Berlin 2012 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 17: Plasmonic Systems

HL 17.3: Vortrag

Montag, 26. März 2012, 15:30–15:45, EW 203

Terahertz Metamaterials Based on Arrays of Rolled-Up Gold/(In)GaAs Tubes — •Andreas Rottler, Markus Bröll, Nils Gerken, Detlef Heitmann, and Stefan Mendach — Institute of Applied Physics, University of Hamburg, Germany

Metamaterials are artificial structures where permittivity and permeability can be designed on demand and may exhibit values which are not observed in nature. Recently it has been shown that three-dimensional metal/semiconductor microtube metamaterials with multiple rotations can be fabricated [1].

In this talk, we demonstrate with finite-integration technique simulations that arrays of rolled-up gold/(In)GaAs tubes with slightly more than one winding interact resonantly with the magnetic component of an incident electromagnetic field and exhibit a negative permeability at terahertz frequencies [2]. We show that the frequency interval of negative permeability can be tailored to desired values by changing the winding number. Additionally, we also demonstrate that this dependence can be removed, if desired, by the incorporation of an additional slit into the gold layer. In an experiment such a slit can be prepared by lithographic means prior to the rolling-up process.

We gratefully acknowledge support by the DFG via the Graduiertenkolleg 1286.

[1] S. Schwaiger et al., Phys. Rev. Lett. 102, 163903 (2009).

[2] A. Rottler et al., Opt. Lett. in press.