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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Spectroscopy

    Background:

    • Solid core photonic crystal fibers (SC-PCFs) are promising for optofluidic sensing, particularly surface-enhanced Raman spectroscopy (SERS).
    • Traditional SC-PCFs face a trade-off between light-matter interaction (evanescent field) and surface area for nanoparticle functionalization, impacting sensitivity and reliability.
    • Existing SERS platforms using planar or colloidal nanoparticles have limitations in sensitivity and integration.

    Purpose of the Study:

    • To design an innovative SC-PCF that overcomes the limitations of existing fiber-based SERS probes.
    • To enhance the surface area available for nanoparticle attachment while maintaining significant evanescent light interaction.
    • To improve the sensitivity and reliability of fiber-based sensing platforms.

    Main Methods:

    • A novel SC-PCF design was fabricated by replacing a solid silica rod with a suspended thin-silica ring.
    • The modified SC-PCF was utilized as a platform for surface-enhanced Raman spectroscopy (SERS).
    • The performance of the new design was experimentally evaluated and compared to existing PCF sensor designs.

    Main Results:

    • The silica ring SC-PCF design increased the available surface area for nanoparticle attachment by an order of magnitude.
    • A substantial evanescent light interaction with the analyte was maintained.
    • Experimental results demonstrated significantly improved sensitivity in SERS signal detection compared to previous PCF designs.

    Conclusions:

    • The novel silica ring SC-PCF design effectively resolves the trade-off between evanescent field fraction and core surface area.
    • This innovative fiber design offers enhanced sensitivity for SERS applications.
    • The design holds potential for broader applications in various fiber-based sensing technologies beyond SERS.