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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Sub-micrometer direct laser writing using an optimized binary-amplitude zone plate lens.

Kai Xu, Jin Qin, Liang Wang

    Optics Letters
    |October 15, 2021
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel zone plate lens to enhance direct laser writing (DLW) resolution. The new method achieves sub-300 nm feature sizes, overcoming optical diffraction limits for microfabrication.

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    Area of Science:

    • Micro and Nanofabrication
    • Optical Lithography
    • Nanotechnology

    Background:

    • Direct laser writing (DLW) is a key lithography technique limited by the optical diffraction limit.
    • Existing methods to improve DLW resolution are often costly or complex.

    Purpose of the Study:

    • To develop a cost-effective and simpler method to enhance DLW resolution.
    • To achieve sub-wavelength lithography with improved depth of focus and working distance.

    Main Methods:

    • Design and fabrication of a high numerical aperture binary-amplitude-type zone plate lens.
    • Integration of the planar lens into a DLW system.
    • Experimental demonstration of lithography resolution and exposure depth.

    Main Results:

    • Achieved a sub-wavelength focal spot with a large depth of focus and long working distance.
    • Demonstrated a lithography resolution of less than 300 nm.
    • Achieved an exposure depth greater than 500 nm.

    Conclusions:

    • The integration of a planar zone plate lens significantly enhances DLW resolution.
    • This approach enables the writing of sub-micrometer structures with potential for miniaturized lithography instruments.