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In-fiber fluorospectroscopy based on a spectral decomposition method.

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    A simplified model accurately predicts light-fluorescence interactions in photonic crystal fibers (PCFs). This method eliminates optical filters and intensity fluctuations for reliable dye concentration measurements.

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    Area of Science:

    • Photonics
    • Optical Engineering
    • Biomedical Optics

    Background:

    • Photonic crystal fibers (PCFs) offer unique light-guiding properties.
    • Accurate modeling of light-fluorescence interactions is crucial for sensing applications.
    • Existing models can be complex and require optical filters.

    Purpose of the Study:

    • To develop a simplified computational model for light-fluorescence interactions in PCFs.
    • To establish a ratiometric measurement method independent of optical filters and intensity fluctuations.
    • To validate the model against experimental data.

    Main Methods:

    • Plotting ray trajectories within a simplified PCF core, considering total internal reflection.
    • Calculating absorption and fluorescence emission at reflection points for launched rays.
    • Averaging computed values and deriving a dimensionless ratiometric relationship for dye concentrations.

    Main Results:

    • The model successfully computed light-fluorescence interactions for varying dye concentrations.
    • A dimensionless ratiometric relationship was established, eliminating the need for optical filters.
    • Modeled results showed good agreement with experimental data from two different PCFs.

    Conclusions:

    • The simplified model provides an efficient and accurate method for analyzing fluorescence in PCFs.
    • This approach minimizes experimental complexities and enhances measurement reliability.
    • The model has potential applications in fluorescence-based sensing and imaging.