Geometrical optics in the near field: local plane-interface approach with evanescent waves

We show that geometrical models may provide useful information on light propagation in wavelength-scale structures even if evanescent fields are present. We apply a so-called local plane-wave and local plane-interface methods to study a geometry that resembles a scanning near-field microscope. We sh...

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Bibliographic Details
Published in:Optics express 2015-01, Vol.23 (1), p.330-339
Main Authors: Bose, Gaurav, Hyvärinen, Heikki J, Tervo, Jani, Turunen, Jari
Format: Article
Language:English
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Summary:We show that geometrical models may provide useful information on light propagation in wavelength-scale structures even if evanescent fields are present. We apply a so-called local plane-wave and local plane-interface methods to study a geometry that resembles a scanning near-field microscope. We show that fair agreement between the geometrical approach and rigorous electromagnetic theory can be achieved in the case where evanescent waves are required to predict any transmission through the structure.
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.23.000330