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    GENERATING AN ALIGNMENT SIGNAL BASED ON LOCAL ALIGNMENT MARK DISTORTIONS
    4.
    发明公开
    GENERATING AN ALIGNMENT SIGNAL BASED ON LOCAL ALIGNMENT MARK DISTORTIONS 审中-公开

    公开(公告)号：US20230176494A1

    公开(公告)日：2023-06-08

    申请号：US17922922

    申请日：2021-04-22

    Applicant: ASML HOLDING N.V. ,  ASML NETHERLANDS B.V.

    Inventor： Zahrasadat DASTOURI ,  Igor Matheus Petronella AARTS ,  Simon Gijsbert Josephus MATHIJISSEN ,  Peter David ENGBLOM

    IPC: G03F9/00 ,  G03F7/20

    CPC classification number: G03F9/7088 ,  G03F9/7092 ,  G03F9/7049 ,  G03F7/70633

    Abstract: A method for generating an alignment signal that includes detecting local dimensional distortions of an alignment mark and generating the alignment signal based on the alignment mark. The alignment signal is weighted based on the local dimensional distortions of the alignment mark. Detecting the local dimensional distortions can include irradiating the alignment mark with radiation, the alignment mark including a geometric feature, and detecting one or more phase and/or amplitude shifts in reflected radiation from the geometric feature. The one or more phase and/or amplitude shifts correspond to the local dimensional distortions of the geometric feature. A parameter of the radiation, an alignment inspection location within the geometric feature, an alignment inspection location on a layer of a structure, and/or a radiation beam trajectory across the geometric feature may be determined based on the one or more detected phase and/or amplitude shifts.

    WAFER ALIGNMENT USING FORM BIREFRINGENCE OF TARGETS OR PRODUCT
    5.
    发明申请
    WAFER ALIGNMENT USING FORM BIREFRINGENCE OF TARGETS OR PRODUCT 有权

    公开(公告)号：US20220137523A1

    公开(公告)日：2022-05-05

    申请号：US17432019

    申请日：2020-02-06

    Applicant: ASML Holding N.V.

    Inventor： Joshua ADAMS ,  Yuxiang LIN ,  Krishanu SHOME ,  Gerrit Johannes NIJMEIJER ,  Igor Matheus Petronella AARTS

    IPC: G03F9/00

    Abstract: An alignment method includes directing an illumination beam with a first polarization state to form a diffracted beam with a second polarization state from an alignment target, and passing the diffracted beam through a polarization analyzer. The alignment method further includes measuring a polarization state of the diffracted beam and determining a location of the alignment target from the measured polarization state relative to its initial polarization state. The alignment target includes a plurality of diffraction gratings with a single pitch and two or more duty cycles, wherein the pitch is smaller than a wavelength of the illumination beam, and the location of the alignment target corresponds to the duty cycle of the diffraction grating.

    NOISE CORRECTION FOR ALIGNMENT SIGNAL
    6.
    发明申请
    NOISE CORRECTION FOR ALIGNMENT SIGNAL 有权

    公开(公告)号：US20220066334A1

    公开(公告)日：2022-03-03

    申请号：US17415711

    申请日：2019-12-12

    Applicant: ASML Holding N.V.

    Inventor： Zahrasadat DASTOURI ,  Greger Göte ANDERSSON ,  Krishanu SHOME ,  Igor Matheus Petronella AARTS

    IPC: G03F9/00

    Abstract: A method of applying a measurement correction includes determining an orthogonal subspace used to characterize the measurement as a plot of data. A first axis of the orthogonal subspace corresponds to constructive interference output from an interferometer of the metrology system plus a first error variable and a second axis of the orthogonal subspace corresponds to destructive interference output from the interferometer of the metrology system plus a second error variable. The method also includes determining a slope of the plot of data and determining a fitted line to the plot of data in the orthogonal subspace based on the slope.

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