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    • 4. 发明申请
    • LITHOGRAPHY ALIGNMENT SYSTEM AND METHOD USING nDSE-BASED FEEDBACK CONTROL
    • LITHOGRAPHY对准系统和使用基于nDSE的反馈控制的方法
    • US20080090312A1
    • 2008-04-17
    • US11550372
    • 2006-10-17
    • Inkyu ParkWei WuJun GaoCarl E. Picciotto
    • Inkyu ParkWei WuJun GaoCarl E. Picciotto
    • H01L21/66
    • G03F9/7038G03F9/7088G03F9/7092G03F9/7096
    • A contact lithography alignment system and method use nanoscale displacement sensing and estimation (nDSE) to maintain an alignment and compensate for a disturbance of one or more objects during contact lithography. A method of maintaining an alignment includes establishing an initial alignment of one or more objects and employing nDSE-based feedback control of relative positions of more or more of the objects to maintain the alignment during contact lithography. A method of disturbance compensation includes acquiring a first image, acquiring a second image, estimating an alignment error using nDSE applied to the first and second image, and adjusting a relative position to reduce the alignment error. A contact lithography system includes an optical sensor, a feedback processor providing nDSE and a position controller that adjusts relative positions of one or more objects to reduce an alignment error determined using the nDSE.
    • 接触光刻对准系统和方法使用纳米尺度位移感测和估计(nDSE)来保持对准并补偿接触光刻期间一个或多个物体的干扰。 保持对准的方法包括建立一个或多个对象的初始对准,并且采用基于nDSE的多个对象的相对位置的反馈控制来保持接触光刻期间的对准。 干扰补偿的方法包括获取第一图像,获取第二图像,使用施加到第一和第二图像的nDSE来估计对准误差,以及调整相对位置以减小对准误差。 接触光刻系统包括光学传感器,提供nDSE的反馈处理器和调整一个或多个对象的相对位置以减少使用nDSE确定的对准误差的位置控制器。
    • 7. 发明授权
    • Multiple layer alignment sensing
    • 多层对齐检测
    • US07650029B2
    • 2010-01-19
    • US10995840
    • 2004-11-23
    • Carl E. PicciottoJun Gao
    • Carl E. PicciottoJun Gao
    • G06K9/00
    • G03F9/7003G03F9/7038G03F9/7088
    • Using an imaging system in relation to a plurality of material layers is described, the material layers being separated by a distance greater than a depth of field of the imaging system. A focal plane of the imaging system and a first of the plurality of material layers are brought into correspondence. A first image including at least a portion of the first material layer having a first feature of interest thereon is stored. The focal plane of the imaging system and a second of the plurality of material layers are brought into correspondence. A second image including at least a portion of the second material layer having a second feature of interest thereon is acquired. The first and second images are processed for automatic computation of an alignment measurement between the first and second features of interest.
    • 描述了相对于多个材料层使用成像系统,材料层被分离大于成像系统的景深的距离。 使成像系统的焦平面和多个材料层中的第一个成对准。 存储包括其上具有感兴趣的第一特征的第一材料层的至少一部分的第一图像。 使成像系统的焦平面和多个材料层中的第二个成对应。 获取包括具有第二特征的第二材料层的至少一部分的第二图像。 处理第一和第二图像以自动计算感兴趣的第一和第二特征之间的对准测量。
    • 8. 发明授权
    • Displacement estimation system and method
    • 位移估计系统和方法
    • US07085673B2
    • 2006-08-01
    • US10930614
    • 2004-08-31
    • Carl E. PicciottoJun GaoWei Wu
    • Carl E. PicciottoJun GaoWei Wu
    • G01B21/02G06K9/32
    • G06T7/20G06T7/70
    • A displacement estimation system including a data acquisition system and a processing system is provided. The data acquisition system is configured to capture a first frame from a first substrate including a first pattern and a second substrate including a second pattern at a first time and capture a second frame from a third substrate including a third pattern and a fourth substrate including a fourth pattern at a second time subsequent to the first time. The first pattern and the third pattern are substantially identical, and the second pattern and the fourth pattern are substantially identical. The processing system is configured to calculate a first displacement between the first pattern and the third pattern using the first frame and the second frame and calculate a second displacement between the second pattern and the fourth pattern using the first frame and the second frame.
    • 提供了包括数据采集系统和处理系统的位移估计系统。 数据采集​​系统被配置为在第一时间从包括第一图案的第一基板和包括第二图案的第二基板捕获第一帧,并从包括第三图案的第三基板和包括第三图案的第四基板捕获第二帧 第四模式在第一次之后的第二时间。 第一图案和第三图案基本相同,第二图案和第四图案基本相同。 处理系统被配置为使用第一帧和第二帧来计算第一图案和第三图案之间的第一位移,并且使用第一帧和第二帧计算第二图案和第四图案之间的第二位移。
    • 10. 发明授权
    • Displacement measurements using phase changes
    • 使用相位变化进行位移测量
    • US07609858B2
    • 2009-10-27
    • US10931414
    • 2004-08-31
    • Jun GaoCarl E. Picciotto
    • Jun GaoCarl E. Picciotto
    • G06K9/00
    • G01B11/002G06T7/262G06T7/37
    • A measurement process or system transforms image data corresponding to images of an object to the frequency domain and analyzes the frequency domain data to determine a displacement of the object occurring between first and second images. Analysis in the frequency domain simplifies identification and handling of data expected to be noisy. In particular, frequencies corresponding to modes of vibration, lighting variation, or sensor error characteristic of a measurement system or frequencies corresponding to small magnitude frequency-domain data can be given little or no weighting in analysis that provides the displacement measurement. In one embodiment, Fourier transforms of shifted and unshifted images differ by a phase delay. A least square fit slope of the phase values associated with the phase delay can indicate displacements to accuracies less than 1% of a pixel width, thereby providing nanometer scale precision using imaging systems having a pixel width of about 1 μm.
    • 测量过程或系统将对应于对象的图像的图像数据变换到频域,并分析频域数据以确定在第一和第二图像之间发生的对象的位移。 频域分析简化了预计嘈杂的数据的识别和处理。 特别地,对应于测量系统的振动模式,照明变化或传感器误差特性的频率或与小幅度频域数据相对应的频率的频率,在提供位移测量的分析中可以很少或没有加权。 在一个实施例中,移位和未移位图像的傅里叶变换相位延迟。 与相位延迟相关的相位值的最小平方拟合斜率可以指示小于像素宽度的1%的精度位移,从而使用具有约1um的像素宽度的成像系统提供纳米级精度。