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计算成像最新工作-6-南京理工大学高志山团队在Light用傅里叶拼接实现高深宽比微沟槽三维形貌无损测量

  • 2026-03-23 11:35:47
计算成像最新工作-6-南京理工大学高志山团队在Light用傅里叶拼接实现高深宽比微沟槽三维形貌无损测量

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基本信息

标题:

Fourier ptychographic coherence scanning interferometry for 3D morphology of high aspect ratio and composite micro-trenches

作者:
Yin Li(南京理工大学电子与光学工程学院);
通讯作者:Qun Yuan(南京理工大学电子与光学工程学院);
Xiao Huo(南京理工大学电子与光学工程学院);
Shumin Wang(南京理工大学电子与光学工程学院);
Hongtao He(中国电子科技集团公司第十三研究所);
通讯作者:高志山(南京理工大学电子与光学工程学院);

发表时间:
2026年1月29日(投稿:2025年09月23日;返修:2026年01月01日;接收:2026年01月09日)

发表期刊:
Light:Science&Applications(JCR=Q1,IF=23.4)

论文重要图文

高深宽比微沟槽和复合微沟槽在先进微制造中很常见,但它们的三维形貌又深又窄、结构还可能分层叠加,用无损光学方法测起来往往会被信噪比和分辨率的矛盾拖住:提高分辨率通常需要更强的光学收集能力,可深结构里的散射和边缘衍射会让干涉条纹变弱,底部信息更难可靠提取。针对这一研究空缺,【南京理工大学团队】提出了FP-CSI:在透射式Linnik干涉结构中,用近红外低相干光源做相干扫描,同时通过移动准点光源引入不同入射角,让样品在不同角度下贡献不同的空间频率信息;每个角度先得到可定量的相位图,再把这些相位图对应的子孔径在傅里叶域进行拼接,最后把拼接后的相位转换成三维高度。直观类比,这相当于先用多次拍摄把细节信息分批收集齐,再把它们在频域里拼成更大的有效孔径,从而在不靠复杂迭代相位恢复的前提下,同时把清晰度和信号稳定性拉上来。论文用多种样品验证:可以测到深度300 um、深宽比可达30:1的微沟槽,并对多层MEMS沟槽结构实现清晰分层与高一致性;在分辨率靶标上能分开1.3 um间距线对,且在模拟沟槽底部仍能保持接近衍射极限的分辨能力。作者强调,FP-CSI的意义在于把深窄结构的无损三维测量从更容易失真、难以稳定重复的状态,推向更适合工艺监控与质量控制的高可信平台,并有望服务于半导体检测、精密制造以及微型光电系统等需要高精度形貌计量的场景。论文以Fourier ptychographic coherence scanning interferometry for 3D morphology of high aspect ratio and composite micro-trenches为题于2026年1月29日发表于Light:Science&Applications期刊。

论文图文

Fig.1 FP-CSI系统的结构与工作原理。

a基于透射式Linnik干涉仪的FP-CSI光学示意图。近红外超辐射发光二极管SLD在不同位置提供准点照明,从而生成不同入射角的照明。参考臂与测试臂以Linnik方式对称配置,包含柯勒照明模块(L1、L2、L5、L6)、近红外物镜(OBJ1–4)与中继透镜(L3、L4、L7、L8)。在测试臂中,小孔与物镜瞳面共轭。参考臂中,压电致动器PZT在轴向扫描时调制光程。此外,补偿片CP(厚度与材料与样品一致)放置在OBJ3与OBJ4的同焦平面处。干涉图经筒镜L9传递并由近红外InGaAs相机Cam采集,作为探测模块。SLD:超辐射发光二极管;BS:分束器;L:透镜;M:反射镜;OBJ:物镜;CP:补偿片;Cam:近红外相机;PZT:压电致动器。b与(a)对应的FP-CSI实验系统实物搭建。c通过平移光纤光源生成不同入射角的准平行照明示意:光源位移越大,入射角越大,对应采样到样品角谱中更高的空间频率分量。

