Coupled-resonator optical waveguides: Q-factor and disorder influence

Details Coupled-resonator optical waveguides: Q-factor and disorder influence Coupled-resonator optical waveguides: Q-factor and disorder influence

2010-11-03

arxiv.org/abs/1011.1239v1

Optical and Quantum Electronics 42, 511 (2011)

Physics

Optics

Accepted for Opt. Quant. Electron

Scientific paper

10.1007/s11082-010-9423-x

Coupled resonator optical waveguides (CROW) can significantly reduce light propagation pulse velocity due to pronounced dispersion properties. A number of interesting applications have been proposed to benefit from such slow-light propagation. Unfortunately, the inevitable presence of disorder, imperfections, and a finite Q value may heavily affect the otherwise attractive properties of CROWs. We show how finite a Q factor limits the maximum attainable group delay time; the group index is limited by Q, but equally important the feasible device length is itself also limited by damping resulting from a finite Q. Adding the additional effects of disorder to this picture, limitations become even more severe due to destructive interference phenomena, eventually in the form of Anderson localization. Simple analytical considerations demonstrate that the maximum attainable delay time in CROWs is limited by the intrinsic photon lifetime of a single resonator.

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