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Related Experiment Video

Updated: Mar 30, 2026

Laser-induced Forward Transfer for Flip-chip Packaging of Single Dies
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Spatially modulated laser pulses for printing electronics.

Raymond C Y Auyeung, Heungsoo Kim, Scott Mathews

    Applied Optics
    |November 13, 2015
    PubMed
    Summary
    This summary is machine-generated.

    Digital micromirror device (DMD) enhanced laser-induced forward transfer (LIFT) enables rapid, reconfigurable printing. This technique precisely transfers high-viscosity inks, creating highly congruent features with reduced laser energy for complex patterns.

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    Area of Science:

    • Materials Science
    • Additive Manufacturing
    • Optics

    Background:

    • Laser-induced forward transfer (LIFT) is a direct-write additive manufacturing technique.
    • High-viscosity inks present challenges for precise feature transfer in LIFT.
    • Controlling laser beam spatial profile is crucial for feature resolution and transfer efficiency.

    Purpose of the Study:

    • To review the integration of digital micromirror devices (DMD) with LIFT.
    • To investigate the use of DMD for parallel, reconfigurable direct-write capabilities.
    • To explore methods for reducing laser transfer threshold fluence and printing complex patterns.

    Main Methods:

    • Utilizing a digital micromirror device (DMD) to control the laser beam spatial profile in LIFT.
    • Employing high-viscosity donor ink, specifically silver nanopaste.
    • Adapting half-toning techniques to DMD bitmap images for edge-enhanced beam profiles.
    • Investigating the laser transfer threshold fluence for microscale features.

    Main Results:

    • DMD-integrated LIFT produces laser-printed features congruent to the laser beam profile.
    • The technique enables highly parallel and rapidly reconfigurable direct-write printing.
    • Half-toning and edge-enhanced beam profiles reduce the laser transfer threshold fluence for 10 μm features.
    • Complex large-area patterns can be printed with a single laser pulse.

    Conclusions:

    • DMD integration transforms LIFT into a versatile, high-throughput direct-write technology.
    • Edge-enhanced beam shaping via DMD significantly improves LIFT efficiency and pattern complexity.
    • This approach offers a pathway for advanced microfabrication using high-viscosity materials.