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 59.9: Poster
Mittwoch, 24. März 2010, 17:45–20:30, Poster B1
Enhanced LED emission by ordered metallic nanoparticle arrays — •Tino Göhler1, David Gottwald1, Stefan Grafström1, Jürgen Moosburger2, and Lukas M. Eng1 — 1Institut für Angewandte Photophysik, Technische Universität Dresden, D-01062 Dresden — 2OSRAM Opto Semiconductors GmbH, D-93055 Regensburg
The external quantum efficiency of light-emitting diodes (LEDs) based on AlGaAs is limited by the total internal reflection because of the high refractive index (typically between 3 and 4) of the semiconductor. Metal nanoparticles (MNPs) can be used as dipole scatterers in order to enhance this LED emission. We investigated arrays of MNPs, produced by Fischer pattern nanolithography [1] on top of both high-index substrates and on the LED itself. Light that would otherwise remain trapped inside the substrate is coupled out by both grating coupling and resonant plasmonic scattering. Here, we present 2D and 3D calculations based on the multiple-multipole method [2] of the light output produced by an array of MNPs of different sizes and distances, and then compare these findings with our experimental results.
[1] U.Ch. Fischer and H.P. Zingsheim, J. Vac. Sci. Technol. 19 (1981) 881
[2] C. Haffner, Post-modern Electrodynamics: Using Intelligent MaXwell Solvers. Wiley, (1999)