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Related Experiment Video

Updated: Jun 29, 2025

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Optically pumped flexible GaN-based ultraviolet VCSELs.

Yang Mei, Peng Gu, Shuai Yang

    Optics Letters
    |April 1, 2024
    PubMed
    Summary
    This summary is machine-generated.

    Researchers developed the first flexible ultraviolet A (UVA) laser, a vertical cavity surface-emitting laser (VCSEL), using a simplified, cost-effective method. This breakthrough enables new flexible and wearable optoelectronic technologies.

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    Area of Science:

    • Optoelectronics
    • Materials Science
    • Semiconductor Physics

    Background:

    • Flexible optoelectronic platforms offer advantages in complex environments due to their mechanical adaptability.
    • Gallium Nitride (GaN)-based devices are crucial for optoelectronic applications, but achieving flexibility has been challenging.

    Purpose of the Study:

    • To demonstrate the first flexible Gallium Nitride (GaN)-based vertical cavity surface-emitting laser (VCSEL) operating in the ultraviolet A (UVA) range.
    • To develop a simplified and cost-effective method for fabricating flexible GaN-based optoelectronic devices.

    Main Methods:

    • Utilized a thin-film transfer process involving laser lift-off (LLO).
    • Employed spin-coating of photosensitive epoxy resin to create a flexible substrate.
    • Successfully transferred a 2-inch wafer-scale GaN-based membrane onto the flexible substrate.

    Main Results:

    • Achieved a flexible UVA VCSEL with a lasing wavelength of 376.5 nm.
    • Observed a narrow linewidth of 0.6 nm and a threshold energy of 98.4 nJ/pulse (13.9 mJ/cm²).
    • Demonstrated the scalability and cost-effectiveness of the fabrication method.

    Conclusions:

    • The developed flexible UVA VCSEL represents a significant advancement in optoelectronics.
    • This technology holds great promise for next-generation flexible and wearable devices.
    • The simplified fabrication process facilitates wider adoption of flexible GaN-based optoelectronics.