Determination of the unified surface-anchoring energy of a nematic liquid crystal on a polymer substrate

1998 ◽  
Vol 72 (3) ◽  
pp. 329-331 ◽  
Author(s):  
Akihiko Sugimura ◽  
Tetsuo Miyamoto ◽  
Makoto Tsuji ◽  
Michiyoshi Kuze
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Polymer Substrate ◽  
Surface Anchoring ◽  
Anchoring Energy

Fully leaky guided wave determination of the polar anchoring energy of a homogeneously aligned nematic liquid crystal

2000 ◽  
Vol 87 (6) ◽  
pp. 2726-2735 ◽  
Author(s):  
Fuzi Yang ◽  
J. R. Sambles ◽  
Youmei Dong ◽  
Hongjin Gao
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Guided Wave ◽  
Anchoring Energy

Optical determination of large distortion surface anchoring torques in a nematic liquid crystal

1984 ◽  
Vol 103 (8) ◽  
pp. 385-388 ◽  
Author(s):  
G. Barbero ◽  
N.V. Madhusudana ◽  
J.F. Palierne ◽  
G. Durand
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Surface Anchoring ◽  
Large Distortion ◽  
Optical Determination

scholarly journals Electrically Tuneable Optical Diffraction Gratings Based on a Polymer Scaffold Filled with a Nematic Liquid Crystal

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2292
Author(s):  
Dejan Bošnjaković ◽  
Mathias Fleisch ◽  
Xinzheng Zhang ◽  
Irena Drevenšek-Olenik
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Optical Diffraction ◽  
Polymer Scaffold ◽  
Inhomogeneous Surface ◽  
Optical Elements ◽  
Surface Anchoring ◽  
Rigorous Coupled Wave Analysis ◽  
Anchoring Energy ◽  
Rigorous Coupled Wave

We present an experimental and theoretical investigation of the optical diffractive properties of electrically tuneable optical transmission gratings assembled as stacks of periodic slices from a conventional nematic liquid crystal (E7) and a standard photoresist polymer (SU-8). The external electric field causes a twist-type reorientation of the LC molecules toward a perpendicular direction with respect to initial orientation. The associated field-induced modification of the director field is determined numerically and analytically by minimization of the Landau–de Gennes free energy. The optical diffraction properties of the associated periodically modulated structure are calculated numerically on the basis of rigorous coupled-wave analysis (RCWA). A comparison of experimental and theoretical results suggests that polymer slices provoke planar surface anchoring of the LC molecules with the inhomogeneous surface anchoring energy varying in the range 5–20 μJ/m2. The investigated structures provide a versatile approach to fabricating LC-polymer-based electrically tuneable diffractive optical elements (DOEs).

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