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- W2802545736 abstract "We present a system that is based on a new external, polarization-insensitive differential interference contrast (DIC) module specifically adapted for detecting defects in semiconductor wafers. We obtained defect signal enhancement relative to the surrounding wafer pattern when compared with bright-field imaging. The new DIC module proposed is based on a shearing interferometer that connects externally at the output port of an optical microscope and enables imaging thin samples, such as wafer defects. This module does not require polarization optics (such as Wollaston or Nomarski prisms) and is insensitive to polarization, unlike traditional DIC techniques. In addition, it provides full control of the DIC shear and orientation, which allows obtaining a differential phase image directly on the camera (with no further digital processing) while enhancing defect detection capabilities, even if the size of the defect is smaller than the resolution limit. Our technique has the potential of future integration into semiconductor production lines." @default.
- W2802545736 created "2018-05-17" @default.
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- W2802545736 date "2018-04-27" @default.
- W2802545736 modified "2023-10-16" @default.
- W2802545736 title "Wafer defect detection by a polarization-insensitive external differential interference contrast module" @default.
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- W2802545736 doi "https://doi.org/10.1364/ao.57.003534" @default.
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