Sketch of the etching apparatus. Two lines of five stripped fibers are maintained in a first Teflon beaker filled with wax. The unit is fixed on a second Teflon beaker containing the acid. Once etching is completed, fibers are pulled up mechanically.
Sketch of the plasma reactor. The fiber is maintained in the center of the cathode by a glass capillary. (1) flow meter, (2) micrometric valve, (3) rotary pump, (4) turbomolecular pump, (5) valve, (6) current power supply, and (7) voltage power supply.
(a) Discharge characteristics; (b) electron density vs the discharge voltage.
SEM images of the typical etched fibers obtained. (a) Multimode fiber AFS 105/125Y, (b) detail of the tip of multimode fiber, and (c) single mode fiber FS-SC-6324 (d) detail of the tip of single mode fiber. Typical dimensions are diameter , taper angle for the multimode and 30° for the single mode, and length.
SEM images of fiber tips (a) before and (b) after the cleaning plasma treatment.
SEM image of the tip’s vicinity after the dry electrolytic erosion. The size of the aperture is .
Al grating: (a) Optical image with a scan range of . (b) Optical profile through three lines, showing a lateral resolution capability of NSOM, (FWHM).
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