Theory of disorder-induced multiple coherent scattering in photonic crystal waveguides

Details Theory of disorder-induced multiple coherent scattering in photonic crystal waveguides Theory of disorder-induced multiple coherent scattering in photonic crystal waveguides

2010-02-22

arxiv.org/abs/1002.4208v1

2010 J. Opt. 12 104013 (Special Issue on Slow Light): http://iopscience.iop.org/2040-8986/12/10/104013

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

We introduce a theoretical formalism to describe disorder-induced extrinsic scattering in slow-light photonic crystal waveguides. This work details and extends the optical scattering theory used in a recent \emph{Physical Review Letter} [M. Patterson \emph{et al.}, \emph{Phys. Rev. Lett.} \textbf{102}, 103901 (2009)] to describe coherent scattering phenomena and successfully explain complex experimental measurements. Our presented theory, that combines Green function and coupled mode methods, allows one to self-consistently account for arbitrary multiple scattering for the propagating electric field and recover experimental features such as resonances near the band edge. The technique is fully three-dimensional and can calculate the effects of disorder on the propagating field over thousands of unit cells. As an application of this theory, we explore various sample lengths and disordered instances, and demonstrate the profound effect of multiple scattering in the waveguide transmission. The spectra yield rich features associated with disorder-induced localization and multiple scattering, which are shown to be exasperated in the slow light propagation regime.

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