Braggoriton--Excitation in Photonic Crystal Infiltrated with Polarizable Medium

Details Braggoriton--Excitation in Photonic Crystal Infiltrated with Polarizable Medium Braggoriton--Excitation in Photonic Crystal Infiltrated with Polarizable Medium

2000-05-24

arxiv.org/abs/cond-mat/0005396v1

Physics

Condensed Matter

LaTeX, 8 pages, 5 figures

Scientific paper

10.1103/PhysRevA.64.013809

Light propagation in a photonic crystal infiltrated with polarizable molecules is considered. We demonstrate that the interplay between the spatial dispersion caused by Bragg diffraction and polaritonic frequency dispersion gives rise to novel propagating excitations, or braggoritons, with intragap frequencies. We derive the braggoriton dispersion relation and show that it is governed by two parameters, namely, the strength of light-matter interaction and detuning between the Bragg frequency and that of the infiltrated molecules. We also study defect-induced states when the photonic band gap is divided into two subgaps by the braggoritonic branches and find that each defect creates two intragap localized states inside each subgap.

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