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Updated: Aug 30, 2025

Large-area Scanning Probe Nanolithography Facilitated by Automated Alignment and Its Application to Substrate Fabrication for Cell Culture Studies
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Sub-nanometer misalignment sensing for lithography with structured illumination.

Nan Wang, Yi Li, Feng Sha

    Optics Letters
    |September 1, 2022
    PubMed
    Summary
    This summary is machine-generated.

    A novel structured illumination method achieves sub-nanometer misalignment sensing for advanced lithography. This breakthrough overcomes optical limits, enabling precise measurements crucial for next-generation integrated circuits and other high-precision fields.

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    Area of Science:

    • Optics and Photonics
    • Semiconductor Manufacturing
    • Metrology

    Background:

    • Next-generation integrated-circuit (IC) manufacturing at the 3nm node demands sub-nanometer misalignment measurement accuracy.
    • Existing metrology systems face limitations due to the optical diffraction limit, hindering precise measurements.

    Purpose of the Study:

    • To propose and demonstrate a novel misalignment sensing strategy overcoming current optical limitations.
    • To enable sub-nanometer accuracy in real-time for advanced lithography and precision measurement applications.

    Main Methods:

    • Development of a misalignment sensing strategy utilizing structured illumination.
    • Leveraging the modulation effect of a Talbot diffractive illuminated field on moiré fringes for signal transmission.
    • Experimental validation of the proposed sensing technique.

    Main Results:

    • Real-time-lapse misalignment sensing achieved at 100 Hz.
    • Demonstrated sub-nanometer measurement accuracy of 0.31 nm (at 3σ).
    • The method effectively bypasses optical system limitations for signal detection.

    Conclusions:

    • The proposed structured illumination method provides a viable solution for sub-nanometer misalignment sensing.
    • This technique is applicable to diverse lithography methods and advanced precision measurement fields.
    • Enables critical advancements in semiconductor manufacturing and scientific instrumentation.