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    Researchers developed switchable whispering-gallery mode (WGM) lasing using phase-transition hydrogels in microcavities. This innovation enables tunable laser performance and optical switching with high reversibility.

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    Area of Science:

    • Photonics and optical engineering
    • Materials science

    Background:

    • Whispering-gallery mode (WGM) lasing is crucial for photonic devices.
    • Phase-transition materials offer tunable optical properties.
    • Integrating these materials with microcavities can enhance device functionality.

    Purpose of the Study:

    • To demonstrate switchable WGM lasing using phase-transition hydrogels.
    • To explore the potential for performance customization, sensing, and optical switching.
    • To investigate the underlying physical mechanisms of the observed phenomena.

    Main Methods:

    • Incorporating a phase-transition hydrogel within a capillary microcavity.
    • Inducing and observing changes in WGM lasing characteristics near the hydrogel's phase-transition point.
    • Analyzing the effects of light scattering and refractive index changes on lasing modes.

    Main Results:

    • A sharp decrease in the number of WGM lasing modes was observed upon approaching the phase-transition point.
    • A significant blueshift in lasing wavelength accompanied the mode reduction.
    • Single-mode lasing was achieved and demonstrated superior reversibility through phase-transition manipulation.

    Conclusions:

    • Phase-transition hydrogels can effectively control WGM lasing characteristics.
    • The developed device shows promise for tunable optical switching and sensing applications.
    • This work provides a foundation for novel, multifunctional WGM lasing devices.