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Waveguide-integrated microdisk lasers via ink-jet printing.

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    Researchers developed a novel method for integrating low-cost lasers into photonic integrated circuits using ink-jet-printed microdisk resonators. This technique enables customizable datacom and sensory systems for diverse applications.

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    Area of Science:

    • Photonics and Materials Science
    • Optoelectronics and Integrated Photonics

    Background:

    • Photonic integrated circuits (PICs) offer versatile solutions for data communication and sensing.
    • Integrating light sources, especially lasers, into PICs is a significant technical and economic hurdle.

    Purpose of the Study:

    • To demonstrate a cost-effective method for coupling ink-jet-printed microdisk lasers to vertically stacked PICs.
    • To enable novel functionalities and reconfigurable circuits on a compact chip platform.

    Main Methods:

    • Ink-jet printing of dye-doped microdisk laser resonators with a low lasing threshold (< 100 µJ/mm²).
    • Vertical coupling of whispering gallery modes from wedge-shaped resonators to silicon nitride waveguides.
    • Precise alignment in both height and lateral dimensions for efficient mode transfer.

    Main Results:

    • Successful integration of ink-jet-printed microdisk lasers into a PIC.
    • Demonstration of efficient vertical coupling between resonators and waveguides.
    • Achieved low lasing thresholds suitable for practical applications.

    Conclusions:

    • Ink-jet printing offers a flexible and scalable approach for fabricating microdisk lasers for PICs.
    • This method facilitates the development of low-cost, reconfigurable photonic integrated circuits.
    • The technology holds promise for diverse applications in datacom, chemical sensing, and biological sensing.