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. 2020 Jan 21;15:401–418. doi: 10.2147/IJN.S201208

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© 2020 Tian et al.

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(A) Schematic illustration showing the process of photoacoustic imaging (PAI). Adapted from Wang S, Lin J, Wang T, Chen X, Huang P. Recent Advances in Photoacoustic Imaging for Deep-Tissue Biomedical Applications. Theranostics. 2016;6(13):2394–2413. © 2016 Ivyspring International Publisher (https://creativecommons.org/licenses/by-nc/4.0/legalcode).⁴⁸ (B) Schematic illustration of (a) surface plasmons and (b) a localized surface plasmon. Adapted with permission from Mayer KM, Hafner JH. Localized surface plasmon resonance sensors. Chemical Reviews. 2011;111(6):3828–3857. Copyright © 2011 American Chemical Society.⁵⁰