Small twist angle measurement in homogeneously aligned liquid crystal cells

2009 ◽  
Vol 94 (9) ◽  
pp. 093507 ◽  
Author(s):  
Chang-Hun Lee ◽  
S. J. Elston ◽  
E. P. Raynes
Keyword(s):  
Liquid Crystal ◽  
Twist Angle ◽  
Angle Measurement ◽  
Crystal Cells

Analytic twist angle measurement in liquid crystal cells

2009 ◽  
Vol 95 (8) ◽  
pp. 083505
Author(s):  
Chang-Hun Lee ◽  
P. Salter ◽  
E. P. Raynes ◽  
S. J. Elston
Keyword(s):  
Liquid Crystal ◽  
Twist Angle ◽  
Angle Measurement ◽  
Crystal Cells

scholarly journals Passively Tunable Terahertz Filters Using Liquid Crystal Cells Coated with Metamaterials

Coatings ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 381
Author(s):  
Wei-Fan Chiang ◽  
Yu-Yun Lu ◽  
Yin-Pei Chen ◽  
Xin-Yu Lin ◽  
Tsong-Shin Lim ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Ring Resonators ◽  
Maximum Frequency ◽  
Split Ring ◽  
Split Ring Resonators ◽  
Terahertz Region ◽  
Resonance Frequencies ◽  
Terahertz Communication ◽  
Terahertz Sensing ◽  
Crystal Cells

Liquid crystal (LC) cells that are coated with metamaterials are fabricated in this work. The LC directors in the cells are aligned by rubbed polyimide layers, and make angles θ of 0°, 45°, and 90° with respect to the gaps of the split-ring resonators (SRRs) of the metamaterials. Experimental results display that the resonance frequencies of the metamaterials in these cells increase with an increase in θ, and the cells have a maximum frequency shifting region of 18 GHz. Simulated results reveal that the increase in the resonance frequencies arises from the birefringence of the LC, and the LC has a birefringence of 0.15 in the terahertz region. The resonance frequencies of the metamaterials are shifted by the rubbing directions of the polyimide layers, so the LC cells coated with the metamaterials are passively tunable terahertz filters. The passively tunable terahertz filters exhibit promising applications on terahertz communication, terahertz sensing, and terahertz imaging.

Model of Ion Solvation in Liquid Crystal Cells

1998 ◽  
Vol 37 (Part 2, No. 1A/B) ◽  
pp. L88-L90 ◽  
Author(s):  
Matthias Bremer ◽  
Shohei Naemura ◽  
Kazuaki Tarumi
Keyword(s):  
Liquid Crystal ◽  
Ion Solvation ◽  
Crystal Cells
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