scholarly journals Ultrafast electrical switching of nanostructured metadevice with dual-frequency liquid crystal

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Rafał Kowerdziej ◽  
Jerzy Wróbel ◽  
Przemysław Kula
Keyword(s):  
Liquid Crystal ◽  
Soft Matter ◽  
Fast Response ◽  
Electrical Signal ◽  
Dielectric Anisotropy ◽  
Dual Frequency ◽  
Active Devices ◽  
Total Response Time ◽  
Development Direction ◽  
Hybrid Metamaterial

AbstractShortening of switching times of various soft-matter-based tunable metamaterials is one of the key challenges to improve the functionality of modern active devices. Here we show an effective strategy in the evolution of soft-matter-based tunable metamaterials that makes possible acceleration of both on and off switching processes by using a dual-frequency liquid crystal mixture. The frequency-convertible dielectric anisotropy of the dual-frequency mixture enabled us to create a fast-response in-plane switching metasurface at the nanoscale, which could be tuned by an electrical signal with different frequencies. The results clearly show that the resonance of the metamaterial can be continuously and reversibly controlled within a wavelength range of 100 nm as the applied frequency is inverted between 1 kHz and 40 kHz, with a total response time (τ = τON + τOFF) of 1.89 ms. Furthermore, experimental characteristics of the hybrid metamaterial are in great agreement with numerical calculations, which allow us to anticipate active epsilon-near-zero behavior of the metadevice. This work indicates the future development direction of liquid-crystal-based active plasmonic systems.

scholarly journals Fast-response and high-efficiency optical switch based on dual-frequency liquid crystal polarization grating

2016 ◽  
Vol 6 (2) ◽  
pp. 597 ◽  
Author(s):  
Wei Duan ◽  
Peng Chen ◽  
Bing-Yan Wei ◽  
Shi-Jun Ge ◽  
Xiao Liang ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
High Efficiency ◽  
Optical Switch ◽  
Fast Response ◽  
Dual Frequency ◽  
Polarization Grating

Preparation and Optical Properties of a Reverse-Mode Polymer Dispersed Liquid Crystal Film

1992 ◽  
Vol 277 ◽  
Author(s):  
Tomohisa Gotoh ◽  
Hideya Murai ◽  
Etsuo Hasegawa ◽  
Katsuhiro Mizoguchi
Keyword(s):  
Liquid Crystal ◽  
Porous Polymer ◽  
Dielectric Anisotropy ◽  
Distinct Advantage ◽  
Dual Frequency ◽  
Uv Curable ◽  
Polymer Dispersed Liquid Crystal ◽  
Reverse Mode ◽  
Polymer Dispersed ◽  
Substitution Type

ABSTRACTTwo new types of reverse-mode polymer-dispersed liquid crystal films have been developed and successfully produced. The first was produced by UV-curing of a mixture of dual frequency addressable liquid crystal (DFALC) and UV-curable polymers under an applied voltage at a frequency lower than the crossover frequency (fc) of the DFALC. This first type is referred to as a dual frequency type. The second type was produced by injecting a liquid crystal having negative dielectric anisotropy into a specially prepared porous polymer film from which liquid crystal having positive dielectric anisotropy had previously been extracted. The type thus produced through such “negative-for-positive” substitution is referred to as a substitution type. While the dual frequency type can not be driven at a low frequency, substitution type can, which gives it a distinct advantage. Other electro-optic characteristics of the two types of films, including alignment properties of the liquid crystal molecules, are also discussed.

Continuously tunable and fast-response terahertz metamaterials using in-plane-switching dual-frequency liquid crystal cells

2015 ◽  
Vol 40 (9) ◽  
pp. 2021 ◽  
Author(s):  
Chia-Chun Chen ◽  
Wei-Fan Chiang ◽  
Min-Cheng Tsai ◽  
Shun-An Jiang ◽  
Tsung-Hao Chang ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Fast Response ◽  
Dual Frequency ◽  
Crystal Cells ◽  
Terahertz Metamaterials

scholarly journals Electro-Optical and Photo Stabilization Study of Nematic Ternary Mixture

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2283
Author(s):  
Aleksandra Kalbarczyk ◽  
Noureddine Bennis ◽  
Jakub Herman ◽  
Leszek R. Jaroszewicz ◽  
Przemysław Kula
Keyword(s):  
Liquid Crystal ◽  
Ternary Mixture ◽  
Liquid Crystal Displays ◽  
Dielectric Anisotropy ◽  
Driving Voltage ◽  
Dual Frequency ◽  
High Frequencies ◽  
High Birefringence ◽  
High Dielectric ◽  
Mesomorphic Properties

