Advanced Devices & Instrumentation / 2021 / Article / Fig 6

Review Article

Advanced Thermally Drawn Multimaterial Fibers: Structure-Enabled Functionalities

Figure 6

Thermally drawn fibers with nanoscale and all-directional surface patterns. Thermal drawing process of (a) a PC preform with a patterned surface and (b) a preform with patterned PC/CPE interface. (c) Reflow factor of the patterned surface PC and the patterned PC/CPE interface. The two SEM images on top show the distorted surface pattern on the fiber drawn from the PC perform, while the two SEM images at the bottom exhibit a much smaller pattern distortion on the fiber surface drawn from the PC/CPE preform. Scale bars in the top left and bottom left: 2 μm. Scale bars in the top right and bottom right: 20 μm. (d) SEM images of the hierarchical patterns on the fiber surface. Reproduced with permission. Copyright 2017, Wiley-VCH [86]. Reproduced with permission. Copyright 2019, AIP Publishing [85]. (e) Schematic of the DITD technique. (f) 2D dot array on the fiber surface. (g) Interference pattern when the fiber is illuminated by a white supercontinuum laser. (h) 300-meter long fully patterned fiber collected on a cylindrical bobbin. (i) SEM images and the corresponding local electric field spatial distributions of the round nanopatterns with different spacings on fiber surfaces. Scale bars for pattern 1: 300 nm. Scale bars for pattern 2: 150 nm. (j) Dark-field scattering spectral measurement and simulated scattering cross section of the fibers with two patterns in (i). Reproduced under the terms of the Creative Commons Attribution license (CC BY 4.0). [81].