Understanding the near-field photoacoustic spatiotemporal profile from nanostructures.

Understanding the near-field photoacoustic spatiotemporal profile from nanostructures.
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DOI:
10.1016/j.pacs.2022.100425
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发表时间:
2022-12
期刊:
影响因子:
7.9
通讯作者:
Zhao, Yang
Zhao, Yang
中科院分区:
工程技术1区
文献类型:
--
作者:
Wang, Hanwei;Chen, Yun-Sheng;Zhao, Yang

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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.
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