Coupled-resonator-induced reflection in photonic-crystal waveguide structures

Details Coupled-resonator-induced reflection in photonic-crystal waveguide structures Coupled-resonator-induced reflection in photonic-crystal waveguide structures

2008-04-25

arxiv.org/abs/0804.4140v1

Physics

Optics

LaTeX, 11 pages, 5 figures

Scientific paper

We study the resonant transmission of light in a coupled-resonator optical waveguide interacting with two nearly identical side cavities. We reveal and describe a novel effect of the coupled-resonator-induced reflection (CRIR) characterized by a very high and easily tunable quality factor of the reflection line, for the case of the inter-site coupling between the cavities and the waveguide. This effect differs sharply from the coupled-resonator-induced transparency (CRIT) -- an all-optical analogue of the electromagnetically-induced transparency -- which has recently been studied theoretically and observed experimentally for the structures based on micro-ring resonators and photonic crystal cavities. Both CRIR and CRIT effects have the same physical origin which can be attributed to the Fano-Feshbach resonances in the systems exhibiting more than one resonance. We discuss the applicability of the novel CRIR effect to the control of the slow-light propagation and low-threshold all-optical switching.

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