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Optofluidic microbubble Fabry-Pérot cavity.

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    Optofluidic microbubble Fabry-Pérot (OMBFP) cavities offer enhanced optical confinement and stability. This novel design achieves a significantly lower lasing threshold, enabling efficient optofluidic lasing and mode selection.

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    Area of Science:

    • Optics
    • Fluidics
    • Photonics

    Background:

    • Traditional plane-plane Fabry-Pérot (PPFP) cavities face limitations in optical mode confinement and stability.
    • Optofluidic systems offer unique advantages for manipulating light and fluids at the microscale.

    Purpose of the Study:

    • To investigate the optical properties and performance of an optofluidic microbubble Fabry-Pérot (OMBFP) cavity.
    • To compare the OMBFP cavity with traditional PPFP cavities in terms of optical confinement, stability, and lasing efficiency.

    Main Methods:

    • Systematic investigation of optical properties using the finite element method (FEM).
    • Analysis of parameters including quality (Q) factor, effective mode area, and mode distribution.
    • Experimental optofluidic lasing to determine lasing thresholds and mode selection capabilities.

    Main Results:

    • The OMBFP cavity demonstrated significantly enhanced optical mode confinement and stability compared to PPFP cavities.
    • A low lasing threshold of 1.25 µJ/mm² was achieved, an order of magnitude lower than PPFP.
    • The microbubble's dual function as a micro-lens and microfluidic channel facilitated mode selection and cell-dye laser operation.

    Conclusions:

    • The OMBFP cavity represents a significant advancement in optofluidic resonator design.
    • Improved modal confinement in OMBFP cavities leads to enhanced lasing performance and versatile functionalities.
    • This technology holds promise for advanced micro-lasers, sensors, and lab-on-a-chip devices.