Mr. Jianhua Zhou Profile

Jianhua Zhou

at UESTC

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Proceedings Article | 21 August 2013 Paper

Improved beam steering efficiency of large deflection angle for periodic grating

Jian-hua Zhou, Ling-jiang Kong, Feng Xiao, Jing-yi Zhuo, Xiao-bo Yang

Proceedings Volume 8906, 89061K (2013) https://doi.org/10.1117/12.2033705

KEYWORDS: Diffraction, Beam steering, Optimization (mathematics), Laser energy, Diffraction gratings, Energy efficiency, Detection and tracking algorithms, Computer simulations, Quantization, Liquid crystals

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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.

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