Spatial filter based on azo-dye-doped liquid crystal films

2007 ◽  
Author(s):  
Andy Y.-G. Fuh ◽  
Tsung-Hsien Lin
Keyword(s):  
Liquid Crystal ◽  
Azo Dye ◽  
Spatial Filter ◽  
Liquid Crystal Films ◽  
Crystal Films

Self-phase modulation in azo-dye-doped liquid crystal films

2010 ◽  
Author(s):  
Andy Ying-Guey Fuh ◽  
Chia-Wei Chu ◽  
Hui-Chi Lin ◽  
Hung-Chang Jau ◽  
Ming-Shian Li
Keyword(s):  
Liquid Crystal ◽  
Phase Modulation ◽  
Azo Dye ◽  
Self Phase Modulation ◽  
Liquid Crystal Films ◽  
Crystal Films

Polarization-independent holographic gratings based on azo-dye-doped polymer-dispersed liquid-crystal films

2010 ◽  
Vol 49 (2) ◽  
pp. 275 ◽  
Author(s):  
Andy Ying-Guey Fuh ◽  
Che-Chang Chen ◽  
Ko-Ting Cheng ◽  
Cheng-Kai Liu ◽  
Wei-Ko Chen
Keyword(s):  
Liquid Crystal ◽  
Azo Dye ◽  
Holographic Gratings ◽  
Liquid Crystal Films ◽  
Polymer Dispersed Liquid Crystal ◽  
Crystal Films ◽  
Polymer Dispersed ◽  
Doped Polymer ◽  
Polarization Independent

Photo-Alignment Effect in Liquid-Crystal Films Containing Nanoparticles and Azo-Dye

2010 ◽  
Vol 428-429 ◽  
pp. 276-279 ◽  
Author(s):  
Tsung Hsien Lin ◽  
Wen Zheng Chen
Keyword(s):  
Liquid Crystal ◽  
Azo Dye ◽  
Polyhedral Oligomeric Silsesquioxanes ◽  
Alignment Effect ◽  
Practical Applications ◽  
Liquid Crystal Films ◽  
Crystal Film ◽  
Crystal Films ◽  
Alignment Technique ◽  
Photo Alignment

This work reports the photo-alignment effect in a liquid-crystal film doped with nanoparticles and azo-dye. Vertical alignment induced by the nanoparticles polyhedral oligomeric silsesquioxanes (POSS) can be switched to homogeneous alignment by the absorption of photo-excited azo-dye. Both electro-optical and surface properties are analyzed to verify this effect. Using this photo-alignment technique in nanoparticle- and azo-dye-doped liquid crystal, the phase grating is also demonstrated. The diffraction efficiency is related to the polarization of the probe light and can be controlled by applying voltage. Both nanoparticle- and azo-dye-induced vertical and homogeneous alignments are non-contact aligning methods. Thus, the technique based on dopant-induced alignment has potential for practical applications.

scholarly journals Biphotonic-induced reorientation inversion in azo-dye-doped liquid crystal films

2011 ◽  
Vol 19 (14) ◽  
pp. 13118 ◽  
Author(s):  
Hui-Chi Lin ◽  
Chia-Wei Chu ◽  
Ming-Shian Li ◽  
Andy Ying-Guey Fuh
Keyword(s):  
Liquid Crystal ◽  
Azo Dye ◽  
Liquid Crystal Films ◽  
Crystal Films

Attractive mode force microscopy of chiral liquid crystal surfaces

1992 ◽  
Vol 50 (1) ◽  
pp. 268-269
Author(s):  
B.D. Terris ◽  
R. J. Twieg ◽  
C. Nguyen ◽  
G. Sigaud ◽  
H. T. Nguyen
Keyword(s):  
Liquid Crystal ◽  
Crystal Surfaces ◽  
Free Surfaces ◽  
Control Range ◽  
Force Microscopy ◽  
Liquid Crystal Films ◽  
Chiral Liquid Crystal ◽  
Crystal Films ◽  
Electrostatic Charging ◽  
And Shifts

We have used a force microscope in the attractive, or noncontact, mode to image a variety of surfaces. In this mode, the microscope tip is oscillated near its resonant frequency and shifts in this frequency due to changes in the surface-tip force gradient are detected. We have used this technique in a variety of applications to polymers, including electrostatic charging, phase separation of ionomer surfaces, and crazing of glassy films.Most recently, we have applied the force microscope to imaging the free surfaces of chiral liquid crystal films. The compounds used (Table 1) have been chosen for their polymorphic variety of fluid mesophases, all of which exist within the temperature control range of our force microscope.

Dynamics of tilted hexatic phases in liquid-crystal films

1991 ◽  
Vol 1 (11) ◽  
pp. 1363-1373 ◽  
Author(s):  
Jonathan V. Selinger
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystal Films ◽  
Crystal Films
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