Dresden 2011 – scientific programme

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DS: Fachverband Dünne Schichten

DS 42: Poster I: Progress in Micro- and Nanopatterning: Techniques and Applications (jointly with O); Spins in Organic Materials; Ion Interactions with Nano Scale Materials; Organic Electronics and Photovoltaics; Plasmonics and Nanophotonics (jointly with HL and O); High-k and Low-k Dielectrics (jointly with DF); Organic Thin Films; Nanoengineered Thin Films; Layer Deposition Processes; Layer Properties: Electrical, Optical, and Mechanical Properties; Thin Film Characterisation: Structure Analysis and Composition; Application of Thin Films

DS 42.114: Poster

Wednesday, March 16, 2011, 15:00–17:30, P1

Mueller matrix ellipsometry on large area split ring resonator arrays — •Bruno Gompf, Barbara Krausz, Bettina Frank, Harald Giessen, and Martin Dressel — Physikalisches Institut and Research Center SCOPE, Universität Stuttgart

The workhorse of the metamaterial community is the split ring resonator (SRR). It represents the top-down approach to tailored effective optical parameters in the sense that it is essentially a miniature inductive-capacitive resonant circuit. Arranging many of these nano-circuits, sometimes called photonic atoms, together, it is assumed that they merge into a material with effective optical parameters. The problem is that in general the optical response is k-dependent, only in the special case when the regular building blocks of a material (molecules, unit cells, nanostructures, etc.) are small compared to the wavelength, spatial dispersion can be neglected. Surprisingly the complete k-dependent optical response of SRR-arrays was not measured up to now. We present Mueller matrix spectroscopic ellipsometry on large area SRR arrays in transmission at various angles of incidence and azimuthal orientations in the energy range of 0.73 to 4.6eV. To visualize the experimental results, we plot the matrix elements in polar coordinates. From the off-diagonal elements, it becomes obvious that the SRR-array is birefringent, but with strongly k-dependent optical axes. Closed ring structures, fabricated in the same way, do not exhibit this behaviour. The results clearly show that the optical response of the SRR array cannot be described by purely dielectric effective parameters.