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). https://creativecommons.org/licenses/by/4.0/ [81].