Reflective optical element for grazing incidence in the EUV wavelength range
First Claim
Patent Images
1. An optical element, comprising:
- a substrate; and
a reflecting coating supported by the substrate,wherein;
the reflecting coating comprises a layer that comprises a metal boride;
the metal boride comprises at least one metal selected from the group consisting of molybdenum, ruthenium, niobium, zirconium, rhodium, rhenium, palladium, gold, platinum, nickel, osmium, iridium, titanium, magnesium, calcium and strontium;
the layer has a thickness of more than 50 nm; and
the reflecting coating has a reflectivity of at least 60% for EUV radiation.
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Abstract
An optical element comprises a reflecting coating on a substrate. The reflecting coating contains boron and can have a thickness of more than 50 nm.
28 Citations
30 Claims
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1. An optical element, comprising:
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a substrate; and a reflecting coating supported by the substrate, wherein; the reflecting coating comprises a layer that comprises a metal boride; the metal boride comprises at least one metal selected from the group consisting of molybdenum, ruthenium, niobium, zirconium, rhodium, rhenium, palladium, gold, platinum, nickel, osmium, iridium, titanium, magnesium, calcium and strontium; the layer has a thickness of more than 50 nm; and the reflecting coating has a reflectivity of at least 60% for EUV radiation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An optical system, comprising:
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an optical element, comprising; a substrate; and a reflecting coating supported by the substrate, wherein; the reflecting coating comprises a layer that comprises a metal boride; the metal boride comprises at least one metal selected from the group consisting of molybdenum, ruthenium, niobium, zirconium, rhodium, rhenium, palladium, gold, platinum, nickel, osmium, iridium, titanium, magnesium, calcium and strontium; the layer has a thickness of more than 50 nm; the reflecting coating has a reflectivity of at least 60% for EUV radiation; and the optical system is an EUV lithography optical system. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A device, comprising:
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an illumination system; and a projection objective, wherein; the device comprises an optical element; the optical element comprises a substrate and a reflecting coating supported by the substrate; the reflecting coating comprises a layer that comprises a metal boride; the metal boride comprises at least one metal selected from the group consisting of molybdenum, ruthenium, niobium, zirconium, rhodium, rhenium, palladium, gold, platinum, nickel, osmium, iridium, titanium, magnesium, calcium and strontium; the layer has a thickness of more than 50 nm; the reflecting coating has a reflectivity of at least 60% for EUV radiation; and the device is an EUV lithography device. - View Dependent Claims (24, 25, 26, 27)
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28. An optical element, comprising:
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a substrate; and a reflecting coating supported by the substrate, wherein; only one layer of the reflecting coating comprises a mixed metal boride; the mixed metal boride comprises at least one metal selected from the group consisting of molybdenum, ruthenium, niobium, zirconium, rhodium, rhenium, palladium, gold, platinum, nickel, osmium, iridium, titanium, magnesium, calcium and strontium; the only one layer of the reflecting coating that comprises the mixed metal boride has a thickness of more than 50 nm; and the reflecting coating has a reflectivity of at least 60% for EUV radiation. - View Dependent Claims (29, 30)
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Specification