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Probing single molecule dynamics.

X S Xie, R C Dunn

    Science (New York, N.Y.)
    |July 15, 1994
    PubMed
    Summary
    This summary is machine-generated.

    Single sulforhodamine 101 molecules on glass were studied using near-field optics. Researchers observed intensity fluctuations and measured fluorescence lifetimes, revealing energy transfer dynamics and enabling advanced imaging.

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    Area of Science:

    • Spectroscopy and Optics
    • Materials Science

    Background:

    • Understanding the dynamics of single fluorescent molecules is crucial for advanced optical techniques.
    • Investigating molecular behavior at the nanoscale requires high-resolution imaging and temporal analysis.

    Purpose of the Study:

    • To investigate the room temperature dynamics of single sulforhodamine 101 molecules on a glass surface.
    • To characterize spectroscopic properties and excited-state energy transfer using near-field optics.
    • To demonstrate the potential of fluorescence lifetime imaging for single-molecule analysis.

    Main Methods:

    • Utilizing near-field optics to study single sulforhodamine 101 molecules at room temperature.
    • Analyzing intensity fluctuations via polarization measurements on a 10^-2 to 10^2 second timescale.

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  • Measuring fluorescence lifetimes on the nanosecond timescale and characterizing energy transfer to an aluminum coating.

    • Main Results:

    • Observed intensity fluctuations providing insights into spectroscopic properties of single molecules.
    • Measured fluorescence lifetimes and characterized excited-state energy transfer to the near-field probe.
    • Demonstrated time-resolved emission movie showcasing fluorescence lifetime imaging capabilities.

    Conclusions:

    • Near-field optics enables detailed investigation of single-molecule dynamics.
    • Excited-state energy transfer to the probe is a significant factor in observed dynamics.
    • Fluorescence lifetime imaging offers high sensitivity, temporal resolution, and sub-diffraction spatial resolution.