Method for position determination, method for overlay optimization, and lithographic projection apparatus
    1.
    发明授权
    Method for position determination, method for overlay optimization, and lithographic projection apparatus 失效
    位置确定方法,重叠优化方法和光刻投影仪

    公开(公告)号:US07288779B2

    公开(公告)日:2007-10-30

    申请号:US10736911

    申请日:2003-12-17

    IPC分类号: G01N21/86

    CPC分类号: G03F7/70633

    摘要: A method for optimizing an alignment condition of a lithographic projection apparatus. This method comprises projecting a beam of radiation on a target portion of a substrate and measuring a plurality of diffracted signals emitted by the target portion. This method further comprises calculating a variance for each of the plurality of diffracted signals, such that a plurality of variances of the diffracted signals is determined, and adjusting the alignment condition of the lithographic projection apparatus based on analysis of the plurality of variances.

    摘要翻译: 一种用于优化光刻投影设备的对准状​​态的方法。 该方法包括将辐射束投射在基板的目标部分上并测量由目标部分发射的多个衍射信号。 该方法还包括计算多个衍射信号中的每一个的方差,使得​​确定衍射信号的多个方差,并且基于多个方差的分析来调整光刻投影设备的对准状​​态。