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Differential amplitude scanning optical microscope computer aided for linewidth measurements.

E A Bozhevolnaya, S I Bozhevolnyi, A V Postnikov

    Applied Optics
    |August 25, 2010
    PubMed
    Summary

    A new computer-aided optical microscope accurately measures submicrometer linewidths. This advanced system uses image formation theory for nanometer-level precision in critical dimension measurements.

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    Area of Science:

    • Optics
    • Metrology
    • Microscopy

    Background:

    • Accurate linewidth measurement is crucial for microelectronics fabrication.
    • Traditional microscopy methods face limitations in achieving nanometer-level accuracy for submicrometer features.

    Purpose of the Study:

    • To develop and present a computer-aided differential amplitude scanning optical microscope.
    • To demonstrate its capability for accurate linewidth measurements with high precision.

    Main Methods:

    • The system employs a differential amplitude scanning optical microscope design.
    • Experimental data treatment is based on correspondent image formation theory.
    • Measurements were performed on a three-track structure.

    Main Results:

    • The developed technique successfully measured submicrometer linewidths.
    • Nanometer accuracy was achieved in the linewidth measurements.
    • The system demonstrated reliable performance on a test structure.

    Conclusions:

    • The computer-aided differential amplitude scanning optical microscope is effective for precise linewidth metrology.
    • The technique offers a viable solution for measuring critical dimensions at the submicrometer scale.
    • This method provides nanometer accuracy essential for advanced manufacturing processes.