Authors: (J. Canning, Interdisiplinary Photonics Laboratories, School of Chemistry, University of Sydney)
Abstract: Recent developments in optical fibre allow for the first time control of the far-field properties of light which exit an optical fibre. They also offer a route to controlling and manipulating light in the near field within the optical fibre in ways that are analogous to Fresnel lenses and optics. The description centred on the virtual zones of waveguides suggests a fundamental analogy with diffraction-free beams in free space and novel new approaches to completely unique waveguide designs. Of those recently proposed and studies, are fractal zones which have revealed the possibility of engineering very simple fibre designs with zero bend loss. As well as the demonstration of self-aligned lenses on fibre tips, other demonstrably novel applications include new fibre tips for scanning near field microscopy (SNOM) that do not require metal coatings.
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