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.

    METROLOGY METHOD AND METROLOGY DEVICE
    9.
    发明公开

    公开(公告)号:US20240345489A1

    公开(公告)日:2024-10-17

    申请号:US18291534

    申请日:2022-06-08

    CPC classification number: G03F7/706851 G03F7/7065 G03F7/706849

    Abstract: Disclosed is a metrology device operable to measure a sample with measurement radiation and associated method. The metrology device comprises: an illumination branch operable to propagate measurement radiation to a sample, a detection branch operable to propagate one or more components of scattered radiation, scattered from said sample as a result of illumination of the sample by said measurement radiation; and a dispersive arrangement in either of said illumination branch or said detection branch. The dispersive arrangement is arranged to maintain one or more components of said scattered radiation at substantially a same respective location in a detection pupil plane over a range of wavelength values for said measurement radiation.

    DARK FIELD DIGITAL HOLOGRAPHIC MICROSCOPE AND ASSOCIATED METROLOGY METHOD

    公开(公告)号:US20230341813A1

    公开(公告)日:2023-10-26

    申请号:US18034356

    申请日:2021-10-07

    CPC classification number: G03H1/0443 G03H1/265 G03H2001/005

    Abstract: A dark field digital holographic microscope and associated metrology method is disclosed which is configured to determine a characteristic of interest of a structure. The dark field digital holographic microscope includes an illumination branch for providing illumination radiation to illuminate the structure; a detection arrangement for capturing object radiation resulting from diffraction of the illumination radiation by the structure; and a reference branch for providing reference radiation for interfering with the object radiation to obtain an image of an interference pattern formed by the illumination radiation and reference radiation. The reference branch has an optical element operable to vary a characteristic of the reference radiation so as to reduce and/or minimize variation in a contrast metric of the image within a field of view of the dark field digital holographic microscope at a detector plane.

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