Berlin 2012 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 57: Photonic Crystals II
HL 57.1: Vortrag
Mittwoch, 28. März 2012, 12:00–12:15, EW 202
Near-Field Coupling in Metamaterials — •Felix von Cube1,2, Stephan Irsen2, and Stefan Linden1,3 — 1Physikalisches Institut, Universität Bonn, 53113 Bonn, Germany — 2Research center caesar, 53175 Bonn, Germany — 3Institut für Nanotechnologie, Karlsruher Institut für Technologie (KIT), 76021 Karlsruhe, Germany
Metamaterials give rise to a variety of intriguing optical phenomena, e.g., a negative index of refraction, strong chirality and perfect lensing. The optical properties of a metamaterial can often be attributed to the excitation of localized plasmonic modes on the metallic substructures of the metamaterial. Electron energy-loss spectroscopy (EELS) in combination with scanning transmission electron microscopy (STEM) is a powerful tool to map the plasmon distributions on a nanometer scale with an energy resolution down to 0.15 eV.
Here, we investigate the near-field distributions of the interacting building blocks of a metamaterial. For these experiments, we have prepared a series of arrays in which we have successively increased the number of split-ring resonators. With STEM-EELS, we are able not only to map the optical bright modes, but also the optical dark modes. From the energy splitting of these modes, we get an indicator for the coupling strength of the metallic substructures in the metamaterial.