METROLOGY METHOD AND APPARATUS
    2.
    发明公开

    公开(公告)号:US20240184222A1

    公开(公告)日:2024-06-06

    申请号:US18443827

    申请日:2024-02-16

    CPC classification number: G03F9/7088 G03F9/7069 G03F9/7084

    Abstract: Disclosed is a method for measuring a target located on a substrate beneath at least one layer. The method comprises exciting said at least one layer with pump radiation comprising at least one pump wavelength, so as to generate an acoustic wave within said at least one layer which reflects of said target thereby generating an acoustic replica of said target at a surface of said substrate and illuminating said acoustic replica with probe radiation comprising at least one probe wavelength and capturing the resultant scattered probe radiation, scattered from the acoustic replica. One or both of said exciting step and said illuminating step comprises generating Surface Plasmon Polaritons (SPPs) on residual topography of said at least one layer resultant from said target.

    Method and Apparatus for Calculating Electromagnetic Scattering Properties of Finite Periodic Structures

    公开(公告)号:US20180011014A1

    公开(公告)日:2018-01-11

    申请号:US15644072

    申请日:2017-07-07

    CPC classification number: G01N21/4788 G01N2201/12 G03F7/705 G03F7/70625

    Abstract: A method of determining electromagnetic scattering properties of a finite periodic structure has the steps: 1002: Calculating a single-cell contrast current density, within a unit-cell supporting domain of a single one of a finite collection of unit cells. 1004: Calculating a scattered electric field outside the finite collection of unit cells, by integrating, over the single unit cell's supporting domain, a Green's function with the determined single-cell contrast current density. 1006: The Green's function is obtained for observation points outside the finite collection of unit cells by summation across the finite collection of unit cells. The Green's function integrated with the determined single-cell contrast current density is obtained for observation points above the supporting domain with respect to a substrate underlying the finite periodic structure. 1008: Determining an electromagnetic scattering property, for example a diffraction pattern, of the finite periodic structure using the calculated scattered electric field.

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