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On-demand inkjet-printed microdisk laser with air cladding by liquid flow microetching.

Taku Takagishi, Hiroaki Yoshioka, Yuya Mikami

    Applied Optics
    |August 5, 2020
    PubMed
    Summary

    A novel liquid flow microetching method precisely treats inkjet-printed microdisk lasers. This technique significantly reduces the lasing threshold, enabling advanced photonic device development.

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    Area of Science:

    • Photonics
    • Microfabrication
    • Laser Technology

    Background:

    • Inkjet printing enables microdisk fabrication but lacks precise control over etching.
    • Existing methods struggle with creating specific undercut structures for enhanced laser performance.

    Purpose of the Study:

    • To develop a novel liquid flow microetching method for precise individual treatment of inkjet-printed microdisk lasers.
    • To demonstrate the effectiveness of this method in improving microdisk laser performance.

    Main Methods:

    • Developed a liquid flow microetching technique using an injection-drain wet etching setup with microneedles.
    • Precisely controlled the etching of individual microdisks on a pre-pedestal layer.
    • Characterized the undercut structure using scanning electron microscopy and analyzed lasing properties.

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    Main Results:

    • Successfully formed fine undercut structures on inkjet-printed microdisks.
    • Achieved a twofold reduction in the measured lasing threshold compared to unetched microdisks.
    • Demonstrated excellent performance even with higher refractive index clad pre-pedestal layers.

    Conclusions:

    • The developed microetching method offers precise control for inkjet-printed microdisk lasers.
    • This technique enhances laser performance and is compatible with various substrate materials.
    • It provides a powerful tool for designing individual microdisks and developing coupled microdisk devices.