Figure 2

Optical microscope images of fiber cross section without any coating (a), with gold film on the end face (b) and 3D viewing of Fiber 2 (c). Here, the material of Fiber 1 and 2 is NC125 and NC61.5 respectively, (a-1) and (b-1) are for Fiber 1, (a-2) and (b-2) are for Fiber 2.