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.

scholarly journals Fast-Response Liquid Crystal Phase Modulators with an Excellent Photostability

Crystals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 765 ◽  
Author(s):  
Qian Yang ◽  
Junyu Zou ◽  
Yannanqi Li ◽  
Shin-Tson Wu
Keyword(s):  
Liquid Crystal ◽  
Fast Response ◽  
Laser Wavelength ◽  
Blue Laser ◽  
Spatial Light Modulators ◽  
High Brightness ◽  
Light Modulators ◽  
Phase Modulators ◽  
Liquid Crystal On Silicon ◽  
Measured Response

We report a new mixture, which is modified from Merck TL-216, for liquid-crystal-on-silicon spatial light modulators (SLMs). To achieve 2π phase change at λ = 633 nm with 5 V operation voltage, the measured response time is about 3 ms at 50 °C. Meanwhile, our mixture exhibits no sign of photodegradation and even the total dosage has exceeded 400 MJ/cm2 at a blue laser wavelength λ = 465 nm. In comparison, E7 died at about 30 MJ/cm2. Widespread applications of this material for high brightness SLMs, near-eye displays, and head-up displays are foreseeable.

scholarly journals Phase Compensation of the Non-Uniformity of the Liquid Crystal on Silicon Spatial Light Modulator at Pixel Level

Sensors ◽  
2021 ◽  
Vol 21 (3) ◽  
pp. 967
Author(s):  
Zhen Zeng ◽  
Zexiao Li ◽  
Fengzhou Fang ◽  
Xiaodong Zhang
Keyword(s):  
Liquid Crystal ◽  
Phase Modulation ◽  
Spatial Light Modulator ◽  
Characteristic Curve ◽  
Physical Structure ◽  
Measuring System ◽  
Light Modulator ◽  
Phase Compensation ◽  
Modulation Characteristic ◽  
Liquid Crystal On Silicon

Phase compensation is a critical step for the optical measuring system using spatial light modulator (SLM). The wavefront distortion from SLM is mainly caused by the phase modulation non-linearity and non-uniformity of SLM’s physical structure and environmental conditions. A phase modulation characteristic calibration and compensation method for liquid crystal on silicon spatial light modulator (LCoS-SLM) with a Twyman-Green interferometer is illustrated in this study. A method using two sequences of phase maps is proposed to calibrate the non-uniformity character over the whole aperture of LCoS-SLM at pixel level. A phase compensation matrix is calculated to correct the actual phase modulation of the LCoS-SLM and ensure that the designed wavefront could be achieved. Compared with previously known compensation methods, the proposed method could obtain the phase modulation characteristic curve of each pixel on the LCoS-SLM, rather than a mono look-up table (LUT) curve or multi-LUT curves corresponding to an array of blocks over the whole aperture of the LCoS-SLM. The experiment results show that the phase compensation precision could reach a peak-valley value of 0.061λ in wavefront and this method can be applied in generating freeform wave front for precise optical performance.

Holographic three-dimensional displays with liquid crystal on silicon spatial light modulator

2004 ◽  
Author(s):  
Aneta Michalkiewicz ◽  
Malgorzata Kujawinska ◽  
Tomasz Kozacki ◽  
Xinghua Wang ◽  
Philip J. Bos
Keyword(s):  
Liquid Crystal ◽  
Spatial Light Modulator ◽  
Three Dimensional ◽  
Light Modulator ◽  
Liquid Crystal On Silicon

Mesomorphic, dielectric, and optical properties of fluorosubstituted biphenyls, terphenyls, and quaterphenyls

2008 ◽  
Vol 16 (4) ◽  
Author(s):  
P. Kula ◽  
A. Spadło ◽  
J. Dziaduszek ◽  
M. Filipowicz ◽  
R. Dąbrowski ◽  
...  
Keyword(s):  
Optical Properties ◽  
Liquid Crystal ◽  
Dielectric Anisotropy ◽  
Polar Group ◽  
The Novel ◽  
Vertical Alignment ◽  
Rigid Core ◽  
High Birefringence ◽  
Low Viscosity ◽  
Dielectric And Optical Properties

AbstractCompounds with moderate and large negative dielectric anisotropy (Δɛ) are very attractive liquid crystal (LC) for vertical alignment mode (VA). Materials with such properties can be achieved by lateral substitution of a polar group into a mesogenic molecule. We synthesized some new LC materials with a negative value of Δɛ, a moderately high birefringence (Δn), and a low viscosity. The mesomorphic and physical behaviour of the novel biphenyls, terphenyls and quaterphenyls fluorosubstituted in the rigid core and also with fluorinated alkyl and alkoxy chains are investigated. The prepared series of four LC compounds are promising for new LC mixtures for various applications. Examples of nematic mixtures with Δɛ∼−3.25 will be presented.

Electrically addressed 256 by 256 liquid-crystal-on-silicon spatial light modulator

1993 ◽  
Vol 18 (24) ◽  
pp. 2159 ◽  
Author(s):  
Douglas J. McKnight ◽  
Roylnn A. Serati ◽  
Kristina M. Johnson
Keyword(s):  
Liquid Crystal ◽  
Spatial Light Modulator ◽  
Light Modulator ◽  
Liquid Crystal On Silicon
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