Vol 42 (4) ◽  
pp. 327-331 ◽  
Author(s):  
A S Zolot'ko ◽  
Mikhail P Smaev ◽  
S A Shvetsov ◽  
N I Boiko ◽  
M I Barnik
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Ordinary Wave ◽  
First Order ◽  
Orientational Transitions

Step Response Characteristics of Anisotropic Gel Actuator Hybridized with Nanosheet Liquid Crystal

2019 ◽  
Vol 31 (5) ◽  
pp. 647-656 ◽  
Author(s):  
Hitoshi Kino ◽  
◽  
Akihiro Kiyota ◽  
Takumi Inadomi ◽  
Tomonori Kato ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Steady State ◽  
Time Constant ◽  
Step Response ◽  
Response Property ◽  
First Order ◽  
Response Characteristics ◽  
Thermal Change ◽  
Heating And Cooling ◽  
Original Size

In this study, we focus on a soft anisotropic gel actuator hybridized with nanosheet liquid crystal. This gel actuator is highly hydrophilic and can be operated underwater. Gel actuators can contract when heated and expand back to their original size when cooled down. It is anisotropic in the contraction direction, aligned with the orientation of the nanosheet liquid crystal. However, details of this step response property against the actuator undergoing thermal change have not been clarified. In this paper, we introduce a method to measure the step response using a square test sheet with a side length of 2–10 mm and thickness of 0.1–1.0 mm. This measurement was used to measure the heating and cooling step response. The obtained result was approximated using a first-order lag system to determine a steady-state value and time constant. In addition, the characteristics of steady-state value and time constant were clarified from the viewpoint of shapes such as specific surface area and thickness.

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