Abstract:
The present invention relates to a lithography apparatus and method using catadioptric exposure optics that projects high quality images without image flip. The apparatus includes means for illuminating a reticle stage to produce a patterned image. The apparatus also includes means for receiving the patterned image at each of a plurality of wafer stages. Each of the wafer stages has an associated data collection station. The apparatus also includes means for positioning the reticle stage substantially orthogonal to each of the plurality of wafer stages as well as means for directing the patterned image through a catadioptric exposure optics element between the reticle stage and each wafer stage to cause an even number of reflections of the patterned image and to project the patterned image onto each wafer stage in a congruent manner. The invention can also be combined with a dual isolation system.
Abstract:
A method and apparatus for maintaining a purged optical gap between a pellicle and a reticle in a photolithography system is described. A porous frame between a reticle and a pellicle maintains the purged optical gap. A porous frame includes a first and a second opposing surface. The first opposing surface defines a first opening, and is configured to mate with the pellicle. The second opposing surface defines a second opening, and is configured to mate with the reticle to enclose the optical gap between the pellicle and the reticle. A gas supply interface infuses a purge gas through the porous frame and into the gap.