Coupled-resonator-induced reflection in photonic-crystal waveguide structures
S. F. Mingaleev, A. E. Miroshnichenko, and Yu. S. Kivshar,
Opt. Express 16, 11647-11659 (2008).
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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 experimentally for the structures based on microring
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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