Berlin 2008 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 24: Photonic crystals II

HL 24.13: Vortrag

Dienstag, 26. Februar 2008, 12:45–13:00, EW 202

Analysis of metallic nanometer meander structures — •Heinz Schweizer — University Stuttgart, 4. Phys. Inst. Pfaffenwaldring 57, 70569 Stuttgart

Metallic meander structures can be regarded as basic building blocks for optical metamaterials as they show capacitive series impedance over a large bandwidth [1]. This impedance leads to a negative permeability in a homogeneous metamaterial. Meander structures are also advantageous as their impedance stays mostly isotropic with respect to the angle of incidence. We analyze the electromagnetic response on the basis of group theory and find the coupling regimes for E- and B- fields that are justified by angle-dependent optical measurements on single metamaterial layers. From optical transmission spectra we find under 20°rotation of the incident k-vector around the H-field direction only little change of the transmission spectra. The capacitive impedance spans a spectral region from 550 nm up to 665 nm. Interpreting the single layer as a thin sheet homogeneous material the impedance value corresponds to a maximum permeability value of - 4.5 at 650 nm.

[1] H. Schweizer et al., phys. stat. sol. (a) 204, 3886 (2007).