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Ultralow-threshold continuous-wave lasing assisted by a metallic optofluidic cavity exploiting continuous pump.

Hailang Dai, Bei Jiang, Cheng Yin

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    |February 15, 2018
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    Researchers achieved ultralow-threshold continuous-wave lasing using a novel metallic optofluidic resonant cavity. This breakthrough enables efficient lasing with low-intensity lasers, demonstrated with Rhodamine 6G and methylene blue.

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    Area of Science:

    • Optofluidics
    • Photonics
    • Materials Science

    Background:

    • Optofluidic resonant cavities are crucial for developing advanced photonic devices.
    • Achieving continuous-wave lasing with ultralow thresholds remains a significant challenge in photonics.
    • Symmetrical metal-cladding waveguides offer unique properties for light confinement and interaction.

    Purpose of the Study:

    • To demonstrate ultralow-threshold continuous-wave lasing in a metallic optofluidic resonant cavity.
    • To investigate the role of high quality factor (Q) and spontaneous emission coupling factor (β) in enhancing lasing efficiency.
    • To verify the applicability of the proposed concept using Rhodamine 6G and methylene blue as gain media.

    Main Methods:

    • Fabrication of a metallic optofluidic resonant cavity based on a symmetrical metal-cladding waveguide.
    • Utilizing ultrahigh order modes (UOMs) for enhanced interaction between the gain medium and light.
    • Pumping the cavity with a low-intensity continuous laser and measuring the lasing threshold.
    • Employing Rhodamine 6G and methylene blue as gain media to validate the concept.

    Main Results:

    • Achieved continuous-wave lasing at room temperature with an ultralow pump threshold.
    • Demonstrated effective pumping with low-intensity continuous lasers due to high Q and β factors.
    • Observed lasing emission from the chip surface when pump laser is coupled into UOMs.
    • Methylene blue exhibited lasing at a threshold as low as 2.1 μW/cm² at a concentration of 2.57*10⁻¹³ mol/ml.

    Conclusions:

    • The metallic optofluidic resonant cavity enables ultralow-threshold continuous-wave lasing.
    • The symmetrical metal-cladding waveguide design effectively enhances light-gain medium interaction via UOMs.
    • This technology holds promise for low-power photonic devices and sensors.