scholarly journals Non-Mechanical Beam Steering with Polarization Gratings: A Review

Crystals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 361
Author(s):  
Christopher Hoy ◽  
Jay Stockley ◽  
Janelle Shane ◽  
Kelly Kluttz ◽  
Douglas McKnight ◽  
...  
Keyword(s):  
Optical Communications ◽  
Beam Steering ◽  
Active Sensing ◽  
Polarization Gratings

Polarization gratings (PGs) enable a novel architecture for dynamic non-mechanical steering of light over large angles and with large clear apertures. This beam steering approach has many applications in active sensing and optical communications. In this review, we describe some of the defining characteristics of this beam steering architecture and highlight several applications of the technology.

Polarized beam steering using multiply-cascaded rotating polarization gratings

2021 ◽  
Author(s):  
Moritsugu Sakamoto ◽  
Huynh Thanh Nhan ◽  
Kohei Noda ◽  
Tomoyuki Sasaki ◽  
Tadayoshi Kamei ◽  
...  
Keyword(s):  
Beam Steering ◽  
Polarization Gratings ◽  
Polarized Beam

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

High-Throughput Continuous Beam Steering Using Rotating Polarization Gratings

2010 ◽  
Vol 22 (4) ◽  
pp. 200-202 ◽  
Author(s):  
Chulwoo Oh ◽  
Jihwan Kim ◽  
John Muth ◽  
Steve Serati ◽  
Michael J. Escuti
Keyword(s):  
High Throughput ◽  
Beam Steering ◽  
Continuous Beam ◽  
Polarization Gratings

Demonstration of large-angle nonmechanical laser beam steering based on LC polymer polarization gratings

2011 ◽  
Author(s):  
Jihwan Kim ◽  
Matthew N. Miskiewicz ◽  
Steve Serati ◽  
Michael J. Escuti
Keyword(s):  
Laser Beam ◽  
Beam Steering ◽  
Large Angle ◽  
Polarization Gratings

Polarized beam steering by use of multiply-cascaded rotating polarization gratings with biaxial anisotropy

2021 ◽  
Author(s):  
Moritsugu Sakamoto ◽  
Huynh Thanh Nhan ◽  
Ryusei Momosaki ◽  
Kohei Noda ◽  
Tomoyuki Sasaki ◽  
...  
Keyword(s):  
Beam Steering ◽  
Polarization Gratings ◽  
Polarized Beam

High efficiency quasi-ternary design for nonmechanical beam-steering utilizing polarization gratings

2010 ◽  
Author(s):  
Jihwan Kim ◽  
Matthew N. Miskiewicz ◽  
Steve Serati ◽  
Michael J. Escuti
Keyword(s):  
High Efficiency ◽  
Beam Steering ◽  
Polarization Gratings

Nonmechanical Laser Beam Steering Based on Polymer Polarization Gratings: Design Optimization and Demonstration

2015 ◽  
Vol 33 (10) ◽  
pp. 2068-2077 ◽  
Author(s):  
Jihwan Kim ◽  
Matthew N. Miskiewicz ◽  
Steve Serati ◽  
Michael J. Escuti
Keyword(s):  
Laser Beam ◽  
Design Optimization ◽  
Beam Steering ◽  
Polarization Gratings

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.

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