激光与光电子学进展, 2019, 56 (16): 162201, 网络出版: 2019-08-05   

介电润湿液体棱镜阵列的三维空间光束指向控制 下载: 1494次

Beam Steering Control of Liquid Prism Array Based on Electrowetting-on-Dielectric in Three-Dimensional Space
作者单位
南京邮电大学电子与光学工程学院微流控光学技术研究中心, 江苏 南京 210023
摘要
为实现三维空间光束指向控制,提出了一种基于介电润湿效应的液体棱镜阵列系统。根据几何光学和介电润湿理论,推导并分析了光束转向角与液体棱镜单元的最大偏转角、介电润湿接触角、棱镜单元间距及液体折射率等因素之间的关系;通过COMSOL构建介电润湿液体棱镜阵列模型,仿真了电压控制下液体棱镜单元内双液体界面面型的变化过程,模拟再现了该液体棱镜阵列对光束指向的控制特性。结果表明,基于介电润湿技术的液体光学棱镜阵列在一定范围内可实现对光束指向的连续控制。通过选取特定的液体组合,饱和接触角降低到45°,棱镜单元的光束转向范围可提高到28°(-14°~14°)。当光轴间距r为6 mm时,液体棱镜阵列系统可以实现在28°圆锥区域内的连续控制,且圆锥顶点位于Z轴22.58 mm位置处。
Abstract
To control the light steering direction in three-dimensional space, a liquid prism array system based on electrowetting-on-dielectric (EWOD) is proposed. According to the geometrical optics and EWOD theory, the relationships among the beam steering angle, maximum beam steering angle, EWOD contact angle, interval between adjacent prisms, and liquid refractive index are analyzed and discussed. A theoretical model of an EWOD liquid prism array is constructed in COMSOL. Then, the evolution of the double liquid interface in the liquid prism unit is simulated under different voltages. The beam steering control characteristics of the liquid prism array are simulated. Results demonstrate that the EWOD based liquid prism array can realize continuous beam steering control in a certain range. By selecting a specific combination of liquids, the saturation contact angle can decrease to 45°, and consequently the range of beam steering angle for the liquid prism unit reaches 28° (from -14° to 14°). As the optical axis spacing r is set to 6 mm, the steering region of the liquid prism array system is in a conical region whose apex angle is 28°, and the corresponding vertex of the cone is located at Z=22.58 mm in the Z-axis.

杨龙啸, 赵瑞, 孔梅梅, 陈陶, 关建飞, 梁忠诚. 介电润湿液体棱镜阵列的三维空间光束指向控制[J]. 激光与光电子学进展, 2019, 56(16): 162201. Longxiao Yang, Rui Zhao, Meimei Kong, Tao Chen, Jianfei Guan, Zhongcheng Liang. Beam Steering Control of Liquid Prism Array Based on Electrowetting-on-Dielectric in Three-Dimensional Space[J]. Laser & Optoelectronics Progress, 2019, 56(16): 162201.

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