Figure 2: Transition of fibre core.
From: Crystalline silicon core fibres from aluminium core preforms
(a) The optical image of a piece of fibre where a light-yellow core transits to a black core. The white dashed arrow illustrates the fibre drawing direction. (b–e) The SEM images of the cross-sections at the four labelled locations in a. (f–q) The EDX mappings of the marked area in b–e correspondingly. Green, red and yellow denote element aluminium (Al), oxygen (O) and silicon (Si), respectively.
