Deformed Helix Ferroelectric Liquid Crystals with Large Tilt Angles in Optically Addressed Spatial Light Modulators for Dynamical Holography Applications

1997 ◽  
Vol 488 ◽  
Author(s):  
L. A. Beresnev ◽  
W. Haase ◽  
A. P. Onokhov ◽  
W. Dultz ◽  
M. V. Isaev ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Liquid Crystals ◽  
Amorphous Silicon ◽  
Diffraction Efficiency ◽  
Optical Axis ◽  
Polymeric Films ◽  
Spatial Light Modulators ◽  
Ferroelectric Liquid Crystals ◽  
Holographic Image ◽  
Light Modulators

AbstractOptically addressed spatial light modulators (OASLMs) based on deformed helix ferroelectric liquid crystals (DHFLC) with high tilt angles on order of 40° and helical pitches less than 0.2μm were developed. The diffraction efficiency reached the order of 20%. The light induced deviation of the optical axis of the DHFLC layer was measured in sandwich structures consisting of photoconductors and liquid crystals. The photoelectric parameters of photoconductive amorphous silicon carbide a-SiC:H and a photoconductive polymeric films were measured with and without light blocking and reflecting layers. The application of the developed OASLMs in a holographic image corrector was demonstrated.

Advances in ferroelectric liquid crystals for high-speed spatial-light modulators

1994 ◽  
Author(s):  
A. L. Andreev ◽  
Natalia I. Chernova ◽  
Igor N. Kompanets ◽  
M. V. Loseva ◽  
Alexander V. Parfenov ◽  
...  
Keyword(s):  
Liquid Crystals ◽  
High Speed ◽  
Spatial Light Modulators ◽  
Ferroelectric Liquid Crystals ◽  
Light Modulators

Amorphous Silicon-Carbon Thin Film P-I-N Structures for Liquid-Crystal Spatial Light Modulators

1996 ◽  
Vol 420 ◽  
Author(s):  
N. A. Feoktistov ◽  
N. L. Ivanova ◽  
L. E. Morozova ◽  
Yu. A. Nikulin ◽  
A. P. Onokhov ◽  
...  
Keyword(s):  
Light Intensity ◽  
Amorphous Silicon ◽  
Diffraction Efficiency ◽  
Carbon Films ◽  
Spatial Light Modulators ◽  
Frequency Range ◽  
Light Modulators ◽  
Operation Speed ◽  
Silicon Carbon ◽  
Hydrogenated Amorphous

AbstractPhotoaddressed spatial light modulators (PSLM) based on nematic liquid crystals using hydrogenated amorphous silicon-carbon films (a-Si1-xCx,:H) and p-i-n structures as photosensitive layers are designed and studied. It is shown that an application of a-Si1-xCx:H p-i-n diodes greatly improved the operation speed of a PSLM, increased the film transparency and decreased the absorption of the red readout light. As a result, the readout light intensity could become ≈ 20 times larger. The maximum diffraction efficiency of the PSLM was achieved for a write-in light intensity of 40μLW/cm2, with a resolution (FWHM) of the diffraction efficiency of 54 mm-1. The optical response of the PSLM was observed in the frequency range from 1 Hz to 100 Hz.

scholarly journals Diffraction Efficiency Characteristics for MEMS-Based Phase-Only Spatial Light Modulator with Nonlinear Phase Distribution

Photonics ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 62
Author(s):  
Remington S. Ketchum ◽  
Pierre-Alexandre Blanche
Keyword(s):  
Diffraction Efficiency ◽  
High Speed ◽  
Phase Distribution ◽  
Complex Structure ◽  
Spatial Light Modulators ◽  
Light Modulator ◽  
Micro Electro Mechanical Systems ◽  
Light Modulators ◽  
Nonlinear Phase ◽  
Liquid Crystal On Silicon

Micro-electro mechanical systems (MEMS)-based phase-only spatial light modulators (PLMs) have the potential to overcome the limited speed of liquid crystal on silicon (LCoS) spatial light modulators (SLMs) and operate at speeds faster than 10 kHz. This expands the practicality of PLMs to several applications, including communications, sensing, and high-speed displays. The complex structure and fabrication requirements for large, 2D MEMS arrays with vertical actuation have kept MEMS-based PLMs out of the market in favor of LCoS SLMs. Recently, Texas Instruments has adapted its existing DMD technology for fabricating MEMS-based PLMs. Here, we characterize the diffraction efficiency for one of these PLMs and examine the effect of a nonlinear distribution of addressable phase states across a range of wavelengths and illumination angles.

Light modulators based on polymer-dispersed ferroelectric liquid crystals

1996 ◽  
Author(s):  
S. L. Smorgon ◽  
V. Y. Zyryanov ◽  
V. F. Shabanov ◽  
Eugene P. Pozhidaev
Keyword(s):  
Liquid Crystals ◽  
Ferroelectric Liquid Crystals ◽  
Light Modulators ◽  
Polymer Dispersed

scholarly journals Helix-Free Ferroelectric Liquid Crystals: Electro Optics and Possible Applications

2018 ◽  
Vol 8 (12) ◽  
pp. 2429 ◽  
Author(s):  
Alexander Andreev ◽  
Tatiana Andreeva ◽  
Igor Kompanets ◽  
Nikolay Zalyapin
Keyword(s):  
Liquid Crystals ◽  
Low Voltage ◽  
Light Transmission ◽  
Optical Response ◽  
Phase Delay ◽  
High Rate ◽  
Ferroelectric Liquid Crystals ◽  
Light Modulators ◽  
Director Reorientation ◽  
Smooth Dependence

This is a review of results from studying ferroelectric liquid crystals (FLCs) of a new type developed for fast low-voltage displays and light modulators. These materials are helix-free FLCs, which are characterized by spatially periodic deformation of smectic layers and a small value of spontaneous polarization (less than 50 nC/cm2). The FLC director is reoriented due to the motion of solitons at the transition to the Maxwellian mechanism of energy dissipation. A theoretical model is proposed for describing the FLC deformation and director reorientation. The frequency and field dependences of the optical response time are studied experimentally for modulation of light transmission, scattering, and phase delay with a high rate. The hysteresis-free nature and smooth dependence of the optical response on the external electric field in the frequency range up to 6 kHz is demonstrated, as well as bistable light scattering with memorization of an optical state for a time exceeding the switching time by up to 6 orders of magnitude. Due to the spatially inhomogeneous light phase delay, the ability of a laser beam to cause interference is effectively suppressed. The fastest FLCs under study are compatible with 3D, FLC on Silicon (FLCoS), and Field Sequential Colors (FSC) technologies.

Sign in / Sign up

Export Citation Format

Share Document