Fig.2使用反射式Linnik与FP-CSI对高深宽比微沟槽(宽30 um、深300 um)的干涉测量对比。

a–d在选定轴向位置(步进delta_phi=pi/2)下的代表性干涉图与对应干涉信号:反射式Linnik在无波前补偿(a)与加入可变形镜补偿(b)时的结果;FP-CSI在法向入射(c,theta=0 deg,NA=0)与斜入射(d,theta=15.8 deg,NA=0.27)下的结果。e未使用小孔滤波时的FP-CSI干涉图,可见明显衍射花纹且对比度下降;对比(c)(d)中使用小孔后的高对比干涉条纹。f从沟槽底部提取的原始干涉信号(theta=8.6 deg,NA=0.15)。g从沟槽底部提取的原始干涉信号(theta=23.5 deg,NA=0.40)。h对(g)做经验模态分解后得到的校正干涉信号。

Fig.3 FP-CSI算法的重建流程。

以宽30 um、深300 um的高深宽比微沟槽为例:步骤1,干涉仪初始化,将样品顶面放在测试臂物镜的同焦平面,并在参考臂放置与样品等厚同材质的补偿片;步骤2,进行轴向与角度扫描获取干涉图;步骤3,使用经验模态分解进行信号校正,并用质心法提取各角度的相位图;步骤4,在傅里叶域进行角谱拼接,将各角度相位图对应的子区域线性合成得到完整相位分布;步骤5,将拼接后的相位转换为三维形貌高度。EMD:经验模态分解;FT:傅里叶变换;IFT:逆傅里叶变换。

Fig.4使用FP-CSI对高深宽比微沟槽(宽10 um、深300 um)的形貌重建。

a1–a4沟槽上表面的干涉图。b1–b4沟槽底部表面的干涉图。c沿(b4)中标出的采样线提取的轴向干涉信号:扫描范围内的高对比条纹表明可从沟槽底部稳定提取相位,条纹对比度的局部变化提示可能存在表面粗糙或散射特征。d重建得到的三维形貌。e从(d)提取的截面轮廓。f用于验证的同一沟槽SEM图像。

Fig.5使用FP-CSI对两种多层沟槽结构的MEMS压力传感器进行形貌重建。

a1–a3传感器1在顶面、浅沟槽底部、深沟槽底部的干涉图。b1–b3传感器1代表性位置的轴向干涉信号。c传感器1的三维形貌重建。d从(c)提取的截面轮廓。e1–e3传感器2的干涉图,展示与不同沟槽层级对应的三个结构平面。f1–f3传感器2代表性位置的轴向干涉信号,对应三个结构平面。g传感器2的三维形貌重建。h从(g)提取的截面轮廓。

Fig.6 FP-CSI的横向分辨率与沟槽底部成像能力的定量评估。

a自制相位型分辨率靶标,由不同空间频率的线对组成。b1–b4裸分辨率靶标的代表性FP-CSI干涉图。c裸分辨率靶标的形貌重建。c1(c)中选定子区域(area 1)的形貌重建。c2、c3(c1)中线对(line 1、line 2)的截面轮廓。d、f通过在分辨率靶标上叠放两片本征硅片形成等效高深宽比沟槽结构,使线对位于沟槽底部。e1–e4叠片结构下的代表性FP-CSI干涉图。g1–g4使用反射式Linnik干涉仪采集到的干涉图。h1、i1 FP-CSI对沟槽底部线对的重建结果(深宽比约11:1)。h2、i2从(h1、i1)提取的截面轮廓。j反射式Linnik对宽80 um沟槽(深宽比6.25:1)的重建结果。j1–j3从(j)提取的截面轮廓。

文献来源:

Li,Y.,Yuan,Q.,Huo,X.et al.Fourier ptychographic coherence scanning interferometry for 3D morphology of high aspect ratio and composite micro-trenches.Light Sci Appl 15,93(2026).

https://doi.org/10.1038/s41377-026-02189-6

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  1. CONNECT:[ UseTime:0.000356s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000559s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000281s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000324s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000500s ]
  6. SELECT * FROM `set` [ RunTime:0.000227s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000638s ]
  8. SELECT * FROM `article` WHERE `id` = 500565 LIMIT 1 [ RunTime:0.000389s ]
  9. UPDATE `article` SET `lasttime` = 1776103052 WHERE `id` = 500565 [ RunTime:0.004546s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000325s ]
  11. SELECT * FROM `article` WHERE `id` < 500565 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000809s ]
  12. SELECT * FROM `article` WHERE `id` > 500565 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000387s ]
  13. SELECT * FROM `article` WHERE `id` < 500565 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.004348s ]
  14. SELECT * FROM `article` WHERE `id` < 500565 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001687s ]
  15. SELECT * FROM `article` WHERE `id` < 500565 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.008335s ]
0.094328s