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We experimentally determine tensile force-elongation diagrams of taperedoptical fibers with a nanofiber waist. The tapered optical fibers are producedfrom standard silica optical fibers using a heat and pull process. Both, theforce-elongation data and scanning electron microscope images of the rupturepoints indicate a brittle material. Despite the small waist radii of only a fewhundred nanometers, our experimental data can be fully explained by a nonlinearstress-strain model that relies on material properties of macroscopic silicaoptical fibers. This is an important asset when it comes to designingminiaturized optical elements as one can rely on the well-founded materialcharacteristics of standard optical fibers. Based on this understanding, wedemonstrate a simple and non-destructive technique that allows us to determinethe waist radius of the tapered optical fiber. We find excellent agreement withindependent scanning electron microscope measurements of the waist radius.

Experimental stress-strain analysis of tapered silica optical fibers with nanofiber waist