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Related Experiment Video

Updated: Nov 12, 2025

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
12:18

Microwave Photonics Systems Based on Whispering-gallery-mode Resonators

Published on: August 5, 2013

17.3K

Electrically injected GaN-based microdisk towards an efficient whispering gallery mode laser.

Yang Mei, MinChao Xie, Huan Xu

    Optics Express
    |March 17, 2021
    PubMed
    Summary
    This summary is machine-generated.

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    Researchers developed an electrically injected Gallium Nitride (GaN) mushroom-type microdisk laser. This breakthrough overcomes previous electrical injection challenges, enabling efficient light emission and paving the way for advanced nanophotonic circuits.

    Area of Science:

    • Nanophotonics
    • Optoelectronics
    • Materials Science

    Background:

    • III-nitride mushroom-type microdisks are crucial for integrated nanophotonic circuits.
    • The air gap undercut is vital for optical confinement but hinders electrical injection.

    Purpose of the Study:

    • To demonstrate an electrically injected Gallium Nitride (GaN)-based mushroom-type microdisk.
    • To address the challenge of electrical injection in these devices.

    Main Methods:

    • Fabrication of a GaN microdisk on a copper substrate with a copper supporting pedestal for efficient current injection.
    • Characterization of optical emission, electrical properties, thermal resistance, and lasing performance.

    Main Results:

    • Achieved bright emission at ~420 nm with low leakage current (<10 nA).

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  • Demonstrated low thermal resistance (~788.86 K/W) due to the copper substrate and pedestal.
  • Observed low threshold lasing (~405 nm, ~35 nJ/pulse) under optical pumping with a high Q factor (4504).

    • Conclusions:

    • Successfully demonstrated electrical injection in a mushroom-type GaN microdisk.
    • The copper substrate and pedestal facilitate efficient current injection and thermal management.
    • This work represents a significant step towards realizing low-threshold, electrically injected microdisk lasers.