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. Author manuscript; available in PMC: 2018 Apr 5.
Published in final edited form as: ACS Nano. 2016 Oct 13;10(10):9626–9636. doi: 10.1021/acsnano.6b05127

Figure 2.

Figure 2

(a) Topography of the N = 3 and 4 regions of the sample. Inset: Linecuts along the blue and black lines. (b) Topography of the N = 12 region. (c, d) SHG images of the regions shown in (a) and (b), respectively. The crystal and step edges are shown as solid and dashed lines, respectively. Color contrast is scaled by ×2 in (d). (e, f) SHG polar maps with the polarizer and analyzer parallel (black) and crossed (red) acquired at the black square (N = 4) in (c) white circle (N = 12) in (d), respectively. The angle is relative to the initial polarization (white double arrow in c and d) and in the direction defined in Figure 1c. Scale bar = 2 μm.