Influence of Geometric Disorder on the Band Structure of a Photonic Crystal

I. Ponomarev 1, M. Bayer2, and T. Reinecke1
1Naval Research Laboratory, Washington, DC, USA
2Universit├Ąt Dortmund, Dortmund, Germany

The influence of disorder on the optical mode spectrum of chains of coupled micron-sized microcavities has been studied both experimentally and theoretically with the help of COMSOL.

The disorder is introduced by systematic variation of cavity sizes. The resulting spectra are interpreted in terms of modified dispersion for propagation along the chains accompanied by the appearance of localized impurity-like photonic states. We interpret the modes for this kind of disorder in terms of impurity bands for each of the cavity sizes.