Effect of phase valley on diffraction efficiency of liquid crystal optical phased array

摘要：

The discreteness of driving electrodes in liquid crystal optical phased array (LCOPA) device causes phase valley in the region between two adjacent electrodes. When a one-dimensional transmission-type LCOPA device was used, there was a pair of diffraction sidelobes with considerable intensity on either side of the deflected beam, which decreased the diffraction efficiency of deflected beam greatly. An analytical numerical model of phase valley was proposed for the quantitative analytic analysis on diffraction efficiency. Results showed that phase valley is the cause for diffraction sidelobes. The diffraction efficiency of deflected beam decreases steeply as the phase valley depth increases. When valley depth decreases close to zero, the main factor having affect on diffraction efficiency turns to be flyback region size. The influence of electrode space on diffraction efficiency was quantitatively analyzed as well. An effective way to reduce or even eliminate the phase valley is to reduce the space between electrodes.

关键词： liquid crystal optical phased array (LCOPA) phase valley diffraction efficiency numerical model

作者: Xu Lin Wu Li-ying Zhang Jian Liu Xiang

作者单位: School of Electrical Engineering and Automation, Harbin Institute of Technology,Harbin 150080, China School of Electrical Engineering and Automation, Harbin Institute of Technology, Harbin 150080, Chin

会议类型: 国际会议

会议名称: 第五届仪器科学与技术国际学术会议(ISIST 2008)Fifth International Symposium on Instrmentation Science and Technology

会议地点: 沈阳

会议语种:英文

页码: 1-8

在线出版日期: 2008-09-15（万方平台首次上网日期，不代表论文的发表时间）