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- W1977182455 abstract "Mask topography contributes diffraction-induced phase near edges, affecting the through-focus intensity variation and hence the process window at the wafer. We analyze the impact of edge diffraction on projection printing directly with experiments on an aerial image measurement system (AIMS). We show here that topographic effects change with illumination angle and can be quantified using through-focus intensity measurements. Off- axis incidence influences not just defocus image behavior (as for normal incidence), but also the at-focus intensity at wafer. Moreover, with oblique illumination, mask diffraction varies for left-facing and right-facing sidewalls, the nature of the asymmetry being polarization dependent. The image degradation due the polarization parallel to the sidewall (TE) is seen to be stronger, owing to the interplay of mask topography and pupil filtering in the imaging system. This translates to a CD variation of 2% between the two polarizations, even at focus. A simple thin-mask boundary layer model that treats each sidewall independently is shown to be able to approximate mask topography induced diffraction for both polarizations with 5-10nm wide boundary layers." @default.
- W1977182455 created "2016-06-24" @default.
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- W1977182455 date "2015-03-26" @default.
- W1977182455 modified "2023-09-23" @default.
- W1977182455 title "Characterizing the dependence of thick-mask edge effects on illumination angle using AIMS images" @default.
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- W1977182455 doi "https://doi.org/10.1117/12.2087615" @default.
- W1977182455 hasPublicationYear "2015" @default.
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