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基于微反射镜阵列的光刻照明模式变换系统设计

Illumination Mode Conversion System Design Based on Micromirror Array in Lithography

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摘要

光源掩膜协同优化是45 nm节点以下浸没式光刻提高分辨率的重要途径之一,为了重构其优化后输出的像素级光源,提出了一种基于可寻址二维微反射镜阵列的新型照明模式变换系统设计方法。分析了减少重构光源所需微反射镜数量的原理,结合成像与非成像光学,利用柱面复眼透镜,获得了入射到微反射镜阵列上的非均匀的特定光强分布,基于此光强分布对微及射镜二维偏转角度进行了模拟及优化,并对该照明模式变换系统进行仿真,结果表明,光瞳重构精度小于2.5%,X,Y 方向光瞳极平衡性小于0.5%,Prolith中重构光源的曝光性能仿真结果满足要求。与类似的系统相比,该系统仅用不足4000个镜单元即可达到设计要求,适用于集成度高的下一代浸没式光刻系统。

Abstract

Source and mask co-optimization is one of the most important resolution enhancement solutions in immersion lithography for nodes 45 nm and below. In order to reconstruct the optimum output pixelated source, a novel illumination mode conversion system design method based on a two-dimensional addressable micro-mirror array is proposed. The principle of reducing the number of micro-mirror required to reconstruct the source is analyzed, combing imaging and non-imaging optics, using cylindrical fly-eye lens to achieve the specific nonuniform intensity distribution on micro- mirror array. Based on this, optimization of each title angle of micro-mirror is programmed and the whole system is simulated. The results show the accuracy of the reconstructed source is less than 2.5 %, and pupil non-balance X,Y is below 0.5 %. The simulation results of reconstructed source with Prolith meets the design requirements. Compared with similar systems, the system ensures that the accuracy of reconstructed source with less than 4000 micro- mirror element, it′ s suitable for high integration of the next generation of immersion lithography system.

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中图分类号:TN305.7

DOI:10.3788/aos201535.1111002

所属栏目:成像系统

责任编辑:韩峰  信息反馈

基金项目:国家科技重大专项(2012ZX02701)

收稿日期:2015-04-29

修改稿日期:2015-06-25

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作者单位    点击查看

邢莎莎:中国科学院光电技术研究所, 四川 成都 610209
冉英华:中国科学院光电技术研究所, 四川 成都 610209
江海波:中国科学院光电技术研究所, 四川 成都 610209
邢廷文:中国科学院光电技术研究所, 四川 成都 610209

联系人作者:邢莎莎(drizzlyrain3@163.com)

备注:邢莎莎(1987—),女,硕士,助理研究员, 主要从事光学设计和照明方面的研究。

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引用该论文

Xing Shasha,Ran Yinghua,Jiang Haibo,Xing Tingwen. Illumination Mode Conversion System Design Based on Micromirror Array in Lithography[J]. Acta Optica Sinica, 2015, 35(11): 1111002

邢莎莎,冉英华,江海波,邢廷文. 基于微反射镜阵列的光刻照明模式变换系统设计[J]. 光学学报, 2015, 35(11): 1111002

被引情况

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【2】吴政南,谢江容,杨雁南. 光强均匀度对GaAs电池组光电转换效率的影响. 红外与激光工程, 2017, 46(6): 606001--1

【3】佟军民,刘俊伯,胡松. 基于塔尔博特自成像光刻机的照明系统设计与分析. 激光与光电子学进展, 2017, 54(8): 82201--1

【4】孟晶晶,余锦,貊泽强,王金舵,代守军,王晓东. 光束积分激光空间整形技术. 激光与光电子学进展, 2019, 56(13): 130002--1

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