Patent ID: 7592105

Claim:
A method of converting a reticle from a first configuration to a second configuration, comprising: providing the reticle in the first configuration, the first configuration including a quartz-containing material and a patterned layer consisting essentially of molybdenum and silicon over the quartz-containing material, the patterned layer overlapping first regions of the quartz-containing material and not overlapping second regions of the quartz-containing material, the first configuration being configured to pattern a first wavelength radiation into in-phase regions and out-of-phase regions as the first wavelength radiation passes through the first configuration; the out-of-phase regions of the first wavelength radiation being shifted by about 180° relative to the in-phase regions, and being attenuated by at least about 90% relative to the in-phase regions; and while protecting the first regions of the quartz-containing material with at least the patterned layer, etching the second regions of the quartz-containing material with a dry etch to convert the reticle to the second configuration; the second configuration being configured to pattern second wavelength radiation into in-phase regions and out-of-phase regions as the second wavelength radiation passes through the second configuration; the out-of-phase regions of the second wavelength radiation being shifted by about 180° relative to the in-phase regions, and being attenuated by less than 80% relative to the in-phase regions.