Grazing incidence mirror, lithographic apparatus including a...

Radiant energy – Radiant energy generation and sources – With radiation modifying member

Reexamination Certificate

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C378S034000, C378S035000, C427S523000, C428S141000

Reexamination Certificate

active

10860656

ABSTRACT:
A grazing incidence mirror includes a mirror substrate and a mirror surface layer, the mirror surface layer including a first layer and a second layer, the first layer being positioned between the mirror substrate and the second layer. The first layer includes a material selected from the group of Mo, Nb and combinations thereof, and the second layer includes a material selected from the group of B, C, B4C, SiC and combinations thereof. Such a grazing incidence mirror can be used in lithographic apparatus and in device manufacturing methods and provides a reflectivity that may be larger than state of the art grazing incidence mirrors based on Ru.

REFERENCES:
patent: 5433988 (1995-07-01), Fukuda et al.
patent: 6159558 (2000-12-01), Wolfe et al.
patent: 6522716 (2003-02-01), Murakami et al.

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