Patent ID: 11972187
Assignee: D2S, INC.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 5:
6. A method for reticle enhancement technology (RET) for a lithographic imaging system, the method comprising:
representing a target wafer pattern or a predicted wafer pattern as a smooth function captured as a function sample array (FSA), wherein the FSA is an array of sampled values of the smooth function, which is a continuous differentiable function; and
providing a continuous tone mask (CTM), wherein the CTM is used to produce the predicted wafer pattern, the predicted wafer pattern spanning an entire design area;
wherein the FSA for the target wafer pattern or the predicted wafer pattern has a plurality of grid points, and the grid points are spaced at a grid pitch, wherein the grid pitch is set at a transition distance less than a lithographic imaging resolution of the lithographic imaging system.