Figure 1
From: Towards REPO4 nanocrystal-doped optical fibers for distributed sensing applications
Representative SEM micrographs of the core of: (a) preform #1; (b) preform #2 and (c) preform #3. The insets show an enlargement of the corresponding marked area in which the morphology and size of nanoparticles are displayed in more detail. Rod-shaped and cubic-shaped nanoparticles are marked with light blue and yellow arrows, respectively, in the preform core micrographs.
