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Engineering Plasmonic Nanoparticles for Enhanced Photoacoustic Imaging.

Yash Mantri, Jesse V Jokerst

    ACS Nano
    |August 19, 2020
    PubMed
    Summary

    Engineered plasmonic nanoparticles enhance photoacoustic (PA) imaging contrast. Controlling nanoparticle properties optimizes the thermoelastic expansion model for stronger PA signals, improving imaging resolution and sensitivity.

    Keywords:
    Grüneisen parameterabsorption coefficientcoatingsenhancementgold nanoparticlesphotoacoustic imagingplasmonic nanoparticlesthermoelastic expansion

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    Area of Science:

    • Biomedical Imaging
    • Nanotechnology
    • Optics and Photonics

    Background:

    • Photoacoustic (PA) imaging is an emerging technique combining optical absorption contrast with ultrasound spatial resolution.
    • Plasmonic nanoparticles, like gold nanorods and nanostars, are widely used as contrast agents in PA imaging.
    • The thermoelastic expansion model explains the PA signal generation from absorbing materials.

    Purpose of the Study:

    • To explore methods for enhancing the photoacoustic response of plasmonic nanoparticles.
    • To optimize PA contrast agent properties by tuning key variables within the thermoelastic expansion model.

    Main Methods:

    • Investigated the influence of nanoparticle geometry, composition, coatings, and surrounding solvent on PA signal generation.
    • Applied the thermoelastic expansion model, considering absorption coefficient, thermal expansion, specific heat capacity, speed of sound, and illumination fluence.
    • Focused on engineering plasmonic nanostructures for improved optical absorption and subsequent thermoelastic expansion.

    Main Results:

    • Demonstrated that controlling nanoparticle characteristics significantly impacts PA signal strength.
    • Identified key parameters (absorption, thermal expansion, etc.) that can be tuned to maximize PA signal output.
    • Showcased the versatility of the thermoelastic expansion model for predicting and optimizing PA responses.

    Conclusions:

    • Engineering plasmonic nanoparticles offers a viable strategy to enhance PA imaging contrast.
    • Tailoring nanoparticle properties based on the thermoelastic expansion model is crucial for optimizing PA signal generation.
    • This approach holds potential for advancing PA imaging sensitivity and diagnostic capabilities.