Optical surface edge Bloch modes: low-loss subwavelength-scale two-dimensional light localization
Abstract
Edge modes of a finite-size woodpile can appear within a complete bandgap on an <010> edge. The mode area is as small as 0.066 squared half-in-vacuum-wavelengths, and the propagation loss is small. The field maxima occur at a dielectric-vacuum interface, like at a metal-dielectric interface for surface plasmon modes. The edge mode is a subwavelength-scale 2D light localization mode in non-metallic materials. Analysis of two-mode co-directional coupling between identical surface Bloch modes suggests that a large photonic crystal or surface designing would be needed for suppressing the evanescent field coupling in the woodpile.
- Publication:
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Optics Letters
- Pub Date:
- November 2012
- DOI:
- 10.1364/OL.37.004398
- arXiv:
- arXiv:1206.4342
- Bibcode:
- 2012OptL...37.4398S
- Keywords:
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- Physics - Optics
- E-Print:
- doi:10.1364/OL.37.004398