Berlin 2005 – scientific programme

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DF: Dielektrische Festkörper

DF 6: Dielektrische und ferroelektrische dünne Schichten und Nanostrukturen II

DF 6.7: Talk

Monday, March 7, 2005, 16:00–16:20, TU TC6

Modes in circular photonic crystal cavities and local density of states — •Javad Zarbakhsh¹, Jiri Chaloupka², and Kurt Hingerl¹ — ¹Christian Doppler Labor fuer Oberflaechenoptische Methoden, Institut fuer Halbleiter und Festkoerperphysik, Universitaet Linz, A-4040 Linz, Austria — ²Department of Solid State Physics, Institute of Condensed Matter Physics, Faculty of Science, Masaryk University, Kotlarska 2, CZ-61137 Brno, Czech Republic

The penetration depth of light in the band gap is of the order of lattice constant of a photonic crystal, novel structures such as circular photonic crystals (CPC) confine light. By using the photonic local density of states (LDOS) components in a CPC, the eigenfrequencies of localized cavity modes can be efficiently found. Applying the Bloch-Floquet theorem in such a rotationally symmetric case leads to a decomposition of the Green’s tensor. Decomposed LDOS shows sharp resonance peaks which correspond to cavity modes. We demonstrate that our method can be a valuable tool to design circular photonic crystal nanodevices.