Liquid crystal materials composed of mixed nematic compounds find broad use in liquid crystal displays and photonic applications. A ternary mixture formed from three different nematic compounds shows peculiar behavior such as tunable electro-optical properties dependent on the frequency of the driving voltage. The paper presents an analysis of the response time and phase retardation of a frequency tunable nematic liquid crystal mixture (under code name 5005). This material possesses high birefringence (Δn = 0.32 at 633 nm) as well as high dielectric anisotropy (Δε = 6.3 at 100 Hz). The unique property of the 5005 mixture is frequency-controlled phase modulation, as in a dual frequency liquid crystal, while dielectric anisotropy goes to zero instead of being negative at high frequencies. For each component of the mixture, details on mesomorphic properties and their role in the formulation of the mixture are reported. The 5005 mixture was characterized by multiple investigation techniques, such as temperature dependence dielectric anisotropy, transmittance measurements image polarizing microscopy, and UV stability.

Dual-frequency liquid crystal-polymer grating for fast response optical beam steering

2019 ◽  
Vol 28 (10) ◽  
pp. 105036 ◽  
Author(s):  
Xiaobing Shang ◽  
Dieter Cuypers ◽  
Fang Chen ◽  
Chaowei Xu ◽  
Quan Li ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Beam Steering ◽  
Fast Response ◽  
Liquid Crystal Polymer ◽  
Optical Beam ◽  
Dual Frequency ◽  
Crystal Polymer ◽  
Polymer Grating

Fast response dual-frequency liquid crystal switch with photo-patterned alignments

2012 ◽  
Vol 37 (17) ◽  
pp. 3627 ◽  
Author(s):  
Xiao-Wen Lin ◽  
Wei Hu ◽  
Xi-Kui Hu ◽  
Xiao Liang ◽  
Ye Chen ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Fast Response ◽  
Dual Frequency

Terahertz dielectric anisotropy enhancement in dual-frequency liquid crystal induced by carbon nanotubes

Carbon ◽  
2019 ◽  
Vol 152 ◽  
pp. 865-872 ◽  
Author(s):  
Yun-Yun Ji ◽  
Fei Fan ◽  
Shi-Tong Xu ◽  
Jian-Ping Yu ◽  
Yan Liu ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Liquid Crystal ◽  
Dielectric Anisotropy ◽  
Dual Frequency

scholarly journals High Contrast and Fast Response Polarization-Independent Reflective Display Using a Dye-Doped Dual-Frequency Liquid Crystal Gel

2006 ◽  
Vol 453 (1) ◽  
pp. 371-378 ◽  
Author(s):  
Yi-Hsin Lin ◽  
Hongwen Ren ◽  
Sebastian Gauza ◽  
Yung-Hsun Wu ◽  
Ying Zhou ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Fast Response ◽  
High Contrast ◽  
Dual Frequency ◽  
Reflective Display ◽  
Polarization Independent

scholarly journals Fast-Response Liquid Crystal for Spatial Light Modulator and LiDAR Applications

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 93
Author(s):  
Junyu Zou ◽  
Qian Yang ◽  
En-Lin Hsiang ◽  
Haruki Ooishi ◽  
Zhuo Yang ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Spatial Light Modulator ◽  
Fast Response ◽  
Blue Laser ◽  
Dielectric Anisotropy ◽  
Light Modulator ◽  
High Brightness ◽  
High Birefringence ◽  
Low Viscosity ◽  
Liquid Crystal On Silicon

We report a new nematic mixture for liquid-crystal-on-silicon spatial light modulator (SLM) and light detection and ranging (LiDAR) applications. The mixture exhibits a relatively high birefringence (Δn), moderate dielectric anisotropy (Δɛ), low viscosity, and reasonably good photostability. To achieve 2π phase change at 5 V, the response time (on + off) is 2.5 ms at 40 °C with λ = 633 nm, and 5.9 ms with λ = 905 nm. After exposure by a blue laser (λ = 465 nm) with a total dosage up to 20 MJ/cm2, this mixture shows no sign of photodegradation. Widespread applications of this material for high brightness SLMs, LiDAR, near-eye displays, and head-up displays are foreseeable.

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