Journal of Physical Chemistry & Biophysics
Open Access

Dispersion peculiarities of exciton-like electromagnetic excitation in disordered lattice of coupled microresonators

International Conference and Trade fair on Laser Technology

July 20-22, 2015 Orlando, Florida, USA

V V Rumyantsev, S A Fedorov and M V Sychanova

Posters-Accepted Abstracts: J Phys Chem Biophys

Abstract :

Photonic structures and metamaterials are in the focus of theoretical and experimental interdisciplinary studies, which span laser physics, condensed matter physics, nanotechnology, chemistry and information science. The physics of photonic super crystals is in many ways similar to the physics of crystalline solids. Due to imperfections of the super crystal lattice photonic gaps may contain impurity states, which are of crucial importance in realistic photonic structures. While the theory of impurity bands and excitons in semiconductor crystals has been developed in 1970-1980s, a similar theory for photonic crystals is yet to be constructed. In this work we carry out a theoretical study of exciton-like electromagnetic excitations in disordered photonic super crystals composed by coupled microcavities. Here we study dispersions of localized electromagnetic excitations in an array of coupled microcavities which form a non-ideal super crystal rich by point-like defects. We study the propagation peculiarities of these excitations in a two-dimensional non-ideal binary micro-cavity lattice with the use of the virtual crystal approximation. The effect of point defects (vacancies) on the excitation spectrum is being numerically modeled. The adopted approach permits to obtain the dispersion law and the energy gap width of the considered quasiparticles and to analyze the dependence of their density of states on defect concentrations in a microcavity super crystal. Our study contributes to the modeling of novel functional materials with the controllable propagation of electromagnetic excitations.