Mask for use in lithography, method of making a mask,...

Radiation imagery chemistry: process – composition – or product th – Radiation modifying product or process of making – Radiation mask

Reexamination Certificate

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Reexamination Certificate

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06927004

ABSTRACT:
A reflective mask has a sub-resolution texture applied to absorbing areas to reduce the amount of power in the specular reflection. The texture may form a phase contrast grating or may be a diffuser. The same technique may be applied to the other absorbers in a lithographic apparatus.

REFERENCES:
patent: 5296891 (1994-03-01), Vogt et al.
patent: 5501925 (1996-03-01), Smith et al.
patent: 5624773 (1997-04-01), Pforr et al.
patent: 5641593 (1997-06-01), Watanabe et al.
patent: 2001/0051304 (2001-12-01), Stivers et al.
patent: 0 757 262 (1997-02-01), None

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