Optically switchable and axially symmetric half-wave plate based on photoaligned liquid crystal films

2016 ◽  
Vol 57 ◽  
pp. 23-27 ◽  
Author(s):  
C.-C. Lin ◽  
T.-C. Huang ◽  
C.-C. Chu ◽  
Vincent K.S. Hsiao
Keyword(s):  
Liquid Crystal ◽  
Axially Symmetric ◽  
Half Wave Plate ◽  
Wave Plate ◽  
Liquid Crystal Films ◽  
Half Wave ◽  
Crystal Films

scholarly journals Optical Filter with Large Angular Dependence of Transmittance Using Liquid Crystal Devices

Crystals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1199
Author(s):  
Kohki Takatoh ◽  
Masahiro Ito ◽  
Suguru Saito ◽  
Yuuta Takagi
Keyword(s):  
Liquid Crystal ◽  
Incident Angle ◽  
Optical Filter ◽  
Half Wave Plate ◽  
S Waves ◽  
Wave Plate ◽  
Liquid Crystal Devices ◽  
Half Wave ◽  
Wide Range ◽  
Pretilt Angles

This study proposed a new type of optical device with variable transmittance based on the incident angle direction. These devices consist of two liquid crystal devices (LCDs) with a half-wave plate between them. Hybrid aligned nematic (HAN)-type guest-host (GH) LCDs or GH-LCDs with antiparallel alignment of high pretilt angles were used. The use of a half-wave plate allowed for the control of the p- and s-waves. Using these devices, a wide range of transmittances were obtained because no polarizer was used. The newly proposed LCDs have a wide range of applications, including use on buildings, vehicles, and glasses.

Refractive index matched half-wave plate with a nematic liquid crystal for three-dimensional laser metrology applications

2016 ◽  
Vol 24 (4) ◽  
Author(s):  
W. Piecek ◽  
L.R. Jaroszewicz ◽  
E. Miszczyk ◽  
Z. Raszewski ◽  
M. Mrukiewicz ◽  
...  
Keyword(s):  
Refractive Index ◽  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Twist Angle ◽  
Three Dimensional ◽  
Light Polarization ◽  
Half Wave Plate ◽  
Wave Plate ◽  
Half Wave ◽  
Laser Metrology

AbstractThere exists a need in a quality and accuracy of a three-dimensional laser metrology operating in numerically controlled automatic machines. For this purpose, one sends three laser beams mutually perpendicular. These three beams of the wavelength λ = 0.6328 μm are generated by the same laser and are directed along three independent, orthogonal, mutually perpendicular, optical paths with a given light polarization plain. Using these beams, constituting the frame of coordinates, three independent laser rangefinders are able to determine spatial coordinates of a working tool or a workpiece. To form these optical pulses, a special refractive index matched Half-Wave Plate with nematic Liquid Crystal (LCHWP) was applied. The presented half-wave plate is based on a single Twisted Nematic (TN) cell (with the twist angle

scholarly journals Axially symmetric polarization converters based on photo-aligned liquid crystal films

2008 ◽  
Vol 16 (6) ◽  
pp. 3768 ◽  
Author(s):  
Ying-Yu Tzeng ◽  
Shih-Wei Ke ◽  
Chi-Lun Ting ◽  
Andy Y.-G. Fuh ◽  
Tsung-Hsien Lin
Keyword(s):  
Liquid Crystal ◽  
Axially Symmetric ◽  
Liquid Crystal Films ◽  
Crystal Films ◽  
Polarization Converters

scholarly journals Chiral-Selective Tamm Plasmon Polaritons

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2788
Author(s):  
Meng-Ying Lin ◽  
Wen-Hui Xu ◽  
Rashid G. Bikbaev ◽  
Jhen-Hong Yang ◽  
Chang-Ruei Li ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
Cholesteric Liquid Crystal ◽  
Bragg Reflectors ◽  
Distributed Bragg Reflectors ◽  
Half Wave Plate ◽  
Wave Plate ◽  
Half Wave ◽  
Plasmon Polariton ◽  
Plasmon Polaritons

Chiral-selective Tamm plasmon polariton (TPP) has been investigated at the interface between a cholesteric liquid crystal and a metasurface. Different from conventional TPP that occurs with distributed Bragg reflectors and metals, the chiral–achiral TPP is successfully demonstrated. The design of the metasurface as a reflective half-wave plate provides phase and polarization matching. Accordingly, a strong localized electric field and sharp resonance are observed and proven to be widely tunable.

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

scholarly journals Annihilation of point defect pairs in freely suspended liquid-crystal films

2020 ◽  
Vol 2 (1) ◽  
Author(s):  
Amine Missaoui ◽  
Kirsten Harth ◽  
Peter Salamon ◽  
Ralf Stannarius
Keyword(s):  
Liquid Crystal ◽  
Point Defect ◽  
Liquid Crystal Films ◽  
Crystal Films ◽  
Freely Suspended
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