Regensburg 2010 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 59: Poster Session II (Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: arrays; Nanostructures at surfaces: Wires, tubes; Nanostructures at surfaces: Other; Plasmonics and nanooptics; Metal substrates: Epitaxy and growth; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsoprtion of organic / bio molecules; Metal substrates: Adsoprtion of inorganic molecules; Metal substrates: Adsoprtion of O and/or H; Metal substrates: Clean surfaces; Density functional theory and beyond for real materials)

O 59.37: Poster

Mittwoch, 24. März 2010, 17:45–20:30, Poster B1

Coupled surface plasmon polariton - exciton modes for absorbing and pumped excitons — •Stephan Schwieger, David Leipold, and Erich Runge — Institut für Physik and Institut für Mikro- und Nanotechnologien, Technische Universität Ilmenau, 98693 Ilmenau, Germany

The coupling of surface plasmon polaritons (SPPs) at metal gratings and excitons in optically excitable media can potentially be used to compensate the large SPP-losses found at metal gratings [1,2]. This coupling leads to very much increased propagation lengths and new device concepts such as SPASERS proposed by Bergman and Stockman [3]. The coupled modes are investigated theoretically for a model system that consists of a gold-nanowire array and a semiconductor quantum-well (QW) structure. Properties of the coupled modes as, e.g., their dispersion relations, their group velocities, and the coupling to propagating far-field modes are discussed. The cases of absorbing QW and optically pumped QW are compared.
P. Vasa, R. Pomraenke, S. Schwieger, Yu. I. Mazur, Vas. Kunets, P. Srinivasan, E. Johnson, J. E. Kihm, D. S. Kim, E. Runge, G. Salamo, and C. Lienau, Phys. Rev. Lett. 101, 116801 (2008).
S. Schwieger, P. Vasa, and E. Runge, Phys. Stat. Sol. (b) 245, 1071(2008).
D. J. Bergman and M. I. Stockman, Phys. Rev. Lett. 90, 027402 (2003).