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Opt Express. 2010 Jan 18;18(2):1762-76. doi: 10.1364/OE.18.001762.

Band splitting and modal dispersion induced by symmetry braking in coupled-resonator slowlight waveguide structures.

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Department of Electrical Engineering, Tel Aviv University, Tel Aviv, Israel.


We study the dispersion relations in slow-light waveguide structures consisting of coupled microdisk resonators. A group theoretical analysis of the symmetry properties of the propagating modes reveals a fundamental phenomenon: The degeneracy of the CW and CCW rotating modes is removed, giving rise to two distinct transmission bands. This effect induces symmetry-based dispersion which may limit the usable bandwidth of such structures. The properties of this band splitting and its impact on CROW performance for optical communications are studied in detail.

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