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Tapered fiber and optrode. (a) A pulled fiber after connecting to a ferrule and polishing of the ceramic end. The inset zooms in the tapered end, which also shows the fiber with and without coating. (b) The tip of the optrode under high-resolution microscope, which shows the relative position of the tapered fiber and the tungsten electrode. (c) Illumination of light scattering from the fiber tip.
