光学学报, 2017, 37 (10): 1012006, 网络出版: 2018-09-07
用于扫描干涉场曝光的超精密微动台设计与控制 下载: 811次
Design and Control of Ultra-Precision Fine Positioning Stage for Scanning Beam Interference Lithography
测量 扫描干涉场曝光 微动台 条纹周期测量精度 相位锁定 measurement scanning beam interference lithography fine positioning stage fringe period measurement accuracy phase locking
摘要
扫描干涉场曝光(SBIL)系统中曝光效果与工件台的运动性能密切相关。为了制作纳米精度的大面积平面光栅,工件台采用了粗微叠层结构设计,其中微动台是实现工件台运动精度的关键。基于SBIL原理,推导了干涉条纹周期测量精度与曝光对比度的关系。针对移动分光镜测量干涉条纹周期的方法,结合周期测量精度需求,分析了微动台定位精度指标,提出了实现微动台x 、y 、θz 三个自由度定位精度的控制器设计方法,并在微动台系统上进行了实验验证。结果表明,微动台x 方向定位精度可达±1.51 nm,y 方向定位精度可达±5.46 nm,θz 定位精度可达±0.02 μrad,可以满足SBIL的需求和干涉条纹周期测量的精度要求。
Abstract
Exposure result of scanning beam interference lithography (SBIL) system is closely related to the movement property of the stage. The stage adopts coarse-fine dual stage mechanism to fabricate large-area plane grating with nanometer accuracy. The fine stage is the key point of the movement accuracy of the stage. According to the principle of SBIL, the relationship between interference fringe period measurement accuracy and exposure contrast is deduced. For the period measurement method of interference fringe by moving beam-splitter, the positioning accuracy index of the fine positioning stage is analyzed by considering period measurement accuracy requirements. A controller design method is proposed to realize the positioning accuracies of the degrees of freedom in x, y, θz directions. And the experiment is conducted in the fine positioning stage system. The results show that the positioning accuracy of x, y, θz can achieved ±1.51 nm, ±5.46 nm and ±0.02 μrad, respectively, which can satisfy the SBIL exposure requirements and the interference fringe period measurement accuracy requirements.
鲁森, 杨开明, 朱煜, 王磊杰, 张鸣, 杨进. 用于扫描干涉场曝光的超精密微动台设计与控制[J]. 光学学报, 2017, 37(10): 1012006. Sen Lu, Kaiming Yang, Yu Zhu, Leijie Wang, Ming Zhang, Jin Yang. Design and Control of Ultra-Precision Fine Positioning Stage for Scanning Beam Interference Lithography[J]. Acta Optica Sinica, 2017, 37(10): 1012006.