Systems and methods are provided for use in photolithography. In one
embodiment, a reticle is provided that comprises a phase shift and
transmission control layer, wherein a gap in the phase shift and
transmission control layer defines a line. Adjacent to the phase shift
and transmission control layer is an optically transparent material,
comprising a groove located within the line, wherein the groove comprises
a region of reduced thickness in the optically transparent material. The
region of reduced thickness serves to shift the phase of light passing
through the groove, as compared to light passing through other regions of
the optically transparent material. Thus, the reticle has a clear feature
comprising light of two different phases.