Tapered fiber waist diameter as a function of pull time. Plot of fiber waist diameter vs pull time for fibers pulled using the same parameters as described in Figure
4. The red stars represent experimentally measured fiber waist diameters using an SEM, while the blue line is a fit to Eq. 1 with L as the only free parameter. This fit produces a value of L = 1.29 mm, in excellent agreement with the predetermined value of 1.30 mm using the single mode cutoff point. Inset: SEM image of tapered fiber waist at the single mode transition. The waist diameter is measured to be 1.12 μm. Scale bar is 1 μm.