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Updated: Jul 20, 2025

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Advanced active polymer probe for near-field optics.

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    Researchers developed a novel active probe for scanning near-field optical microscopy (SNOM). This probe uses a fluorescent nanosphere to achieve high-resolution imaging and extract new information about nano-emitters.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Scanning near-field optical microscopy (SNOM) requires advanced probes for high-resolution imaging.
    • Existing probes often face limitations in sensitivity and stability.

    Purpose of the Study:

    • To develop and characterize a novel active probe for SNOM.
    • To investigate near-field interactions with nanoscale objects using the new probe.
    • To explore the potential of the probe for advanced nanoscale applications.

    Main Methods:

    • Grafting a fluorescent nanosphere onto a polymer tip integrated into an optical fiber.
    • Investigating near-field interactions with a gold nanocube using the active probe.
    • Analyzing polarization-dependent near-field images and fluorescence lifetime measurements.

    Main Results:

    • The spatial resolution of SNOM was determined by the size of the fluorescent nanosphere.
    • Polarization-dependent images confirmed local excitation rate enhancement.
    • Distance-dependent fluorescence lifetime measurements indicated modification of the local density of states.

    Conclusions:

    • The developed active probe offers high photostability and sensitivity for SNOM.
    • The probe enables extraction of additional information from nano-emitters.
    • Potential applications include nanoscale thermal imaging, biochemical sensing, and nanoparticle manipulation.