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(Color online) (a) Tapering setup. Inset shows the tapering parameters. (b) Optical micrograph of a fiber cross section. Inset shows a magnified image of the core (scale bar is 20 μm). (c) A typical fiber taper side view. (d) Magnified side view image of the taper center (corresponding to the dotted box in (c)) showing the broken core. (e) Optical micrographs of the fiber tapers side view produced at different (v = 0.5 mm/s and mm) showing different stages of the core breakup driven by the PR capillary instability. (f) Glass viscosity μg as a function of .
(Color online) (a)–(d) SEM micrographs of the fiber core at different stages of the PR instability during static heating at 287 °C. Scale bars are all 20 μm. (e) Optical micrograph of the fiber after core breakup. (f) A single period corresponding to the dotted box in (e). In order to make the satellites visible, the fiber is squeezed between two microscope slides. (g) Magnified image of the satellites and sub-satellites corresponding to the dotted box in (f).
(Color online) (a) Dependence of the instability growth time on temperature during static heating. We calculate and plot over the same temperature range for , 10, and 11 μm. (b) Calculated instability rate () as a function of and . The black line shows the highest instability rate as a function of temperature, thus identifying xm . (c)–(e) Effect of tapering parameters on core breakup period : (c) , (d) , and (e) . Continuous curves are theoretical fits and “+” are data points. (f)–(h) Optical micrographs of glass particles with prescribed sizes obtained after dissolving the polymer cladding. Scale bars are all 10 μm. (i)–(k) SEM micrographs of single particles corresponding to (f)–(h), respectively. Scale bars are all 2 μm.
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