Figure 5. Identification of 2D or 3D geometry and orientation of two different AuNS rotating at a glass-water interface.
(a) Non-lobed image patterns indicate a 2D structure. (b) Quantified contrast was used to track orientation of the 2D AuNS. (c) Lobed image patterns indicate a 3D geometry. (d) Quantified contrast was used to track orientation of the 3D AuNS. The regions highlighted in yellow correspond to the 21 consecutive frames shown in (a) and (c). The red and blue boxes indicate the frames with brightest and darkest contrast that correspond to alignment with the polarization of the extraordinary and ordinary beams, respectively.