Fabrication of corrugated Ge-doped silica fibers

Wróbel P., Stefaniuk T., Antosiewicz T.J., Libura A., Nowak G., Wejrzanowski T., Andrzejczuk M., Kurzydłowski K.J., Jedrzejewski K., and Szoplik T.

Optics Express

20 (13), 2012, 14508-14513, 10.1364/OE.20.014508

We present a method of fabricating Ge-doped SiO2 fibers with corrugations around their full circumference for a desired length in the longitudinal direction. The procedure comprises three steps: hydrogenation of Ge-doped SiO2 fibers to increase photosensitivity, recording of Bragg gratings with ultraviolet light to achieve modulation of refractive index, and chemical etching. Finite-length, radially corrugated fibers may be used as couplers. Corrugated tapered fibers are used as high energy throughput probes in scanning near-field optical microscopy.