Dresden 2006 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 55: Photonic crystals
HL 55.5: Vortrag
Freitag, 31. März 2006, 12:30–12:45, BEY 154
Coexistence of Left- and Righthanded Propagation in Photonic Crystals — •Ronald Meisels1, Rados Gajic1,2, Friedemar Kuchar1, Javad Zarbakhsh3, and Kurt Hingerl3 — 1Institute of Physics, University of Leoben, Austria — 2Institute of Physics, University of Belgrade, Serbia and Montenegro — 3CDL of Surface Optics, Johannes Kepler University, Linz, Austria
Photonic Crystals (PhC) are structures with a periodic spatial modulation of, e.g., the dielectric constant causing a photonic band structure. These PhC show peculiar phenomena, e.g. negative refraction (NR). For NR the directions of incident and refracted beams (parallel to vg=∂ ω / ∂ k ), when projected on the interface, are opposite. NR and positive refraction (PR) can be both accomponied by righthanded (RH) or lefthanded (LH) behavior of the wave in the PhC. In this work, the PhC consists of a square lattice of alumina rods. For this structure we present results of band structure calculations demonstrating the coexistence of a) NR and RH (1st band), b) NR and LH (2nd band), c) two waves with the same frequency and same angle of incidence showing NR with LH and RH, respectively (2nd band). These results are compared with FDTD simulations. An analysis using only field values at lattice points eliminates the periodic parts of the Bloch waves and shows only the envelopes. This allows to separate two coexisting waves as in case c).
Supported by MNA Networking Project.