Exciton-like electromagnetic excitation in disordered lattice of coupled microresonators

International Conference and Exhibition on Mesoscopic & Condensed Matter Physics

June 22-24, 2015 Boston, USA

V V Rumyantsev, S A Fedorov and M V Sychanova

National Academy of Sciences, Ukraine

Posters-Accepted Abstracts: J Material Sci Eng

Abstract :

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, an analogous 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 micro cavities. 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 micro cavity super crystal. Our study contributes to the modeling of novel functional materials with controllable propagation of electromagnetic excitations.

Biography :

V V Rumyantsev is Professor in Nanophysics Department at Donetsk National University (DonNU) and Head of Physics Technology Subdivision at A.A. Galkin Donetsk Institute for Physics and Engineering of NASU (DonPhTI). He received PhD in Physics (1988) from DonNU and Dr. Sci. in Solid State Physics (2007) from DonPhTI. He has published more than 200 scientific publications as an Editorial Board Member of Advances in Materials (Science Publishing Group, USA) and Journal of Lasers, Optics & Photonics (OMICS Group, USA). He is Group Leader of Int. project in the framework of the European program FP7-PEOPLE-2013-IRSES (2013-2016).

Email: rumyants@teor.fti.ac.donetsk.ua