Abstract
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.
Highlights
In the past decade, nanotechnological means to fabricate structures smaller than the wavelength of light have been growing and addressing various applications
We present a method of fabricating Ge-doped SiO2 fibers with corrugations around their full circumference for a desired length in the longitudinal direction
Finite-length, radially corrugated fibers may be used as couplers
Summary
Nanotechnological means to fabricate structures smaller than the wavelength of light have been growing and addressing various applications. The common point of almost all of them is connected with concentration of light signal due to transformation of waves propagating in uniform media to surface plasmon-polariton (SPP) ones at metal-dielectric interfaces. This transformation leads to miniaturization of information channels. Light concentrators have different forms from tapered fibers [1], either all-dielectric with a large core-cladding index contrast or metal coated ones [2], through tapered plasmonic waveguides with photon-plasmon couplers [3,4] ending at metamaterial nanotips [5]. In fiber laser applications tapered fibers with distributed Bragg reflectors (DBRs) are used for dispersion compensation [7]. The fiber is etched in an aqueous solution of HF acid to obtain equidistant circular grooves at the core surface
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