Journal
OPTICS EXPRESS
Volume 11, Issue 25, Pages 3404-3411Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.11.003404
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The formation of localized states or modes at defects in waveguide arrays is investigated both, theoretically and experimentally. If the effective index or the coupling of the defect guide to its neighbors is varied the number and character of respective modes bound to the defect can be altered. Waveguide arrays may be considered as tailor- made or metamaterials with new and unexpected properties as e. g. guiding staggered modes bound to defects with reduced index. Although the symmetric defect waveguide becomes multimode for increased coupling it does not support antisymmetric modes. All theoretical predictions are confirmed in excellent agreement with experimental observations in polymer waveguide arrays. (C) 2003 Optical Society of America.
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