Stuttgart 2012 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 29: Photonik 2
Q 29.5: Vortrag
Dienstag, 13. März 2012, 15:00–15:15, V38.01
Replicating resonance behavior of plasmonic nanoparticles with simpler building blocks — •Ali Mahdavi1,2, Eugen Tatartschuk2, Oleksandr Zhuromskyy3, and Ekaterina Shamonina4 — 1Max-Planck institute for the science of light, Erlangen, Germany — 2SAOT, University of Erlangen-Nuremberg, Germany — 3IOIP, University of Erlangen-Nuremberg, Germany — 4Optical and Semiconductor Devices Group, EEE Department, Imperial College, Exhibition Road, London SW7 2BT, UK
We study by numerical simulation the resonant behavior of metallic nanoparticles, all of them having a cross section of 10*10 nm, in the region of hundreds of THz. The split ring, the most prominent subwavelength resonator, can be described as an LC circuit. However, if it is miniaturized to be as small as several hundreds of nanometers, its resonant behavior does not just simply scale with the size. The resonance frequency saturates and the field modes change significantly. The effects that need to be incorporated here are those of kinetic inductance due to the inertia of the electrons and of plasmon-polaritons at the metal/dielectric interface noticeable as the surface plasma frequency is being approached. We investigated standing wave patterns of surface plasmon polaritons on nanoparticles of different shapes, and according to our results the resonant behavior of each of these particles is similar to that of periodic arrays of nanorods with specific lengths and periodicities. For the first time the interaction of the gap edges of a split ring, previously described in terms of the self-capacitance, has been interpreted in terms of coupled plasmonic modes.