Rigorous sufficient conditions for index-guided mode in microstructured dielectric waveguides

Details Rigorous sufficient conditions for index-guided mode in microstructured dielectric waveguides Rigorous sufficient conditions for index-guided mode in microstructured dielectric waveguides

2008-03-19

arxiv.org/abs/0803.2850v1

Optics Express Vol. 16, Issue 13, pp. 9261-9275 (2008)

Physics

Optics

15 pages

Scientific paper

10.1364/OE.16.009261

We derive a sufficient condition for the existence of index-guided modes in a very general class of dielectric waveguides, including photonic-crystal fibers (arbitrary periodic claddings, such as ``holey fibers''), anisotropic materials, and waveguides with periodicity along the propagation direction. This condition provides a rigorous guarantee of cutoff-free index-guided modes in any such structure where the core is formed by increasing the index of refraction (e.g. removing a hole). It also provides a weaker guarantee of guidance in cases where the refractive index is increased ``on average'' (precisely defined). The proof is based on a simple variational method, inspired by analogous proofs of localization for two-dimensional attractive potentials in quantum mechanics.

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