DARK FIELD DIGITAL HOLOGRAPHIC MICROSCOPE AND ASSOCIATED METROLOGY METHOD

    公开(公告)号:US20230044632A1

    公开(公告)日:2023-02-09

    申请号:US17787244

    申请日:2020-10-21

    Abstract: A dark field digital holographic microscope is disclosed which is configured to determine a characteristic of interest of a structure. The dark field digital holographic microscope comprises an illumination device configured to provide at least: a first beam pair comprising a first illumination beam of radiation (1010) and a first reference beam of radiation (1030) and a second beam pair comprising a second illumination beam of radiation (1020) and a second reference beam of radiation (1040); and one or more optical elements (1070) operable to capture a first scattered radiation and to capture a second scattered radiation scattered by the structure resultant from the first and second illumination beams respectively. The beams of the first beam pair are mutually coherent and the beams of the second beam pair are mutually coherent. The illumination device is configured to impose incoherence (ADI) between the first beam pair and second beam pair.

    OBJECT IDENTIFICATION AND COMPARISON
    5.
    发明申请

    公开(公告)号:US20200072761A1

    公开(公告)日:2020-03-05

    申请号:US16490091

    申请日:2018-03-02

    Abstract: A method including selecting a shaped feature from a set of shaped features, each shaped feature of the set of shaped features having a set of points on a perimeter of the shape of the shaped feature, creating a plurality of shape context descriptors for the selected shaped feature, wherein each shape context descriptor provides an indication of a location in a shape context descriptor framework of a first focus point of the set of points in relation to a second point of the set of points, and identifying a shaped feature from the set of shaped features having a same or similar shape as the selected shaped feature based on data from the plurality of shape context descriptors.

    METROLOGY METHOD AND DEVICE
    6.
    发明申请

    公开(公告)号:US20250138436A1

    公开(公告)日:2025-05-01

    申请号:US18690961

    申请日:2022-08-16

    Abstract: Disclosed is a metrology method and associated devices. The method comprises obtaining a first image, said first image being subject to one or more non-isoplanatic aberrations of an optical system used to capture said image; and non-iteratively correcting said first image for the effect of said one or more non-isoplanatic aberrations by performing one or both of: a field non-isoplanatic correction operation in field space for said first image, said field space corresponding to a field plane of the optical system; and a pupil non-isoplanatic correction operation in pupil space for said first image, said pupil space corresponding to a pupil plane of the optical system. Said one or more non-isoplanatic aberrations comprise a class of non-isoplanatic aberrations describable as a convolution combined with an object distortion and/or a pupil distortion.

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