Design and experimental demonstration on improved high order grating for wide angle beam steering of liquid crystal optical phased array

2017 ◽  
Author(s):  
Liang Wu ◽  
Xiangru Wang ◽  
Caidong Xiong ◽  
Ziqiang Huang
Keyword(s):  
Liquid Crystal ◽  
Phased Array ◽  
Beam Steering ◽  
High Order ◽  
Wide Angle ◽  
Experimental Demonstration ◽  
Optical Phased Array

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 Theoretical and Experimental Demonstration on Grating Lobes of Liquid Crystal Optical Phased Array

2016 ◽  
Vol 2016 ◽  
pp. 1-6
Author(s):  
Xiangru Wang ◽  
Liang Wu ◽  
Man Li ◽  
Shuanghong Wu ◽  
Jiyang Shang ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Theoretical Model ◽  
Theoretical Analysis ◽  
Phased Array ◽  
High Order ◽  
Main Lobe ◽  
Experimental Demonstration ◽  
Optical Phased Array ◽  
Fringe Effect ◽  
Good Agreement

High deflection efficiency is one of the urgent requirements for practical liquid crystal optical phased array (LC-OPA). In this paper, we demonstrate that high order grating lobes induced from fringe effect are the most important issue to reduce occupation of main lobe. A novel theoretical model is developed to analyze the feature of grating lobes when the device of LC-OPA is working on the scheme of variable period grating (VPG) or variable blazing grating (VBG). Subsequently, our experiments present the relevant results showing a good agreement with the theoretical analysis.

scholarly journals A Design Approach of Optical Phased Array with Low Side Lobe Level and Wide Angle Steering Range

Photonics ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 63
Author(s):  
Xinyu He ◽  
Tao Dong ◽  
Jingwen He ◽  
Yue Xu
Keyword(s):  
Phased Array ◽  
Phase Distribution ◽  
Beam Steering ◽  
Side Lobe ◽  
Design Approach ◽  
Optical Antennas ◽  
Side Lobe Level ◽  
Wide Angle ◽  
Spacing Distribution ◽  
Optical Phased Array

In this paper, a new design approach of optical phased array (OPA) with low side lobe level (SLL) and wide angle steering range is proposed. This approach consists of two steps. Firstly, a nonuniform antenna array is designed by optimizing the antenna spacing distribution with particle swarm optimization (PSO). Secondly, on the basis of the optimized antenna spacing distribution, PSO is further used to optimize the phase distribution of the optical antennas when the beam steers for realizing lower SLL. Based on the approach we mentioned, we design a nonuniform OPA which has 1024 optical antennas to achieve the steering range of ±60°. When the beam steering angle is 0°, 20°, 30°, 45° and 60°, the SLL obtained by optimizing phase distribution is −21.35, −18.79, −17.91, −18.46 and −18.51 dB, respectively. This kind of OPA with low SLL and wide angle steering range has broad application prospects in laser communication and lidar system.

Beam Pointing Precision Control by Using a Liquid Crystal Optical Phased Array

2010 ◽  
Vol 437 ◽  
pp. 344-348 ◽  
Author(s):  
Li Ying Wu ◽  
Jian Zhang ◽  
Yun Fang
Keyword(s):  
Liquid Crystal ◽  
Phased Array ◽  
Beam Steering ◽  
Incident Beam ◽  
Electric System ◽  
New Device ◽  
Energy Consuming ◽  
Extraordinary Refractive Index ◽  
Optical Phased Array ◽  
Pointing Precision

For laser beam steering, a pure optical-electric system without mechanical or inertial parts is used. The new device is a Liquid Crystal Optical Phased Array (LCOPA). Supplying electric field to liquid crystal cell with electrodes, the extraordinary refractive index changes, which results in phase shift that modulates the direction of incident beam. The advantages of this device are small size, less energy consuming, programmable and addressable control. A one dimensional device is designed and tested. The resolution of the steering angle is 20 μrad, the range is ±2o. The effect of flyback region and phase valley on diffraction efficiency is also discussed briefly.

scholarly journals Wide-Angle Beam-Steering Using an Optical Phased Array with Non-Uniform-Width Waveguide Radiators

Photonics ◽  
2020 ◽  
Vol 7 (3) ◽  
pp. 56
Author(s):  
Youngin Kim ◽  
Hyeonho Yoon ◽  
Jong-Bum You ◽  
Minchul Kim ◽  
Hyo-Hoon Park
Keyword(s):  
Phased Array ◽  
Beam Steering ◽  
Side Lobe ◽  
Phase Shifters ◽  
Wide Angle ◽  
Half Wavelength ◽  
Electro Optic ◽  
Optical Phased Array ◽  
Diffraction Patterns ◽  
Silicon Based

We demonstrate wide-angle beam-steering using an optical phased array (OPA) with waveguide radiators designed with non-uniform widths to reduce the crosstalk between waveguides. The OPA consists of a silicon based 1 × 16 array of electro-optic phase shifters and end-fire radiators. The 16 radiators were configured with four different widths and a half-wavelength spacing, which can remove the higher-order diffraction patterns in free space. The waveguides showed a low crosstalk of −10.2 dB at a wavelength of 1540 nm. With phase control, the OPA achieved wide beam-steering of over ±80° with a side-lobe suppression of 7.4 dB.

Fast beam steering with a ferroelectric-liquid-crystal optical phased array

2009 ◽  
Vol 48 (9) ◽  
pp. 1721 ◽  
Author(s):  
David Engström ◽  
Michael J. O'Callaghan ◽  
Chris Walker ◽  
Mark A. Handschy
Keyword(s):  
Liquid Crystal ◽  
Phased Array ◽  
Beam Steering ◽  
Ferroelectric Liquid Crystal ◽  
Optical Phased Array
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