SPECTRAL PURITY FILTERS FOR USE IN A LITHOGRAPHIC APPARATUS.

    公开(公告)号:NL2005118A

    公开(公告)日:2011-02-22

    申请号:NL2005118

    申请日:2010-07-21

    Abstract: A spectral purity filter includes a plurality of apertures extending through a member. The apertures are arranged to suppress radiation having a first wavelength and to allow at least a portion of radiation having a second wavelength to be transmitted through the apertures. The second wavelength of radiation is shorter than the first wavelength of radiation, A first region of the spectral purity filter has a first configuration that results in a first radiation transmission profile for the radiation having the first wavelength and the radiation having the second wavelength, and a second region of the spectral purity filter has a second, different configuration that results in a second, different radiation transmission profile for the radiation having the first wavelength and the radiation having the second wavelength.

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