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Multi-timescale Microscopy Methods for the Characterization of Fluorescently-labeled Microbubbles for Ultrasound-Triggered Drug Release
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Optically induced resonance of nanoparticle-loaded microbubbles.

Jacob D Dove, Mark A Borden, Todd W Murray

    Optics Letters
    |July 1, 2014
    PubMed
    Summary

    Researchers optically excited microbubble resonance using laser pulses on nanoparticles. This method precisely measured microbubble oscillations, enabling new applications in imaging and therapy.

    Area of Science:

    • Acoustics and Optics
    • Biomedical Engineering
    • Nanotechnology

    Background:

    • Microbubble oscillations are crucial for various applications.
    • Controlling microbubble dynamics optically offers novel possibilities.
    • Previous methods for driving microbubbles had limitations.

    Purpose of the Study:

    • To optically excite and detect resonant microbubble oscillations.
    • To investigate photothermal driving of microbubbles using nanoparticles.
    • To compare experimental results with theoretical models.

    Main Methods:

    • Attaching optically absorbing nanoparticles to lipid-encapsulated microbubbles.
    • Using pulsed laser light for photothermal excitation.
    • Employing light scattering with a modified optical microscope to track bubble radius.

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  • Measuring microbubble response to nanosecond laser pulses.

    • Main Results:

    • Successfully achieved optical excitation of resonant microbubble oscillations.
    • Determined the microbubble's eigenfrequency and vibrational amplitude.
    • Demonstrated good agreement between experimental data and theoretical predictions.
    • Validated the use of nanoparticles for photothermal driving.

    Conclusions:

    • Optical driving of microbubble oscillations is feasible and controllable.
    • This technique provides a precise method for studying bubble dynamics.
    • Potential applications exist in biomedical imaging and therapeutic ultrasound.