Figure 4. Nanowire formation process.

(a), Synthesis at the start of the nanowire produces a slightly larger diameter until the scattered light from the nanowire is sufficient to generate stable interference. (b), SEM image showing the nanowire termination demonstrates that the larger diameter is only at the beginning of the nanowire and not at the end. (c), At the termination of a triple nanowire the side nanowires are offset from the center nanowire. All scale bars are 400 nm.