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 59.38: Poster

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

Surface plasmon polaritons in a gold double-grating structure — •Steve Lenk, Stephan Schwieger, and Erich Runge — Institut für Physik und Institut für Mikro- und Nanotechnologien, Technische Universität Ilmenau, 98693 Ilmenau, Germany

We investigated theoretically the near- and the far-field distribution of a gold double-grating structure with two overlapping lattice periods. Under illumination by a plane wave, surface plasmon polaritons (SPPs) can be excited at the resonance angle and the resonance frequency. For single-grating structures, the detection signal is a mixture of directly reflected and re-radiated light from the SPPs. The double-grating structure allows the detection of the SPPs at novel angles compared to the angles of the single-grating. Thus, detection angles may be found where the SPP character dominates the signal and information on the SPP (lifetime, intensity, ...) can be obtained in the far field. For our calculation, we solved Maxwells equations in time-domain (FDTD) and frequency-domain (FEM). We compared our results with recent experimental studies.