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- W2021803269 abstract "Optical proximity correction (OPC) and phase shifting mask (PSM) are resolution enhancement techniques (RET) used extensively in the semiconductor industry to improve the resolution and pattern fidelity of optical lithography. In this paper, we develop generalized gradient-based RET optimization methods to solve for the inverse lithography problem, where the search space is not constrained to a finite phase tessellation but where arbitrary search trajectories in the complex space are allowed. Subsequent mask quantization leads to efficient design of PSMs having an arbitrary number of discrete phases. In order to influence the solution patterns to have more desirable manufacturability properties, a wavelet regularization framework is introduced offering more localized flexibility than total-variation regularization methods traditionally employed in inverse problems. The proposed algorithms provide highly effective four-phase PSMs capable of generating mask patterns with arbitrary Manhattan geometries. Furthermore, a double-exposure optimization method for general inverse lithography is developed where each exposure uses an optimized two-phase mask." @default.
- W2021803269 created "2016-06-24" @default.
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- W2021803269 date "2007-03-16" @default.
- W2021803269 modified "2023-09-23" @default.
- W2021803269 title "Generalized inverse lithography methods for phase-shifting mask design" @default.
- W2021803269 doi "https://doi.org/10.1117/12.711559" @default.
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