METHOD AND APPARATUS FOR DETERMINING A RADIATION BEAM INTENSITY PROFILE

    公开(公告)号:EP3629086A1

    公开(公告)日:2020-04-01

    申请号:EP18196626.8

    申请日:2018-09-25

    Abstract: Methods and apparatus for determining an intensity profile of a radiation beam. The method comprises providing a diffraction structure, causing relative movement of the diffraction structure relative to the radiation beam from a first position wherein the radiation beam does not irradiate the diffraction structure to a second position wherein the radiation beam irradiates the diffraction structure, measuring, with a radiation detector, diffracted radiation signals produced from diffraction of the radiation beam by the diffraction structure as the diffraction structure transitions from the first position to the second position or vice versa, and determining the intensity profile of the radiation beam based on the measured diffracted radiation signals.

    METROLOGY MEASUREMENT METHOD AND APPARATUS
    44.
    发明公开

    公开(公告)号:EP3879343A1

    公开(公告)日:2021-09-15

    申请号:EP20162286.7

    申请日:2020-03-11

    Abstract: Methods and apparatus for determining a parameter of a structure fabricated in or on a substrate and compensated for a drift error. The methods comprising: illuminating, at a plurality of times, at least part of the structure with electromagnetic radiation, the at least part of the structure being at a first orientation; sensing, at the plurality of times, a plurality of average reflectances of the at least part of the structure; illuminating, at one or more further times, the at least part of the structure with electromagnetic radiation, the at least part of the structure being at a second orientation; and sensing, one or more further average reflectances of the at least part of the structure; and determining, based on the plurality of average reflectances and the one or more further average reflectances, an estimation of the parameter at the one or more further times.

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