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Phys Rev Lett. 2000 Mar 6;84(10):2140-3.

Tight-binding description of the coupled defect modes in three-dimensional photonic crystals

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Department of Physics, Bilkent University, Bilkent, 06533 Ankara, Turkey.


We have experimentally observed the eigenmode splitting due to coupling of the evanescent defect modes in three-dimensional photonic crystals. The splitting was well explained with a theory based on the classical wave analog of the tight-binding (TB) formalism in solid state physics. The experimental results were used to extract the TB parameters. A new type of waveguiding in a photonic crystal was demonstrated experimentally. A complete transmission was achieved throughout the entire waveguiding band. We have also obtained the dispersion relation for the waveguiding band of the coupled periodic defects from the transmission-phase measurements and from the TB calculations.

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