For this mean, equal parts of the two components of the adhesive epoxy were mixed and a small amount of the mixture was applied to the open end of the glass capillary to fill the gap between the glass and the W wire. The tapered capillary with the freshly applied adhesive epoxy was stored in an oven at 80 ⁰C for an hour to cure the epoxy. Then, the tip of the tapered capillary with the enclosed C fiber was examined under a microscope, and the very end of the tip, i.e., the portion where a consistent, high-quality glass sheath could not be formed around the C fiber, was removed using scissors. Finally, the tip of the C-UME was mechanically polished using a series of polishing papers (Figure ). For mechanical polishing, the C-UME was inserted into a center-hollow