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- W4308951921 abstract "Understanding the mechanism of photoacoustic generation at the nanoscale is key to developing more efficient photoacoustic devices and agents. Unlike the far-field photoacoustic effect that has been well employed in imaging, the near-field profile leads to a complex wave-tissue interaction but is understudied. Here we show that the spatiotemporal profile of the near-field photoacoustic waves can be shaped by laser pulses, anisotropy, and the spatial arrangement of nanostructure(s). Using a gold nanorod as an example, we discovered that the near-field photoacoustic amplitude in the short axis is ∼75 % stronger than the long axis, and the anisotropic spatial distribution converges to an isotropic spherical wave at ∼50 nm away from the nanorod's surface. We further extend the model to asymmetric gold nanostructures by arranging isotropic nanoparticles anisotropically with broken symmetry to achieve a precisely controlled near-field photoacoustic focus largely within an acoustic wavelength." @default.
- W4308951921 created "2022-11-20" @default.
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- W4308951921 date "2022-12-01" @default.
- W4308951921 modified "2023-10-12" @default.
- W4308951921 title "Understanding the near-field photoacoustic spatiotemporal profile from nanostructures" @default.
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- W4308951921 doi "https://doi.org/10.1016/j.pacs.2022.100425" @default.
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