cholesteric liquid crystals
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Author(s):  
K. R. Dossumbekov ◽  
N. A. Ispulov ◽  
A. A. Kurmanov ◽  
A. Zh. Zhumabekov

Optik ◽  
2021 ◽  
Vol 247 ◽  
pp. 167927
Author(s):  
A.H. Gevorgyan ◽  
S.S. Golik ◽  
Y.N. Kulchin ◽  
N.A. Vanyushkin

Optik ◽  
2021 ◽  
Vol 248 ◽  
pp. 168110
Author(s):  
Emine Kemiklioglu ◽  
Berfin Gurboga ◽  
Ebru Busra Tuncgovde

2021 ◽  
Author(s):  
Kuan-Wu Lin ◽  
Heng-Yi Tseng ◽  
Li-Min Chang ◽  
Cheng-Chang Li ◽  
Chun Wang ◽  
...  

Polymers ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3720
Author(s):  
Mi-Yun Jeong ◽  
Hyeon-Jong Choi ◽  
Keumcheol Kwak ◽  
Younghun Yu

We report that polymerization makes a robust, practically applicable multifunctional optical device with a continuous wavelength tunable over 500 nm spectral range using UV-polymerizable cholesteric liquid crystals (CLCs). It can be used as a circular polarizer generating an extremely high degree of circularly polarized light with |g| = 1.85~2.00. It can also be used for optical notch filters, bandwidth-variable (from ~28 nm to ~93 nm) bandpass filters, mirrors, and intensity-variable beam splitters. Furthermore, this CLC device shows excellent stability owing to the polymerization of CLC cells. Its performance remains constant for a long time (~2 years) after a high-temperature exposure (170 °C for 1 h) and an extremely high laser beam intensity exposure (~143 W/cm2 of CW 532 nm diode laser and ~2.98 MW/cm2 of Nd: YAG pulse laser operation for two hours, respectively). The optical properties of polymerized CLC were theoretically analyzed by Berreman’s 4 × 4 matrix method. The characteristics of this device were significantly improved by introducing an anti-reflection layer on the device. This wavelength-tunable and multifunctional device could dramatically increase optical research efficiency in various spectroscopic works. It could be applied to many instruments using visible and near-infrared wavelengths.


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