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    • 6. 发明申请
    • ILLUMINATION SYSTEM FOR AN EUV APPARATUS AND METHOD FOR RESTORING IT
    • WO2021004785A1
    • 2021-01-14
    • PCT/EP2020/067624
    • 2020-06-24
    • CARL ZEISS SMT GMBH
    • BAUMER, FlorianORTHEN, André
    • G03F7/20
    • An illumination system for an EUV apparatus is configured to receive, during operation of the EUV apparatus, EUV radiation of an EUV radiation source at a source position in an entrance plane and to shape, from at least one portion of the received EUV radiation, illumination radiation that is directed into an illumination field in an exit plane of the illumination system and in the illumination field fulfils an illumination specification. The illumination system comprises a plurality of mirror modules which are installed at assigned installation positions and which define an illumination beam path leading from the source position to the illumination field. The mirror modules comprise a first facet mirror (FAC1) and a second facet mirror (FAC2), wherein the first facet mirror (FAC1) comprises first facets (F1) configured for reflecting EUV radiation and arranged in or near a field plane of the illumination system, said field plane being optically conjugate with respect to the plane of the illumination field (BF), and the second facet mirror comprises second facets configured for reflecting EUV radiation and arranged in or near a pupil plane of the illumination system. At least one of the first facets (F1) comprises at least one alignment marking (JM) which, during use of the illumination system as intended, is not able to be imaged into the illumination field by the EUV radiation and is able to be imaged into the illumination field upon incidence of measurement light (ML) originating from a different wavelength range than the EUV radiation.
    • 8. 发明申请
    • METHOD FOR PRODUCING AN ILLUMINATION SYSTEM FOR AN EUV APPARATUS
    • WO2020069870A1
    • 2020-04-09
    • PCT/EP2019/075037
    • 2019-09-18
    • CARL ZEISS SMT GMBH
    • BAUMER, FlorianLICHTENTHÄLER, Jörg
    • G03F7/20
    • A method for producing an illumination system for an EUV apparatus comprises the following steps: installing mirror modules (FAC1, FAC2, CO) of the illumination system (ILL) at installation positions provided for the mirror modules to establish an illumination beam path which extends from a source position (SR) to an illumination field (BF) to be illuminated; coupling measurement light into the illumination beam path at an input coupling position upstream of a first mirror module (FAC1) of the illumination beam path; detecting measurement light after reflection of the measurement light at each of the mirror modules of the illumination beam path; ascertaining actual measurement values for at least one system measurement variable from detected measurement light, wherein the actual measurement values represent an actual state of the system measurement variable of the illumination system; ascertaining correction values from the actual measurement values; and adjusting at least one mirror module using the correction values to change the actual state in a manner such that in the case of irradiation with EUV radiation from the EUV radiation source, the illumination radiation in the illumination field fulfils a defined illumination specification. In this case, at least one of the mirror modules (CO) has a mirror surface to which an IR diffraction structure (DS-IR) is applied, which is designed such that at least one portion of incident radiation from the infrared range is diffracted out of the illumination beam path. Measurement light having a wavelength λ from the visible spectral range (VIS) is used, wherein the wavelength λ of the measurement light is selected in such a way that higher orders of measurement light diffracted at the IR diffraction structure (DS-IR) are substantially suppressed.
    • 9. 发明申请
    • METHOD FOR RESTORING AN ILLUMINATION SYSTEM FOR AN EUV APPARATUS, AND DETECTOR MODULE
    • WO2019081555A1
    • 2019-05-02
    • PCT/EP2018/079105
    • 2018-10-24
    • CARL ZEISS SMT GMBH
    • BAUMER, Florian
    • G03F7/20G02B27/62G01B11/00G01M11/02
    • A method for restoring an illumination system installed in an EUV apparatus, said illumination system comprising a plurality of mirror modules which are installed at assigned installation positions and which define an illumination beam path leading from the source position to the illumination field, comprises a swap operation of a mirror module, in which a mirror module is disassembled from its installed position and removed from the illumination system, a mirror module with nominally the same design is installed in the installation position in place of the removed mirror module and the installed mirror module is adjusted in rigid body degrees of freedom in the installation position while changing the relative orientation of the mirror module. Before the swap operation, a reference measurement is performed in order to capture a reference state that represents the adjustment state before the start of the swap operation. After the swap operation has finished, a comparison measurement is performed and the adjustment state measured in the process is compared to the reference state in order to restore the adjustment state from before the swap operation. The following are measured during the reference measurement and the comparison measurement: positions of a first end portion (END1) and a second end portion (END2), lying opposite the first end portion, of the illumination field (BF), with the position of the illumination field not being measured inan intermediate portion (ZW) lying between the first and the second end portion; and a spatial distribution of measurement light in a pupil plane that is Fourier-transformed in relation to the exit plane for a field point lying in the intermediate portion(ZW).