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Autori: S. G. Johnson, M. Ibanescu, M. Skorobogatiy, O. Weisberg, T. D. Engeness, M. Soljacic, S. A. Jacobs, J. D. Joannopoulos, Y. Fink
Editorial: Optics Express, 9, p.748 - 779, 2001.
We present the light-propagation characteristics of OmniGuide fibers, which
guide light by concentric multi-layer dielectric mirrors having the property of
omnidirectional reflection. We show how the lowest-loss TE_01 mode can
propagate in a single-mode fashion through even large-core fibers, with other
modes eliminated asymptotically by their higher losses and poor coupling,
analogous to hollow metallic microwave waveguides. Dispersion, radiation
leakage, material absorption, nonlinearities, bending, acircularity, and interface
roughness are considered with the help of leaky modes and perturbation theory,
and both numerical results and general scaling relations are presented. We show
that cladding properties such as absorption and nonlinearity are suppressed by
many orders of magnitude due to the strong confinement in a hollow core, and
other imperfections are tolerable, promising that the properties of silica fibers may
be surpassed even when nominally poor materials are employed.
Cuvinte cheie: fibra optica, cristale fotonice // fiber optics, photonic crystals