Dresden 2009 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 43: Photonic crystals I

HL 43.10: Vortrag

Donnerstag, 26. März 2009, 12:15–12:30, POT 151

Localization limits in slow light photonic crystal waveguides — •Alexander Petrov and Manfred Eich — Technische Universität Hamburg-Harburg, E-12, Eissendorfer Strasse 38, D-21073 Hamburg, Germany

The disorder in photonic crystal waveguides leads to distributed back scattering of guided modes. The backscattering intensity scales with inverse group velocity squared and leads to localization phenomena in slow light waveguides. The use of slow light components above the localization length is not possible due to the phase distortion of the signal. The reflection at a single defect is calculated with eigenmode expansion method and localization lengths are estimated as functions of group velocity in 1D and 2D photonic crystal structures. The effect of absorption and vertical scattering as well as gain on localization phenomena is discussed. It is demonstrated that absorption and vertical scattering effectively diminish localization phenomena and allow use of longer slow light components, whereas gain enhances localization and should be used carefully in slow light structures.