Eigen modes for the problem of anomalous light transmission through subwavelength holes

Details Eigen modes for the problem of anomalous light transmission through subwavelength holes Eigen modes for the problem of anomalous light transmission through subwavelength holes

2006-09-29

arxiv.org/abs/cond-mat/0609753v1

Physics

Condensed Matter

Materials Science

5 pages, 4 figures

Scientific paper

10.1209/0295-5075/80/24002

We show that the wide-spread concept of optical eigen modes in lossless waveguide structures, which assumes the separation on propagating and evanescent modes, fails in the case of metal-dielectric structures, including photonic crystals. In addition to these modes, there is a sequence of new eigen-states with complex values of the propagation constant and non-vanishing circulating energy flow. The whole eigen-problem ceases to be hermitian because of changing sign of the optical dielectric constant. The new anomalous modes are shown to be of prime importance for the description of the anomalous light transmission through subwavelength holes.

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