Share Email Print
cover

Proceedings Paper

Improved beam steering efficiency of large deflection angle for periodic grating
Author(s): Jian-hua Zhou; Ling-jiang Kong; Feng Xiao; Jing-yi Zhuo; Xiao-bo Yang
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

The limited quantization digit of voltage and the effect of fringing field between adjacent electrodes (phased-array controlling units) limit the deflection efficiency when a Liquid-Crystal Phased Array (LCPA) is used for beam steering. In this paper, an optimization algorithm named pattern search is proposed to improve the diffraction efficiency. This algorithm directly optimizes the step phase slope to obtain high diffraction efficiency, rather than discussing the complex relationship between the diffraction efficiency and various influence factors. Besides, other optimization algorithms based on phase retrieval, such as GS, need the entire energy distribution; however, it is hard to obtain in practical. Our algorithm need only the energy of the target diffraction point and it can be easily realized. Firstly, we construct the model for beam steering, and point out that the deformation of the phase slope by influence factors is the reason why conventional method can not realize high diffraction efficiency. Secondly, we construct an optimization model for the issues and apply the pattern search algorithm to optimize the diffraction efficiency. The simulation results show high performance of our algorithm comparing with the conventional steering method. Finally, a set of beam steering experiments were performed with a one-dimensional LCPA being set both according to the un-optimized and the optimized recipe, and the results were in very good agreement with the theoretical predictions. We show that the deflection efficiency can be drastically improved.

Paper Details

Date Published: 21 August 2013
PDF: 10 pages
Proc. SPIE 8906, International Symposium on Photoelectronic Detection and Imaging 2013: Laser Communication Technologies and Systems, 89061K (21 August 2013); doi: 10.1117/12.2033705
Show Author Affiliations
Jian-hua Zhou, Univ. of Electronic Science and Technology of China (China)
Ling-jiang Kong, Univ. of Electronic Science and Technology of China (China)
Feng Xiao, Univ. of Electronic Science and Technology of China (China)
Jing-yi Zhuo, Univ. of Electronic Science and Technology of China (China)
Xiao-bo Yang, Univ. of Electronic Science and Technology of China (China)


Published in SPIE Proceedings Vol. 8906:
International Symposium on Photoelectronic Detection and Imaging 2013: Laser Communication Technologies and Systems
Keith E. Wilson; Jing Ma; Liren Liu; Huilin Jiang; Xizheng Ke, Editor(s)

© SPIE. Terms of Use
Back to Top