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Related Concept Videos

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Related Experiment Video

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Single-Digit Nanometer Electron-Beam Lithography with an Aberration-Corrected Scanning Transmission Electron Microscope
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Sub-diffraction optical beam lithography based on a center-non-zero depletion laser.

Chenyi Su, Chenliang Ding, Zhenyao Yang

    Optics Letters
    |December 22, 2023
    PubMed
    Summary

    This study introduces a novel center-non-zero (CNZ) depletion laser method for nanofabrication, significantly improving resolution. The new approach achieves a minimum linewidth of 30 nm, overcoming limitations of previous photoinhibition techniques.

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    Area of Science:

    • Optics and Photonics
    • Nanofabrication
    • Laser Technology

    Background:

    • Photoinhibition (PI) mechanisms enable surpassing the diffraction limit in nanofabrication.
    • Conventional donut-shaped depletion lasers in PI are limited by parasitic processes, hindering linewidth reduction below 50 nm.
    • Existing methods struggle to achieve high-resolution nanofabrication due to limitations in depletion beam strategies.

    Purpose of the Study:

    • To propose and demonstrate a novel center-non-zero (CNZ) depletion laser method for enhanced nanofabrication resolution.
    • To overcome the parasitic process limitations associated with traditional donut-shaped depletion beams.
    • To achieve sub-50 nm linewidths in laser-based nanofabrication.

    Main Methods:

    • Development of a center-non-zero (CNZ) depletion laser configuration.
    • Experimental investigation of two methods for constructing CNZ spots.
    • Maintaining constant maximum depletion intensity while reducing the zone of action.
    • Utilizing 780 nm femtosecond and 532 nm continuous-wave lasers.

    Main Results:

    • Achieved a minimum linewidth of 30 nm (λ/26), significantly surpassing previous resolutions.
    • Demonstrated effective reduction of parasitic processes through the CNZ depletion laser.
    • Validated the advantages of the CNZ method for improving writing resolution in nanofabrication.

    Conclusions:

    • The proposed CNZ depletion laser method offers a significant advancement in high-resolution nanofabrication.
    • This technique effectively minimizes parasitic processes, leading to improved writing resolution.
    • The CNZ approach provides a viable solution for breaking the diffraction limit further in laser-based nanofabrication.