title: Imaging three-dimensional rotational diffusion of plasmon resonant gold nanorods using polarization-sensitive optical coherence tomography.
abstract: We demonstrate depth-resolved viscosity measurements within a single object using polarized optical scattering from ensembles of freely tumbling plasmon resonant gold nanorods (GNRs) monitored with polarization-sensitive optical coherence tomography. The rotational diffusion coefficient of the GNRs is shown to correlate with viscosity in molecular fluids according to the Stokes-Einstein relation. The plasmon resonant and highly anisotropic properties of GNRs are favorable for microrheological studies of nanoscale properties.
authors: Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA.
authors: Raghav K
authors: RK
authors: Chhetri
authors: Krystian A
authors: KA
authors: Kozek
authors: Aaron C
authors: AC
authors: Johnston-Peck
authors: Joseph B
authors: JB
authors: Tracy
authors: Amy L
authors: AL
authors: Oldenburg
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