Wide-angle nonmechanical beam steering using thin liquid crystal polarization gratings

2008 ◽  
Author(s):  
Jihwan Kim ◽  
Chulwoo Oh ◽  
Michael J. Escuti ◽  
Lance Hosting ◽  
Steve Serati
Keyword(s):  
Liquid Crystal ◽  
Beam Steering ◽  
Wide Angle ◽  
Polarization Gratings

Large-aperture, wide-angle nonmechanical beam steering using polarization gratings

2016 ◽  
Vol 56 (3) ◽  
pp. 031211 ◽  
Author(s):  
Steven Serati ◽  
Christopher L. Hoy ◽  
Lance Hosting ◽  
Kelly Kluttz ◽  
Jay Stockley ◽  
...  
Keyword(s):  
Beam Steering ◽  
Wide Angle ◽  
Large Aperture ◽  
Polarization Gratings

Improved high order grating method to realize wide angle beam steering on liquid crystal optical phased array

2015 ◽  
Author(s):  
Liang Wu ◽  
Xiangru Wang ◽  
Caidong Xiong ◽  
Ziqiang Huang ◽  
Jing Du ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Phased Array ◽  
Beam Steering ◽  
High Order ◽  
Wide Angle ◽  
Optical Phased Array

scholarly journals Tunable Polarization Gratings Based on Nematic Liquid Crystal Mixtures Photoaligned with Azo Polymer-Coated Substrates

Crystals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 768 ◽  
Author(s):  
Mateusz Nieborek ◽  
Katarzyna Rutkowska ◽  
Tomasz Ryszard Woliński ◽  
Bartosz Bartosewicz ◽  
Bartłomiej Jankiewicz ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystalline ◽  
Near Infrared ◽  
Beam Steering ◽  
Incident Beam ◽  
Molecular Reorientation ◽  
Electric Voltage ◽  
Azo Polymer ◽  
Order Diffraction ◽  
Polarization Gratings

Liquid crystal polarization gratings are of great interest for optical communications as elements performing beam steering, splitting, multiplexing or beam combining. Material birefringence, cell thickness or a period of the liquid crystal director pattern influence, among other features, spectroscopic and electro-optical characteristics of fabricated devices, determining thus their functionality and applicability. Here, we report on liquid crystal polarization gratings that allow for complete maximization of the first-order diffraction efficiency (resulting in total elimination of the zeroth-order diffraction) for any wavelength of an incident beam from green to the near-infrared spectral region by applying a low electric voltage. The gratings with periods as small as 10 μm were obtained by holographic exposure of the cell substrates coated with light-sensitive azo polymer alignment layers, and then filled with three different liquid crystal mixtures. The influence of gold nanoparticle dopants in the liquid crystalline mixtures on spectroscopic and electro-optical properties of the devices is presented. Moreover, on the basis of the measured transmittance spectra of the fabricated gratings, the unknown birefringence of liquid crystal mixtures as well as their effective birefringence due to molecular reorientation in the electric field in the visible and near IR region were determined.

Wide-angle, nonmechanical beam steering with high throughput utilizing polarization gratings

2011 ◽  
Vol 50 (17) ◽  
pp. 2636 ◽  
Author(s):  
Jihwan Kim ◽  
Chulwoo Oh ◽  
Steve Serati ◽  
Michael J. Escuti
Keyword(s):  
High Throughput ◽  
Beam Steering ◽  
Wide Angle ◽  
Polarization Gratings

scholarly journals Liquid Crystal Devices for Beam Steering Applications

Micromachines ◽  
2021 ◽  
Vol 12 (3) ◽  
pp. 247
Author(s):  
Rowan Morris ◽  
Cliff Jones ◽  
Mamatha Nagaraj
Keyword(s):  
Liquid Crystal ◽  
Liquid Crystals ◽  
Adaptive Optics ◽  
Beam Steering ◽  
Optical Components ◽  
Advantages And Disadvantages ◽  
Liquid Crystal Devices

Liquid crystals are valuable materials for applications in beam steering devices. In this paper, an overview of the use of liquid crystals in the field of adaptive optics specifically for beam steering and lensing devices is presented. The paper introduces the properties of liquid crystals that have made them useful in this field followed by a more detailed discussion of specific liquid crystal devices that act as switchable optical components of refractive and diffractive types. The relative advantages and disadvantages of the different devices and techniques are summarised.

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