scholarly journals All-optical responsive azo-doped liquid crystal laser protection filter

2018 ◽  
Vol 26 (26) ◽  
pp. 34179 ◽  
Author(s):  
Ethan I. L. Jull ◽  
Helen F. Gleeson
Keyword(s):  
Liquid Crystal ◽  
Crystal Laser ◽  
All Optical ◽  
Protection Filter

scholarly journals Optofluidic Platform Based on Liquid Crystals in X-Cut Lithium Niobate: Thresholdless All-Optical Response

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 908
Author(s):  
Fabrizio Ciciulla ◽  
Annamaria Zaltron ◽  
Riccardo Zamboni ◽  
Cinzia Sada ◽  
Francesco Simoni ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Light Intensity ◽  
Lithium Niobate ◽  
Photovoltaic Effect ◽  
Optical Control ◽  
Crystal Layer ◽  
Liquid Crystal Layer ◽  
Threshold Behaviour ◽  
All Optical

In this study, we present a new configuration of the recently reported optofluidic platform exploiting liquid crystals reorientation in lithium niobate channels. In order to avoid the threshold behaviour observed in the optical control of the device, we propose microchannels realized in a x-cut crystal closed by a z-cut crystal on the top. In this way, the light-induced photovoltaic field is not uniform inside the liquid crystal layer and therefore the conditions for a thresholdless reorientation are realized. We performed simulations of the photovoltaic effect based on the well assessed model for Lithium Niobate, showing that not uniform orientation and value of the field should be expected inside the microchannel. In agreement with the re-orientational properties of nematic liquid crystals, experimental data confirm the expected thresholdless behaviour. The observed liquid crystal response exhibits two different regimes and the response time shows an unusual dependence on light intensity, both features indicating the presence of additional photo-induced fields appearing above a light intensity of 107 W/m2.

A robust and inexpensive all optical switch with chiral nematic liquid crystal

2021 ◽  
Vol 119 ◽  
pp. 111306
Author(s):  
Hossein mehrzad ◽  
Ezeddin Mohajerani ◽  
Mohammad Mohammadimasoudi ◽  
Kristiaan Neyts
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Optical Switch ◽  
Chiral Nematic ◽  
All Optical ◽  
All Optical Switch

scholarly journals Threshold improvement in uniformly lying helix cholesteric liquid crystal laser using auxiliary π-conjugated polymer active layer

2013 ◽  
Vol 113 (20) ◽  
pp. 203105 ◽  
Author(s):  
Hiroyuki Yoshida ◽  
Yusuke Shiozaki ◽  
Yo Inoue ◽  
Masaya Takahashi ◽  
Yasuhiro Ogawa ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Active Layer ◽  
Conjugated Polymer ◽  
Cholesteric Liquid Crystal ◽  
Crystal Laser

scholarly journals Liquid-crystal electric tuning of a photonic crystal laser

2004 ◽  
Vol 85 (3) ◽  
pp. 360-362 ◽  
Author(s):  
Brett Maune ◽  
Marko Lončar ◽  
Jeremy Witzens ◽  
Michael Hochberg ◽  
Thomas Baehr-Jones ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Photonic Crystal ◽  
Crystal Laser ◽  
Photonic Crystal Laser

Emission Direction‐Tunable Liquid Crystal Laser

2020 ◽  
Vol 8 (16) ◽  
pp. 2000375 ◽  
Author(s):  
SeongYong Cho ◽  
Hiroyuki Yoshida ◽  
Masanori Ozaki
Keyword(s):  
Liquid Crystal ◽  
Crystal Laser
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