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Flexible GaN-based ultraviolet microdisk lasers on PET substrate.

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    Researchers developed a flexible Gallium Nitride (GaN)-based microdisk laser on a polyethylene terephthalate (PET) substrate for ultraviolet A (UVA) applications. This novel flexible laser shows potential for mechanical sensing due to its tunable wavelength under bending.

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    Area of Science:

    • Optoelectronics
    • Materials Science
    • Nanotechnology

    Background:

    • Flexible optoelectronics offers advantages over conventional devices due to enhanced mechanical flexibility for diverse working environments.
    • Gallium Nitride (GaN)-based devices are crucial for optoelectronic applications, particularly in the ultraviolet (UV) spectrum.
    • Microdisk lasers provide efficient light confinement and emission, but fabrication on flexible substrates remains challenging.

    Purpose of the Study:

    • To demonstrate, for the first time, a flexible GaN-based microdisk laser operating in the ultraviolet A (UVA) range.
    • To investigate the performance characteristics of the flexible microdisk laser, including lasing wavelength, linewidth, and threshold power.
    • To explore the potential of the flexible laser for sensing applications by analyzing its response to mechanical strain.

    Main Methods:

    • Fabrication of a GaN-based microdisk laser on a flexible polyethylene terephthalate (PET) substrate using a thin-film transfer process.
    • Employing laser lift-off (LLO) technique for efficient material transfer and device integration.
    • Deposition of a distributed Bragg reflector (DBR) as a bottom mirror to enhance optical confinement and oscillation intensity.

    Main Results:

    • Successful demonstration of a flexible GaN-based microdisk laser emitting at 370.5 nm with a narrow linewidth of 0.15 nm.
    • Achieved a threshold power density of 200 kW/cm², indicating efficient lasing performance.
    • Observed a 2-nm redshift in the lasing wavelength under varying bending curvatures, confirming its sensitivity to mechanical strain.

    Conclusions:

    • The developed flexible GaN-based microdisk laser represents a significant advancement in flexible optoelectronics.
    • The device's sensitivity to mechanical bending opens avenues for novel applications in flexible mechanical sensing.
    • This work paves the way for future development of robust and adaptable optoelectronic devices for complex environments.