1. Probing biological nanotopology via diffusion of weakly constrained plasmonic nanorods with optical coherence tomography

    Probing biological nanotopology via diffusion of weakly constrained plasmonic nanorods with optical coherence tomography

    Biological materials exhibit complex nanotopology , i.e., a composite liquid and solid phase structure that is heterogeneous on the nanoscale. The diffusion of nanoparticles in nanotopological environments can elucidate biophysical changes associated with pathogenesis and disease progression. However, there is a lack of methods that characterize nanoprobe diffusion and translate easily to in vivo studies. Here, we demonstrate a method based on optical coherence tomography (OCT) to depth-resolve diffusion of plasmon-resonant gold nanorods (GNRs) that are weakly constrained by the biological tissue. By using GNRs that are on the size scale of the polymeric mesh, their Brownian motion is minimally ...

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